MetOp-SG MWI
Tipo Doc.:
Doc.Type:
REQUIREMENTS SPECIFICATION
N° Doc.:
Doc. N°:
MOS-RS-CGS-MWI-0006
Titolo:
Title :
RADIO FREQUENCY ASSEMBLY (RFA) SPECIFICATION
Nome &Funzione
Name & Function
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N° DRD:
DRD N°:
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2014.09.05
11:33:10 +02'00'
05/09/2014
X C. Cinquepalmi (CGS-
05/09/2014
F. Tominetti (CGS-PM)
05/09/2014
CC)
Esterna / External
ESA
1
Customer / Higher Level Contractor
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Gestionedocumenti:
Data Management:
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Firma / Signature
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05/09/2014
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authorized by:
1
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LISTA DI DISTRIBUZIONE
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MWI-IN-04a
Data / Date
File:
MWI-IN-04a_MOS-RS-CGS-MWI0006_v4_RFA Specification.docx
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X
MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0006
Ediz.:
Issue:
04
Pagina
Page
2
Data:
Date:
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75
REGISTRAZIONE DELLE MODIFICHE / CHANGE RECORD
EDIZIONE
ISSUE
DATA
DATE
01
3/12/2012
02
28/03/2013
AUTORIZZAZIONE
CHANGE AUTHORITY
OGGETTO DELLA MODIFICA E SEZIONI AFFETTE
REASON FOR CHANGE AND AFFECTED SECTIONS
First Issue
iSRR RIDs
-
03
30/04/2014
04
05.09.2014
RID #200:
1. Paragraph 8.1 updated (this specification is
considered at RF Assembly level)
2. Applicable Documents list (Errore. L'origine
riferimento non è stata trovata.) updated
3. Paragraph 5.4 : requirements R-RAD-RFA-1350-TA,
R-RAD-RFA-0230-TA, R-RAD-RFA-0231-TA
modified; requirement R-RAD-RFA-0232-TA added
Paragraph 5.5.3 : requirements R-ANT-RFA-0422-TA
and R-ANT-RFA-0500-TA modified; requirements RANT-RFA-0100-TR, R-ANT-RFA-0110-T and R-ANTRFA-0423-TA added
4. Paragraph 8.5 : requirement R-IFE-RFA-1035-T
(reference to EMC Control Plan) added
5. Paragraph 8.4.3 : IF of MWI-1 H and V specified
(value TBC)
6. Paragraph 5.6 : requirements R-THR-RFA-0010-R,
R-THR-RFA-0015-TR and R-THR-RFA-0020-TR
modified; requirements from R-THR-RFA-0050-R to
R-THR-RFA-0160-R added
Paragraph 8.3 : R-IFC-RFA-1020-A and R-IFC-RFA1030-A added
Paragraph 8.3.1 : requirement R-IFC-RFA-1005-R
added
Paragraph 8.3.2 : requirements R-IFC-RFA-1040-TR
and R-IFC-RFA-1050-TR added; requirement R-IFCRFA-0270-A deleted
Paragraph 8.3.3 : requirement R-IFC-RFA-0320-R
modified
Added paragraph 8.3.4 (requirements from R-IFCRFA-1060-R to R-IFC-RFA-1110-R)
7. Paragraph 5.3 : requirements R-DES-RFA-0140-R
and R-DES-RFA-0141-TR added; paragraph 8.4.2 :
requirement R-IFC-RFA-0360-R modified,
requirements R-IFC-RFA-0412-TR and R-IFC-RFA0414-TR added
8. Paragraph 5.3 : requirement R-DES-RFA-0150-TR
added (see also paragraph 8.4.2 requirement R-IFCRFA-0370-R)
RID #216: Paragraph 8.1 updated (this specification is
considered at RF Assembly level)
RID #243: Requirement R-RAD-RFA-0231-TA modified
(Paragraph 5.4 )
TBD removed in requirements R-DES-RFA-0060-TA and RDES-RFA-0127-T
All
General update for the MWI Bridging phase Final Review
All
Document Template Updated
Questo documento contiene informazioni di proprietà di CGS SpA, Airbus Defence and Space SAS e Space Engineering SpA. Tutti i diritti sono riservati
All information contained in this document is property of CGS SpA, Airbus Defence and Space SAS and Space Engineering SpA. All rights reserved
MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Doc N°:
MOS-RS-CGS-MWI-0006
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Issue:
04
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Questo documento contiene informazioni di proprietà di CGS SpA, Airbus Defence and Space SAS e Space Engineering SpA. Tutti i diritti sono riservati
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0006
Ediz.:
Issue:
04
Pagina
Page
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Data:
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TABLE OF CONTENTS
1.
INTRODUCTION AND SCOPE ............................................................................................................................ 8
2.
APPLICABLE AND REFERENCE DOCUMENTS .............................................................................................. 8
2.1
2.2
APPLICABLE DOCUMENTS ........................................................................................................................ 8
REFERENCE DOCUMENTS ........................................................................................................................ 9
3.
ACRONYMS ....................................................................................................................................................... 10
4.
MWI INSTRUMENT OVERVIEW ....................................................................................................................... 11
4.1
5.
RFA DESCRIPTION .................................................................................................................................... 12
TECHNICAL REQUIREMENTS ......................................................................................................................... 14
5.1
GENERAL RFA REQUIREMENTS ............................................................................................................. 14
5.2
RFA SPECTRAL PERFORMANCE REQUIREMENTS .............................................................................. 15
5.3
RECEIVER DESIGN REQUIREMENTS ..................................................................................................... 18
5.4
RFA RADIOMETRIC PERFORMANCE REQUIREMENTS ........................................................................ 19
5.5
RFA GEOMETRIC PERFORMANCE REQUIREMENTS ........................................................................... 23
5.5.1
COVERAGE REQUIREMENTS .................................................................................................................... 23
5.5.2
POINTING PERFORMANCE REQUIREMENTS ............................................................................................... 23
5.5.3
ANTENNA PERFORMANCE REQUIREMENTS ................................................................................................ 23
5.5.4
INTERNAL CALIBRATION REQUIREMENTS ................................................................................................... 28
5.6
THERMAL HARDWARE REQUIREMENTS ............................................................................................... 28
5.7
TELEMETRY REQUIREMENTS ................................................................................................................. 30
6.
RELIABILITY REQUIREMENTS ....................................................................................................................... 32
7.
OPERATIONAL REQUIREMENTS ................................................................................................................... 33
7.1
8.
LIFETIME .................................................................................................................................................... 33
INTERFACES REQUIREMENTS ....................................................................................................................... 34
8.1
MECHANICAL INTERFACES REQUIREMENTS ....................................................................................... 34
8.1.1
REFERENCE FRAMES .............................................................................................................................. 35
8.1.2
RFA DIMENSIONS AND MASS ................................................................................................................... 35
8.1.3
RFA DYNAMIC RANGE ............................................................................................................................. 35
8.2
INTERFACES DEFINITION ........................................................................................................................ 35
8.2.1
GENERAL INTERFACES ............................................................................................................................ 35
8.2.2
RFA INTERFACE WITH SCM .................................................................................................................... 36
8.2.3
RFA INTERFACE WITH CPDU AND FEE ................................................................................................... 37
8.2.4
RFA INTERFACE WITH LLD AND SCM PRELOADING GSE ......................................................................... 38
8.2.5
RFA INTERFACE WITH OFFLOADING AND HOISTING GSE ........................................................................... 40
8.2.6
BALANCING ............................................................................................................................................ 41
8.2.7
RFA FIELD OF VIEW ............................................................................................................................... 41
8.2.8
RFA INTERFACE WITH THE CALIBRATION ASSEMBLY ................................................................................ 44
8.3
THERMAL INTERFACES REQUIREMENTS ............................................................................................. 44
8.3.1
TEMPERATURE DEFINITION AND DISSIPATION ............................................................................................ 45
8.3.2
RECEIVERS AND FEED CLUSTER .............................................................................................................. 45
8.3.3
REFLECTOR THERMAL INTERFACES.......................................................................................................... 46
8.3.4
DECK THERMAL INTERFACES ................................................................................................................... 47
8.4
ELECTRICAL INTERFACES REQUIREMENTS ........................................................................................ 47
8.4.1
GENERAL ............................................................................................................................................... 47
8.4.2
FEE INTERFACES ................................................................................................................................... 48
8.4.3
CDPU INTERFACE .................................................................................................................................. 49
8.5
EMC REQUIREMENTS............................................................................................................................... 50
8.5.1
BONDING AND GROUNDING ...................................................................................................................... 51
8.5.2
CABLE AND HARNESS REQUIREMENTS...................................................................................................... 52
8.5.3
CIRCUITS REQUIREMENTS ....................................................................................................................... 53
Questo documento contiene informazioni di proprietà di CGS SpA, Airbus Defence and Space SAS e Space Engineering SpA. Tutti i diritti sono riservati
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
8.5.4
9.
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STATIC CHARGING ................................................................................................................................... 53
GENERAL DESIGN AND INTERFACE REQUIREMENTS ............................................................................... 55
9.1
GENERAL DESIGN REQUIREMENTS ....................................................................................................... 55
9.1.1
LIFETIME ................................................................................................................................................. 55
9.1.2
DESIGN SAFETY ...................................................................................................................................... 55
9.1.3
DEPENDABILITY AND SAFETY ................................................................................................................... 55
9.1.4
VENTING ................................................................................................................................................. 55
9.1.5
IDENTIFICATION & MARKING ..................................................................................................................... 55
9.1.6
ACCESSIBILITY/MAINTAINABILITY .............................................................................................................. 56
9.1.7
TRANSPORTATION, HANDLING AND STORAGE ........................................................................................... 56
9.1.7.1
Transport ....................................................................................................................................... 56
9.1.7.2
Unit packing ................................................................................................................................... 56
9.1.7.3
Container identification .................................................................................................................. 57
9.1.7.4
Handling ......................................................................................................................................... 57
9.1.7.5
Seals .............................................................................................................................................. 57
9.1.7.6
Lubricants and Sealants ................................................................................................................ 57
9.1.7.7
Screw Locking ............................................................................................................................... 57
9.1.7.8
Ground Support Equipment ........................................................................................................... 57
9.2
MECHANICAL DESIGN AND CONSTRUCTION REQUIREMENTS .......................................................... 57
9.2.1
GENERAL REQUIREMENT.......................................................................................................................... 57
9.2.2
YELD AND ULTIMATE LOADS...................................................................................................................... 58
9.2.3
MARGINS OF SAFETY ............................................................................................................................... 58
9.2.4
QUASI-STATIC DESIGN LOAD.................................................................................................................... 58
9.3
ELECTRICAL DESIGN AND CONSTRUCTION REQUIREMENTS ........................................................... 58
9.3.1
CONNECTORS GENERAL DESIGN REQUIREMENTS ..................................................................................... 58
9.3.1.1
Harness.......................................................................................................................................... 58
9.3.1.2
Connector Types ........................................................................................................................... 59
9.3.2
BONDING ................................................................................................................................................ 59
9.4
THERMAL DESIGN AND CONSTRUCTION REQUIREMENTS ................................................................ 60
10.
ENVIRONMENT REQUIREMENTS ................................................................................................................ 61
10.1
GENERAL................................................................................................................................................. 61
10.2
GROUND ENVIRONMENT ...................................................................................................................... 61
10.2.1 GROUND HANDLING, TRANSPORTATION AND STORAGE............................................................................... 62
10.2.2 VERIFICATION AND TESTING ..................................................................................................................... 62
10.3
LAUNCH ENVIRONMENT ....................................................................................................................... 63
10.4
SPACE ENVIRONMENT .......................................................................................................................... 63
10.4.1 VACUUM ................................................................................................................................................. 63
10.4.2 ENVIRONMENTAL TEST............................................................................................................................. 63
10.4.3 NATURAL ELECTROMAGNETIC RADIATION AND INDICES .............................................................................. 66
10.4.4 NEUTRAL ATMOSPHERE ........................................................................................................................... 66
10.4.5 PLASMA .................................................................................................................................................. 66
10.4.6 ENERGETIC PARTICLE RADIATION ............................................................................................................. 66
10.4.7 SPACE DEBRIS AND METEOROIDS ............................................................................................................ 66
10.4.8 ATOMIC OXYGEN ..................................................................................................................................... 66
11.
ASSEMBLY, INTEGRATION AND VERIFICATION REQUIREMENTS ........................................................ 68
11.1
GENERAL................................................................................................................................................. 68
11.2
ASSEMBLY AND INTEGRATION ............................................................................................................ 68
11.3
VERIFICATION REQUIREMENTS .......................................................................................................... 68
11.4
CALIBRATION .......................................................................................................................................... 70
11.5
GROUND SUPPORT EQUIPMENT ......................................................................................................... 70
11.5.1 EGSE .................................................................................................................................................... 71
11.5.2 MGSE .................................................................................................................................................... 71
11.5.3 FACILITIES .............................................................................................................................................. 71
Questo documento contiene informazioni di proprietà di CGS SpA, Airbus Defence and Space SAS e Space Engineering SpA. Tutti i diritti sono riservati
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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LIST OF FIGURES
Figure 3-1 Conical scanning principle ........................................................................................................................ 11
Figure 3-2 MWI block diagr ........................................................................................................................................ 12
Figure 4-3: RFA tree .................................................................................................................................................. 12
Figure 5-1: RFA Filters mask ..................................................................................................................................... 16
Figure 5-2: MWI polarisation Vectors ........................................................................................................................ 26
Figure 8-1: MWI mechanical architecture overview ................................................................................................... 34
Figure 8-2: RFA interfaces (in launch and operational configuration) ....................................................................... 36
Figure 8-3: Locations of interfaces with LLD and SCM preloading GSE ................................................................... 38
Figure 8-4: Mechanical interface with LLD and SCM preloading GSE ...................................................................... 39
Figure 8-5: Locations of interfaces with offloading and hoisting GSE ....................................................................... 40
Figure 8-6: Earth acquisition field of view .................................................................................................................. 42
Figure 8-7: Cold calibration field of view .................................................................................................................... 43
Figure 8-8: Hot calibration field of view ...................................................................................................................... 43
Figure 8-9: MWI Thermal design concept with platform shadowing .......................................................................... 44
Figure 8-10: Command data link interface diagram .................................................................................................. 49
Figure 8-11: RFA LO power command data link scheme .......................................................................................... 49
Figure 10-1: Acoustic Vibrations Qualification Spectrum .......................................................................................... 65
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0006
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LIST OF TABLES
Table 5-1: MWI Channels ........................................................................................................................................... 14
Table 5-2: RFA Channels frequency stability ............................................................................................................. 16
Table 5-3: RFA input protection filter requirement for MWI-1/MWI-2/MWI-3 channels .............................................. 17
Table 5-4: RFA Earth scene dynamic range requirements. ....................................................................................... 20
Table 5-5: RFA Channel noise figure requirements ................................................................................................... 21
Table 5-6: Channels integration time requirements ................................................................................................... 22
Table 5-7: Spillover requirements ............................................................................................................................... 25
Table 5-8: Energy in the sidelobes requirements ....................................................................................................... 25
Table 5-9: RFA channel polarisation .......................................................................................................................... 26
Table 5-10: RFA channel cross-polarisation requirement .......................................................................................... 27
Table 8-1: Interface with SCM .................................................................................................................................... 37
Table 8-2: Description of LLD and SCM preloading GSE interfaces with RFA .......................................................... 39
Table 8-3: Description of offloading and hoisting GSE interfaces with RFA .............................................................. 41
Table 8-4: Load factors for hoisting ............................................................................................................................ 41
Table 8-5: Earth acquisition field of view [TBC] .......................................................................................................... 42
Table 8-6: Cold calibration field of view [TBC]............................................................................................................ 43
Table 8-7: Hot calibration field of view [TBC] ............................................................................................................. 44
Table 8-8: Qualification temperatures ........................................................................................................................ 45
Table 8-9: FEE Power supply rail characteristics ....................................................................................................... 48
Table 8-10: Max current consumption of the power supply rails ................................................................................ 49
Table 8-11: RFA-CDPU electrical interfaces .............................................................................................................. 50
Table 8-12: MetOp-SG on board transmitters RF emission characteristics ............................................................... 50
Table 8-13: Characteristics of TT&C, ARGOS-DCS and SCA on board transmitters................................................ 51
Table 8-14: Cables EMC classification ....................................................................................................................... 53
Table 10-1: On Ground Operations Environment ....................................................................................................... 61
Table 10-2: On Ground Operations and Handling Loads ........................................................................................... 62
Table 10-3: Sine Vibration Qualification Spectrum applicable to RFA ....................................................................... 64
Table 10-4: Random Vibration Qualification Spectrum applicable to RFA ................................................................. 64
Table 10-5: Shock qualification loads ......................................................................................................................... 65
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0006
Ediz.:
Issue:
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Data:
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1. INTRODUCTION AND SCOPE
This document defines the technical specifications of Calibration Assembly (CA) of MWI Instrument. This document
defines all the interface requirements between the CA and the other constituting parts of the instrument and the
MetOp-SG platform.
Further to the specific requirements contained in this document, MetOp-SG equipment are subject to the common
design, interface, environment and test requirements included in General Design and Interface Requirements
(GDIR specification). GDIR document specifies contractually relevant requirements as well as assumptions and
constraints, which also apply to the development, design, manufacturing, assembly, verification and delivery of any
MetOp-SG equipment to the extent specified in this FEE specification.
In case of conflicts, this specification supersedes - within the scope of the conflict only - GDIR content; the conflict
shall anyhow be reported to the Contractor for proper resolution.
2. APPLICABLE AND REFERENCE DOCUMENTS
2.1
APPLICABLE DOCUMENTS
AD
Doc. No.
Issue/
Rev.
Title
AD04
MOS-SOW-ADS-SATB-0579
1.1
Statement Of Work for the MicroWave Imager [SOWMWI]
AD09
MOS-SP-ADS-SATB-0580
1.4
Technical Requirements Specification for the MicroWave
Imager Instrument [TRS-MWI]
AD13a
MOS-SP-ASF-SYS-00816
1.1
MetOp-SG Instrument General Design and Interface
Requirements [INS-GDIR]
AD13b
MOS-SP-ASF-SYS-00349
2.2
MetOp-SG Units General Design and Interface
Requirements [Units GDIR]
AD13c
ENS-06-00123-ASTR
8.0
General Design and Interfaces Requirements [Generic
GDIR]
AD14
MOS-RS-ESA-INS-0434
1.0
MetOp-SG Instruments Product Assurance and Safety
Requirements [PARD]
AD14b
MOS-SP-ASF-SYS-00401
1.0
MetOp-SG Product Assurance Requirements for
Suppliers
AD14c
MOS-SP-ASF-SYS-00402
1.0
MetOp-SG Software Product Assurance Requirements for
Suppliers
AD15
MOS-RS-ESA-INS-0435
1.0
MetOp-SG Instruments Project Management
Requirements [MARD]
AD16
MOS-LI-ESA-SYS-0067
1.1
MetOp-SG Deliverable Items and Services List [DISL]
AD17
MOS-LI-ESA-INS-0436
1.0
MetOp-SG Instruments Document Requirements List
[DRL]
AD18
MOS-LI-ESA-INS-0437
1.0
MetOp-SG Instruments Document Requirements
Definition [DRD]
AD19
MOS-RS-ESA-INS-0438
1.0
MetOp-SG Instruments Tailoring Of ECSS-E Standards
AD20
MOS-PL-CGS-MWI-0014
01
MWI EMC Control Plan
AD21
MOS-TN-CGS-MWI-0003
03
MWI Instrument Reference Coordinate System
AD22
MOS-RS-CGS-MWI-0013
01
MWI Instrument Thermal Requirements
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
AD
Doc. No.
Issue/
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Doc N°:
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Title
Rev.
MOS-PL-ADS-MWI-0002
1
AD24
AD25
MOS-PL-CGS-MWI-0006
MOS-PL-CGS-MWI-0015
5
1
Instrument Characterization and Performance Verification
Plan
Instrument Design, Development and Verification Plan
Instrument Assembly, Integration and Test Plan
AD26
MOS-PL-ADS-MWI-0001
01
Instrument Calibration Plan
AD23
Remark:
[AD13b] is often recalled in this document as source for a requirement, In such case, all requirements of
relevant [AD13b] paragraph constitute integral part of this specification and must be intended as
applied to FEE (including their original numbering and verification method).
2.2
REFERENCE DOCUMENTS
RD
Doc. No.
Issue/
Rev.
Title
RD01
MOS-LI-CGS-MWI-0001
01
List of acronyms and abbreviations
RD02
MOS-TN-CGS-MWI-0007
01
IRS Requirements Analysis
RD03
MOS-TN-CGS-MWI-0008
01
GDIR Requirements Analysis
RD04
IEEE Trans. Geosci. Remote
Sens., 44(3), 2006
-
Ruf, C., S.M. Gross, S. Misra, “RFI detection and
mitigation for microwave radiometry with an agile digital
detector”
RD05
ECSS-E-ST-10-04C
11/08
Space environment
RD06
ECSS-E-ST-10-02C
3/09
Verification
RD07
ECSS-E-ST-03A
2/02
Testing
RD08
ECSS-E-ST-20-07C
7/08
Electromagnetic Compatibility
RD09
ECSS-E-ST-50-14C
7/08
Spacecraft discrete interfaces
RD10
ECSS-E-ST-32-10C
1
Structural factors of safety for spaceflight hardware
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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3. ACRONYMS
Please refer to [RD01]
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SPECIFICATION
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4. MWI INSTRUMENT OVERVIEW
The MicroWave Imager (MWI) Instrument is part of the payload complement of the MetOp-SG Satellites type B.
MWI is a conical scanning radiometer, with multiple frequency channels covering the frequency range from 18.7
GHz to 183.3 GHz.
The instrument rotates at constant speed, and collects the microwave radiation from the Earth surface and
atmosphere at several IFOV positions at each rotation, in an angular sector of ±65 degrees. At each rotation of the
instrument, a line of the microwave-image is formed. As the satellite moves forward along the orbit, the on-ground
track of the scanning, the image of the atmosphere is formed by the succeeding IFOV lines.
The spatial resolution (dimension of the IFOV) ranges from 50 km at 18.7GHz to 10 km for the highest frequency
channels.
The MicroWave Imager will provide precipitation monitoring as well as sea ice extent information.
Figure 4-1 Conical scanning principle
The microwave radiation from the scene is collected by the antenna reflector and focused to the respective horns.
The scene is scanned by rotation of the complete antenna i.e. the reflector and the horns. Every rotation, the
angular sector where the antenna beam looks at the platform is used to calibrate the receivers. A calibration mirror
is used to collect the energy coming from the cold sky. An on board hot target allows to have another calibration
point. These elements constitute the Calibration Assembly (CA).
The required radiometric sensitivity needs to have the receivers close to the horns and so they are implemented in
the rotating part. The purpose of the receivers is to deliver signals, the magnitude of which is proportional to the
brightness temperature of the scene. A rotating joint (PDTD) allows the transfer of the electrical signals (video,
TM/TC, power supplies, heater lines) between the fixed part and the rotating part.
The rest of the instrument is constituted by a scan mechanism (SCE and SCM) which insures the antenna and
Back-End assembly rotation, an Instrument Control Unit (ICU), a Control Data Processing Unit (CDPU) and a FEE
(Front End Electronics).
The RF receivers are located in the rotating part of the instrument that includes also the feed cluster, the main dish
and two electronics units: the CDPU and the FEE.
The block diagram of the MWI Instrument including the electrical interfaces is shown in the following figure.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Temperature sensors
for thermal control
Rotating part
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Fixed part
Calibration Assembly CA
Radio Frequency
Assembly RFA
Front-End Sub
Assembly FESA
Feed Cluster
Front End
Receivers
OMT+
Input
filter
Low Frequency
Equipment
Integrated Receivers
SH RX 18.7 GHz
SH RX 18.7 GHz
Cold Sky
Reflector
Thermal Acquisition
Module
(3x redundancy)
RFI Mitigation
Module
Temperature sensors
RX 23.8 GHz
18.7/23.8
GHz
ICU Power
Instrument Control Unit
ICU
Nom & Red
RX 23.8 GHz
RX 31.4 GHz
OMT+
Input
filter
31.4 GHz
On Board
Calibration
Target
CDPU Power
Eq. Switch Off Lines,
ON/OFF TC
Observation Data
& TM/TC
RX 31.4 GHz
Back End (BE)
OMT
50/54 GHz
DoCon 50/54 GHz
Nominal section
Main
Reflector
BE 50/54 GHz
RX 89 GHz
OMT
Focal point
89 GHz
Scan
Mechanism
Sub-Assembly
BE 50/54 GHz
RX 89 GHz
DoCon 118 GHz
BE 118 GHz
DoCon 165 GHz
BE 165 GHz
DoCon 183 GHz
BE 183 GHz
Redundant section
DoCon 50/54 GHz
118 GHz
PDTD
Survival Temperature sensors
Survival Heaters Power
(rotating part)
ON/OFF
TC
Scan
Mechanism
Encoder Data
Motor Phases
165 GHz
183 GHz
Receivers Temp. Sensors
Control & Data
Processing Unit
CDPU
Front End Electronics FEE
Heaters power
(operational mode)
Temperature
Sensors for
survival mode
Heaters
(survival mode)
Scan Control
Electronics
SCE
Nom & Red
Launch Lock Devices
LLD (x3)
Temperature Sensors for survival mode
Heaters for survival mode
Scan Mechanism Power
Data handling
LLD Activation
Survival Temperature sensors
Survival Heaters Power
(Fixed part)
Video line
Power - Secondary supply
Serial link
Discrete Commands
Synchronisation
Power - Primary supply
Observation Data / Data handling (SpaceWire)
Temperature sensors
Figure 4-2 MWI block diagr
4.1
RFA DESCRIPTION
The RF Assembly is composed by the main elements shown in the following figure, according to the MWI
instrument product tree:
Figure 4-3: RFA tree
The RF Assembly is mounted on the rotating part of the instrument. It is constituted of a parabola with a set of
horns located at the reflector focal point. Behind each horn, receivers deliver analogue signals, the magnitude of
which is proportional to the temperature signal at the antenna. A set of telecommands allows optimizing the
channel gain and offsetting as required by the user. Thermistors located on the critical sub-equipment allow the
temperature monitoring. A set of regulated voltage lines supplies the receivers. All assemblies including the
antenna reflector are mounted on a rigid structure, which insures the required mechanical and thermal stability.
The RFA sub-equipment are:

Antenna: Main reflector and feed cluster (including horns, OMT and HF Frontend),
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION



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Receivers: direct detection receivers, heterodyne receivers, down-converters, back-ends,
Thermal and mechanical hardware
Electrical and RF Harness.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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5. TECHNICAL REQUIREMENTS
5.1
GENERAL RFA REQUIREMENTS
R-GEN-RFA-0080-R
RFA is composed of 26 receivers channels defined as follows:
Channel name
Frequency (GHz)
Bandwidth
(MHz)
Polarisation
MWI-1
18.7
200
H&V
MWI-2
23.8
400
H&V
MWI-3
31.4
200
H&V
MWI-4
50.3
400
H&V
MWI-5
52.61
400
H&V
MWI-6
53.24
400
H&V
MWI-7
53.75
400
H&V
MWI-8
89
4000
H&V
MWI-9
118.7503±3.2
2x 500
V
MWI-10
118.7503±2.1
2x 400
V
MWI-11
118.7503±1.4
2x 400
V
MWI-12
118.7503±1.2
2x 400
V
MWI-13
165.5±0.725
2x 1350
V
MWI-14
183.31±7.0
2x 2000
V
MWI-15
183.31±6.1
2x 1500
V
MWI-16
183.31±4.9
2x 1500
V
MWI-17
183.31±3.4
2x 1500
V
MWI-18
183.31±2.0
2x 1500
V
Table 5-1: MWI Channels
Derived From IRS_R-MWI-0080-R
R-GEN-RFA-1050-R
RFA shall have a single main antenna.
Derived From IRS_R-MWI-1050-R
R-GEN-RFA-1060-R
RFA main antenna shall be fixed and shall not require deployment mechanism.
Derived From IRS_R-MWI-1060-R
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-GEN-RFA-1210-AR
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The RFA shall include a sun shield against the sun intrusion into the instrument,
minimizing the openings other than those needed for the instrument operation (i.e.
earth view and cold sky view)
Derived From IRS_R-MWI-1210-R
R-GEN-RFA-1220-R
All RFA feed horns shall include a dust cap in order to protect receiver HW from dust and
particles. These dust caps shall be identified as “Remove Before Flight”.
Derived From IRS_R-MWI-1220-R
R-GEN-RFA-1230-R
The ADC function, data collection and transmission to the fixed part of MWI shall not be
included in RFA and shall be realized in CDPU.
Derived From IRS_R-MWI-1230-R
5.2
RFA SPECTRAL PERFORMANCE REQUIREMENTS
R-SPC-RFA-0130-T
nd
RFA channel center operating frequencies shall be according to 2 column of
Bandwidth
Channel name
Frequency (GHz)
Polarisation
(MHz)
MWI-1
18.7
200
H&V
MWI-2
23.8
400
H&V
MWI-3
31.4
200
H&V
MWI-4
50.3
400
H&V
MWI-5
52.61
400
H&V
MWI-6
53.24
400
H&V
MWI-7
53.75
400
H&V
MWI-8
89
4000
H&V
MWI-9
118.7503±3.2
2x 500
V
MWI-10
118.7503±2.1
2x 400
V
MWI-11
118.7503±1.4
2x 400
V
MWI-12
118.7503±1.2
2x 400
V
MWI-13
165.5±0.725
2x 1350
V
MWI-14
183.31±7.0
2x 2000
V
MWI-15
183.31±6.1
2x 1500
V
MWI-16
183.31±4.9
2x 1500
V
MWI-17
183.31±3.4
2x 1500
V
MWI-18
183.31±2.0
2x 1500
V
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
Table 5-1.
R-SPC-RFA-0140-T
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Derived From IRS_R-MWI-0130-T
RFA channel bandwidths shall be according to 3rd column of
Bandwidth
Channel name
Frequency (GHz)
Polarisation
(MHz)
MWI-1
18.7
200
H&V
MWI-2
23.8
400
H&V
MWI-3
31.4
200
H&V
MWI-4
50.3
400
H&V
MWI-5
52.61
400
H&V
MWI-6
53.24
400
H&V
MWI-7
53.75
400
H&V
MWI-8
89
4000
H&V
MWI-9
118.7503±3.2
2x 500
V
MWI-10
118.7503±2.1
2x 400
V
MWI-11
118.7503±1.4
2x 400
V
MWI-12
118.7503±1.2
2x 400
V
MWI-13
165.5±0.725
2x 1350
V
MWI-14
183.31±7.0
2x 2000
V
MWI-15
183.31±6.1
2x 1500
V
MWI-16
183.31±4.9
2x 1500
V
MWI-17
183.31±3.4
2x 1500
V
MWI-18
183.31±2.0
2x 1500
V
Bandwidth
(MHz)
Polarisation
Table 5-1.
Note: Channel bandwidths given in 3rd column of
Channel name
Frequency (GHz)
MWI-1
18.7
200
H&V
MWI-2
23.8
400
H&V
MWI-3
31.4
200
H&V
MWI-4
50.3
400
H&V
MWI-5
52.61
400
H&V
MWI-6
53.24
400
H&V
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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MWI-7
53.75
400
H&V
MWI-8
89
4000
H&V
MWI-9
118.7503±3.2
2x 500
V
MWI-10
118.7503±2.1
2x 400
V
MWI-11
118.7503±1.4
2x 400
V
MWI-12
118.7503±1.2
2x 400
V
MWI-13
165.5±0.725
2x 1350
V
MWI-14
183.31±7.0
2x 2000
V
MWI-15
183.31±6.1
2x 1500
V
MWI-16
183.31±4.9
2x 1500
V
MWI-17
183.31±3.4
2x 1500
V
MWI-18
183.31±2.0
2x 1500
V
05/09/2014
75
Table 5-1 are maximum acceptable half-power bandwidths (except for MWI-1, MWI-2 and
MWI-3, where channels bandwidths are -20dB-power bandwidths), assuming absolutely
stable frequency response.
Derived From IRS_R-MWI-0140-T
rd
R-SPC-RFA-0150-TA RFA center frequency stability shall be according to 3 column of Table 5-2
Note: Frequency stability represents the maximum deviations authorised from the specified
nominal frequency during lifetime. This performance shall include initial settings,
environmental variations (temperature, voltage, radiation effects…) and on ground and on
board ageing
Channel
Frequency [GHz]
Stability
[+/- MHz]
MWI-1
18.7
50
MWI-2
23.8
50
MWI-3
31.4
50
MWI-4
50.3
10
MWI-5
52.61
5
MWI-6
53.24
5
MWI-7
53.75
5
MWI-8
89
100
MWI-9
118.7503±3.2
15
MWI-10
118.7503±2.1
15
MWI-11
118.7503±1.4
15
MWI-12
118.7503±1.2
15
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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MWI-13
165.5±0.725
100
MWI-14
183.31±7.0
70
MWI-15
183.31±6.1
70
MWI-16
183.31±4.9
70
MWI-17
183.31±3.4
70
MWI-18
183.31±2.0
30
05/09/2014
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Table 5-2: RFA Channels frequency stability
Derived From IRS_R-MWI-0150-TA
R-SPC-RFA-0200-TA The peak-to-peak “ripples” within the half-power bandwidth shall be less than 1.5 dB for at
least 80 % of the center portion of the half-power bandwidth and less than 3 dB for the
remaining 20 %, as shown in Figure 5-1.
Derived From IRS_R-MWI-0200-TA
R-SPC-RFA-0210-TA MWI out-of-band rejection for channels MWI-4 to MWI-18 shall be >3 dB, for all
frequencies outside 0.5 times the maximum acceptable half-power bandwidths, > 30 dB at
the band center value for all frequencies outside of 0.65 times the maximum acceptable
half power bandwidths and >40dB for all frequencies 0.75 times the maximum acceptable
half-power bandwidths as shown in Figure 5-1.
Note: Specified maximum acceptable half-power bandwidths are reported
in Table 5-1.
Figure 5-1: RFA Filters mask
Derived From IRS_R-MWI-0210-TA
R-SPC-RFA-0211-TA
MWI out-of-band rejection for channels MWI-1, MWI-2 and MWI-3 shall be >20dB for all
frequencies outside 0.5 times the maximum acceptable -20dB-power bandwidths, shall be
> 30 dB for all frequencies outside of 0.65 times the maximum acceptable -20dB-power
bandwidths and >40dB for all frequencies 0.75 times the maximum acceptable -20dB-
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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power bandwidths and >100dB for all frequencies 1.0 times the maximum acceptable 20dB-power bandwidths.
Note: Specified maximum acceptable -20dB-power bandwidths for MWI-1, MWI-2 and MWI-3 are reported in Table
5-1.
Derived From IRS_R-MWI-0211-R
R-SPC-RFA-1240-TA RFA out-of-band rejection at the input of the receiver LNA/mixer for channels MWI-1, MWI2 and MWI-3 shall be according to Table 5-3.
MWI-1
(18.7 GHz)
Frequency
[GHz]
<17
Minimum
Attenuation
[dB]
-40
17
MWI-2
(23.8 GHz)
Frequency
[GHz]
<22
Minimum
Attenuation
[dB]
-40
-40
22
17.2
-30
17.4
MWI-3
(31.4 GHz)
Frequency
[GHz]
<30
Minimum
Attenuation
[dB]
-40
-40
30
-40
22.2
-30
30.2
-30
-30
22.4
-30
30.4
-30
17.6
-30
22.6
-20
30.6
-20
17.8
-20
22.8
-20
30.8
-10
18
-20
23
-10
31
-10
18.2
-10
23.2
-10
31.2
0
18.4
0
23.4
0
31.4
0
18.6
0
23.6
0
31.6
0
18.8
0
23.8
0
31.8
-10
19
0
24
0
32
-10
19.2
-10
24.2
0
32.2
-20
19.4
-20
24.4
-10
32.4
-20
19.6
-20
24.6
-10
32.6
-30
19.8
-30
24.8
-20
32.8
-30
20
-40
25
-30
33
-30
20 - 36
-40
25-36
-40
33.2
-40
>36
-20
>36
-20
33.2-36
-40
>36
-20
Table 5-3: RFA input protection filter requirement for MWI-1/MWI-2/MWI-3 channels
Note: The input filtering is required in order to protect the first active components of the receiver
from damage from high power transmitters, both on-ground and on-board the S/C. The filtering of
the input waveguide due cut-off frequency may also be included as a part in the complete input
filter.
Derived From IRS_R-MWI-1240-TA
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-SPC-RFA-1250-TA RFA out of band rejection shall be designed to be compatible with SAT-B on-board
transmitters, according to GDIR [AD3].
Derived From IRS_R-MWI-1250-TA
R-SPC-RFA-0171-TA RFA channel response knowledge shall be from 1 MHz up to 3
channel.
RD
harmonic of each
Derived From IRS_R-MWI-0171-TA
R-SPC-RFA-0160-T
RFA channels shape knowledge shall be < 0.1 dB until channel response is down to -40dB
relative to channel max response.
Derived From IRS_R-MWI-0160-TA
R-SPC-RFA-1270-TA RFA channels shape knowledge shall be < 0.5dB where channel response is lower than 40dB.
Derived From IRS_R-MWI-1270-TA
R-SPC-RFA-0170-T
Each RFA channel shape resolution knowledge shall be bandwidth/100 as a minimum until
channel response is down to -40dB relative to channel max response.
Note: For this purpose, bandwidth refers to channel bandwidth or sub-channel bandwidth
depending on the channel. (As an example channel having bandwidth defined as 2 times
1500 MHz channel has 1500 MHz bandwidth).
Derived From IRS_R-MWI-0170-T
R-SPC-RFA-1280-TA Each RFA channel shape resolution knowledge shall be bandwidth/10 as a minimum
where channel response is lower than -40bB.
Derived From IRS_R-MWI-1280-TA
R-SPC-RFA-0180-TR RFA Double SideBand (DSB) channels can be implemented as Single SideBand (SSB)
channels if performance can be retained.
Derived From IRS_R-MWI-0180-TR
R-SPC-RFA-0190-T
For channels with two pass-bands, pass-bands shall have equal average system gain over
the pass-band bandwidth within ±1 dB.
Note: This requirement refers to RF pass-bands (Mixer sideband imbalance) in case of
double sideband receiver. Requirement applies to average system gain.
Derived From IRS_R-MWI-0190-TA
5.3
RECEIVER DESIGN REQUIREMENTS
R-DES-RFA-0005-TAR
For each channel the output voltage shall be in the range [-2.5V, +2.5V] [TBC]
under all circumstances (scene or calibration temperature, equipment temperature,
aging). The output voltage shall be differential.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-DES-RFA-0010-TAR For each channel, the output video filter shall have a 3 dB cut-off of 2.5 KHz [TBC].
R-DES-RFA-0020-R
For each channel, the output video filter shall be a first order filter.
R-DES-RFA-0110-TA The mean O/P of any channel shall not vary by more than than 0.015% [TBC] (equivalent
to 0.05K) due to any form of crosstalk.
Note: The cross-talk is a contributor of the MWI instrument radiometric accuracy
Derived From IRS_R-MWI-0240-TA, and IRS_R-MWI-0290
R-DES-RFA-0126-R
For channel MWI-1, heterodyne receiver shall be used.
R-DES-RFA-0127-T
The IF frequency of the heterodyne receiver for channel MWI-1 shall be 1.375 GHz. [TBC]
Note: The supplier can select a fundamental or sub-harmonic mixer for the channel MWI-1
R-DES-RFA-0128-R
A RFI coupled output just before the detector shall be included in the MWI-1 receiver.
Note: A RFI mitigation processing board will be included in the CDPU
R-DES-RFA-0129-TA The power level of the RFI coupled output for the MWI-1 receiver shall be in the range of 30 dBm to -20dBm [TBC] when measuring 335K scene temperature, plus the noise diode
temp. (See section 5.5.4 )
R-DES-RFA-0140-R
For all heterodyne receivers, an LO power control shall be implemented.
R-DES-RFA-0141-TR The LO power shall be controlled by 2 SDBL discrete telecommands.
R-DES-RFA-0150-TR Each Back End unit in the RFA shall provide separated power supply lines in order to allow
independent switch on/off of each channel.
Derived From IRS_R-MWI-1550
5.4
RFA RADIOMETRIC PERFORMANCE REQUIREMENTS
R-RAD-RFA-0220-T
The RFA earth scene dynamic range shall be according to the following table.
Channel
Frequency [GHz]
Lower End of Dynamic
Range [K]
Upper End of Dynamic
Range [K]
MWI-1
18.7
80
335
MWI-2
23.8
80
335
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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MWI-3
31.4
80
335
MWI-4
50.3
100
320
MWI-5
52.61
100
320
MWI-6
53.24
100
320
MWI-7
53.75
100
320
MWI-8
89
80
335
MWI-9
118.7503±3.2
80
320
MWI-10
118.7503±2.1
80
320
MWI-11
118.7503±1.4
80
320
MWI-12
118.7503±1.2
80
320
MWI-13
165.5±0.725
80
335
MWI-14
183.31±7.0
80
320
MWI-15
183.31±6.1
80
320
MWI-16
183.31±4.9
80
320
MWI-17
183.31±3.4
80
320
MWI-18
183.31±2.0
80
320
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75
Table 5-4: RFA Earth scene dynamic range requirements.
Derived From IRS_R-MWI-0220-T
RFA dynamic range shall be from cold sky temperature (2.7 K) up to highest scene
temperature and highest calibration temperature
Derived From IRS_R-MWI-1350-TA
R-RAD-RFA-1350-TA
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-RAD-RFA-0230-TA
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The RFA channel noise figure including losses before the receivers shall be
according to Table 5-5.
Note : This noise figure requirement is one parameter of the instrument Ne T
performance
Derived From IRS_R-MWI-0230-TA
Channel
Frequency [GHz]
Noise Figure [dB]
MWI-1
18.7
3.9
MWI-2
23.8
4.5
MWI-3
31.4
3.2
MWI-4
50.3
4
MWI-5
52.61
4
MWI-6
53.24
4
MWI-7
53.75
4
MWI-8
89
7.3
MWI-9
118.7503±3.2
4.7
MWI-10
118.7503±2.1
4.3
MWI-11
118.7503±1.4
4.3
MWI-12
118.7503±1.2
4.3
MWI-13
165.5±0.725
5.5
MWI-14
183.31±7.0
5.8
MWI-15
183.31±6.1
5.6
MWI-16
183.31±4.9
5.6
MWI-17
183.31±3.4
5.6
MWI-18
183.31±2.0
6.0
Table 5-5: RFA Channel noise figure requirements
-9
R-RAD-RFA-0231-TA The short term and mid term gain stability shall be better than 30•10
integration time in the range [1ms...10000 ms] for all channels.
[TBC] for an
Note : this STGS requirement is one parameter of the instrument NeT performance
Derived From IRS_R-MWI-0230-TA
R-RAD-RFA-0232-TA
Deleted
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-RAD-RFA-0233-TA
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The integration time of each channel shall be higher than:
Channel
Frequency [GHz]
Integration time [ms]
MWI-1
18.7
8.4
MWI-2
23.8
8.1
MWI-3
31.4
5.1
MWI-4
50.3
4.1
MWI-5
52.61
4.1
MWI-6
53.24
4.1
MWI-7
53.75
4.1
MWI-8
89
1.8
MWI-9
118.7503±3.2
1.6
MWI-10
118.7503±2.1
1.6
MWI-11
118.7503±1.4
1.6
MWI-12
118.7503±1.2
1.6
MWI-13
165.5±0.725
1.2
MWI-14
183.31±7.0
1.2
MWI-15
183.31±6.1
1.2
MWI-16
183.31±4.9
1.2
MWI-17
183.31±3.4
1.2
MWI-18
183.31±2.0
1.2
Table 5-6: Channels integration time requirements
Note: Integration time is the time required for the instrument to conically scan across the Footprint ellipse at 45 rpm
Derived From R- PRF-ANT-0090-AR of [AD09]
R-RAD-RFA-0250-TAR
The output voltage of each channel shall be linear with respect to the input antenna
temperature.
R-RAD-RFA-0251-TAR
The relative discrepancy between the "ideal" response and the actual response
must be less than +/-0.05 %, the “ideal” response being defined by the output
voltage measured for the cold and the hot calibration temperatures. This
specification shall be met over the temperature performance range and during the
instrument lifetime.
Note: This linearity requirement is one parameter of the instrument radiometric
accuracies.
Derived From IRS_R-MWI-0240-TA, IRS_R-MWI-0270-TA, IRS_R-MWI-0290
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
5.5
RFA GEOMETRIC PERFORMANCE REQUIREMENTS
5.5.1
COVERAGE REQUIREMENTS
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R-GEO-RFA-0320-TA
The Beam On-Board Angle (OBA) shall be in the range 44.8° ±1.05° (TBC) for each antenna beam.
The OBA is the angle between the direction of the beam electrical boresight and the rotation axis of the MWI
instrument.
Derived From R- PRF-ANT-0050-TAR of the [AD09]
R-GEO-RFA-0321-TA Deleted
5.5.2
POINTING PERFORMANCE REQUIREMENTS
R-POI-RFA-1420-TA
RFA absolute pointing accuracy shall be < [TBD] ° (1σ) per axis (along scan and across
scan).
Derived From IRS_R-MWI-1420-TA
R-POI-RFA-0390-TA
The pointing knowledge of the RFA electrical boresight with respect to instrument
reference frame shall be < [TBD] ° (1σ) per axis (along scan and across scan).
Derived From IRS_R-MWI-0390-TA
R-POI-RFA-1430
The relative pointing knowledge of any channel electrical boresight with respect to MWI-8
shall be < 0.01° [TBC] per axis.
Derived From IRS_R-MWI-1430
5.5.3
ANTENNA PERFORMANCE REQUIREMENTS
R-ANT-RFA-0100-TR The insertion loss of the main reflector active face shall be llower than 0.01 dB from 18 to
195 GHz (Corresponding to a Reflectivity of 99.8 %). A pure metallic coating is mandatory
on the active face
A surface treatment to avoid concentration of the visible and infrared radiation shall be
included
Note: this requirement is one parameter of the instrument radiometric accuracies,
Derived From IRS_R-MWI-0240-TA, IRS_R-MWI-0270-TA, IRS_R-MWI-0290
R-ANT-RFA-0110-T
The insertion loss shall be verified on representative samples with measurement accuracy
better than ± 0.001 dB
Note: this requirement is one parameter of the instrument radiometric accuracies,
Derived From IRS_R-MWI-0240-TA, IRS_ R-MWI-0270-TA, IRS_R-MWI-0290
R-ANT-RFA-0410-TA MWI footprint size shall be as follows:
• ≤ 50 km for MWI-1 – MWI-2
• ≤ 30 km for MWI-3 – MWI-7
• ≤ 10 km for MWI-8 – MWI-18
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
≥ 47.0 km for MWI-1 – MWI-2
• ≥ 28.5 km for MWI-3 – MWI-7
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• ≥ 9.5 km for MWI-8 – MWI-18
Note: The orbital parameters of the MetOp satellite shall be taken into account to
estimate the Footprint. Footprint size is defined at the highest distance between S/C and
ground. Footprint is the arithmetic mean of the two axes of the Footprint Ellipse
Derived From R- PRF-ANT-0070-AR of AD09
R-ANT-RFA-0420-T
RFA shall have main beam efficiency > 95 % for all channels.
Note: Requirement applies to 4π sphere.
Derived From R-MWI-0420-T and R-MWI-0240-TA
R-ANT-RFA-0421-T
RFA shall have wide beam efficiency > 98 % for all channels and for all scene beam
positions.
Note: Requirement applies to 4π sphere.
Derived From R-MWI-0421-T
R-ANT-RFA-0422-TA RFA spillover shall be less than:
Channel
Frequency [GHz]
Spillover [%]
MWI-1
18.7
2 [TBC]
MWI-2
23.8
2 [TBC]
MWI-3
31.4
2 [TBC]
MWI-4
50.3
0.6 [TBC]
MWI-5
52.61
0.6 [TBC]
MWI-6
53.24
0.6 [TBC]
MWI-7
53.75
0.6 [TBC]
MWI-8
89
2 [TBC]
MWI-9
118.7503±3.2
1.9 [TBC]
MWI-10
118.7503±2.1
1.9 [TBC]
MWI-11
118.7503±1.4
1.9 [TBC]
MWI-12
118.7503±1.2
1.9 [TBC]
MWI-13
165.5±0.725
1.1 [TBC]
MWI-14
183.31±7.0
1 [TBC]
MWI-15
183.31±6.1
1 [TBC]
MWI-16
183.31±4.9
1 [TBC]
MWI-17
183.31±3.4
1 [TBC]
MWI-18
183.31±2.0
1 [TBC]
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Table 5-7: Spillover requirements
Note: this spillover requirement is one parameter of the instrument radiometric accuracies,
Derived From R- PRF-ANT-0130-AR of AD09
R-ANT-RFA-0423-TA The percentage of energy due to sidelobes shall be less than:
Channel
MWI-1
MWI-2
MWI-3
MWI-4
MWI-5
MWI-6
MWI-7
MWI-8
MWI-9
MWI-10
MWI-11
MWI-12
MWI-13
MWI-14
MWI-15
MWI-16
MWI-17
MWI-18
Frequency
[GHz]
18,7
23,8
31,4
50,3
52,61
53,24
53,75
89
118,7503 ±
118,7503 ±
118,7503 ±
118,7503 ±
165,5
±
183,31
±
183,31
±
183,31
±
183,31
±
183,31
±
3,2
2,1
1,4
1,2
0,725
7,0
6,1
4,9
3,4
2,0
Sidelobes
[%]
< 3,0
< 3,0
< 3,0
< 3,0
< 3,0
< 3,0
< 3,0
< 2,0
< 2,0
< 2,0
< 2,0
< 2,0
< 1,5
< 1,5
< 1,5
< 1,5
< 1,5
< 1,5
Table 5-8: Energy in the sidelobes requirements
Note: this energy in sidelobes requirement is one parameter of the instrument radiometric
accuracies.
Derived From R- PRF-ANT-0120-AR of [AD09]
R-ANT-RFA-0430-T
RFA antenna pattern shall be measured down to < -60 dB.
Note: Requirement is defined as relative level to the peak of the co polarization antenna
pattern. Requirement applies to 4π sphere.
Derived From IRS-R-MWI-0430-T
R-ANT-RFA-0460-T
RFA antenna pattern shall be measured over full 4π sphere.
Derived From IRS_R-MWI-0460-T
R-ANT-RFA-0440-T
RFA Wide beam antenna pattern shall be measured at angular resolution of:

< 0.05° for channels MWI-1 and MWI-2,
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION

< 0.03° for channels MWI-3 – MWI-7,

< 0.01° for channels MWI-8 – MWI-18.
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Derived From IRS_R-MWI-0440-T
R-ANT-RFA-450-T
RFA antenna pattern outside the wide beam shall be characterized and all side lobes
greater than -60dB measured at angular resolution of < 0.5°.
Derived From IRS_R-MWI-0450-T
R-ANT-RFA-490-TAR RFA linear polarisation of each channel shall be according to Table 5-9.
Note: Polarization vectors (V and H) are defined in Figure 5-2.
Table 5-9: RFA channel polarisation
Figure 5-2: MWI polarisation Vectors
R-ANT-RFA-1500-T
Each polarization shall be aligned within +/-0.5° from the plane of incidence.
Derived From R-MWI-1500-T
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-ANT-RFA-0500-TA The cross-polarization shall be lower than:
Channel
Frequency [GHz]
Cross-polarisation
[%]
MWI-1
18.7
0.5 [TBC]
MWI-2
23.8
0.4 [TBC]
MWI-3
31.4
0.5 [TBC]
MWI-4
50.3
0.4 [TBC]
MWI-5
52.61
0.4 [TBC]
MWI-6
53.24
0.4 [TBC]
MWI-7
53.75
0.4 [TBC]
MWI-8
89
0.5 [TBC]
MWI-9
118.7503±3.2
0.4 [TBC]
MWI-10
118.7503±2.1
0.4 [TBC]
MWI-11
118.7503±1.4
0.4 [TBC]
MWI-12
118.7503±1.2
0.4 [TBC]
MWI-13
165.5±0.725
0.4 [TBC]
MWI-14
183.31±7.0
0.4 [TBC]
MWI-15
183.31±6.1
0.4 [TBC]
MWI-16
183.31±4.9
0.4 [TBC]
MWI-17
183.31±3.4
0.4 [TBC]
MWI-18
183.31±2.0
0.4 [TBC]
Table 5-10: RFA channel cross-polarisation requirement
Note: The cross-polarisation requirement is one parameter of the instrument radiometric
accuracies.
Derived From R- PRF-ANT-0140-AR of [AD09]
R-ANT-RFA-0510-T
The cross-polarization response of the instrument shall be known to -35 dB.
Note: Requirement is relative to the peak of co-polarization antenna pattern. Requirement
applies to 4π sphere.
Derived From IRS_R-MWI-0510-T
R-ANT-RFA-0520-T
RFA antenna cross polarization shall be measured over full 4π sphere.
Derived From IRS_R-MWI-0520-TA
R-ANT-RFA-1510-T
RFA Wide beam cross polarization antenna pattern shall be measured at angular
resolution of:

< 0.05 ° for channels MWI-1 and MWI-2,

< 0.03 ° for channels MWI-3 – MWI-7,
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION

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< 0.01° for channels MWI-8 – MWI-18.
Derived From IRS_R-MWI-1510-TA
R-ANT-RFA-1520-T
RFA cross polarization antenna pattern outside the wide beam shall be characterized and
all side lobes greater than -60dB measured at angular resolution of < 0.5°.
Derived From IRS_R-MWI-1520-TA
5.5.4
INTERNAL CALIBRATION REQUIREMENTS
R-NDC-RFA-0010-R
RFA shall include internal calibration sources for channels MWI-1, MWI-2 and MWI-3.
Derived From IRS_R-MWI-1170-R
R-NDC-RFA-0020-R
Internal calibration sources shall be noise diodes (ND).
Derived From IRS_R-MWI-1180-R
R-NDC-RFA-0022-R
The excess noise value shall be in the 100 +/- 10 K.
R-NDC-RFA-0025-TR It shall be possible to activate / deactivate the noise diodes by means of discrete (on/off)
control signals.
Derived From IRS_R-MWI-1190-TR and IRS_R-MWI-1200-TR
R-NDC-RFA-0030-TR
It shall be possible to activate the noise diodes at any time, and independently of each
other
Derived From IRS_R-MWI-1190-TR and IRS_R-MWI-1200-TR
R-NDC-RFA-0033-TR
The signal from the noise diodes shall be stable within 1 ms after the application of the
command
5.6
THERMAL HARDWARE REQUIREMENTS
R-THR-RFA-0010-R
The Heating orbital average power for the RFA shall be as follows:
Location
RFA Deck
RFA Feed Cluster
Operation mode
≤35 W [TBC]
≤10 W [TBC]
Survival mode
≤25 W [TBC]
≤15 W [TBC]
R-THR-RFA-0015-TR For thermal control, the RFA shall be provided of 10 “Main” + 10 “Redundant” [TBC]
heaters lines from the CDPU in normal mode with a maximum delivery power of 10 W
[TBC] each.
R-THR-RFA-0020-TR For thermal control, the RFA shall be provided of 2 “Main” + 2 “Redundant” [TBC] heaters
lines from the S/C in survival mode with a maximum delivery power of 50 W [TBC]
including 20% of margin.
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-THR-RFA-1740-TR Thermal control in survival mode shall be performed autonomously by the RFA by means
of thermostats.
Derived from R-MWI-1740-T
R-THR-RFA-0030-TR The following temperatures shall be collected and so the relevant temperature sensors set
will be provided according to the block diagram show in Figure 4-2.
TS1
Main Reflector
TS2
Integrated Receiver SH RX 18.7 GHz H
TS3
Integrated Receiver SH RX 18.7 GHz V
TS4
Integrated Receiver RX 23.8 GHz H
TS5
Integrated Receiver RX 23.8 GHz V
TS6
Front End Receiver RX 31.4 GHz H
TS7
Front End Receiver RX 31.4 GHz V
TS8
Front End Receiver Do Con 50-54 GHz H
TS9
Front End Receiver Do Con 50-54 GHz V
TS10
Back End BE 50-54 GHz H
TS11
Back End BE 50-54 GHz V
TS10
Front End Receiver RX 89 GHz H
TS11
Front End Receiver RX 89 GHz V
TS12
Front End Receiver Do Con 118 GHz
TS13
Front End Receiver Do Con 165 GHz
TS14
Front End Receiver Do Con 183 GHz
TS15
Back End BE 118 GHz
TS16
Back End BE 165 GHz
TS17
Back End BE 183 GHz
Each temperature sensor set will be composed of three sensors for redundancy purposes.
R-THR-RFA-0040-TR For thermal control loop of the heaters lines, thermistors shall be provided for each heater
line on the rotating part of the MWI containing the RFA.
R-THR-RFA-0050-R
An MLI blanket of 12 [TBC] layers shall be installed outside of the RFA cone. Cone shall
provide attachment points and grounding points to the blanket, as needed.
R-THR-RFA-0060-R
An MLI blanket of 12 [TBC] layers shall be installed on the outer side of the roof of the
Cone. The roof shall provide attachment points and grounding points to the blanket, as
needed.
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-THR-RFA-0070-R
An MLI blanket of 12 [TBC] layers shall be installed on the inner side of the Cone. The
Cone shall provide attachment points and grounding points to the blanket, as needed.
Outer layer of this blanket shall be crinkled, to limit specular reflection to <0.2.
R-THR-RFA-0080-R
An MLI blanket of 12 [TBC] layers shall be installed on the inner side of the roof of the
Cone. The roof shall provide attachment points and grounding points to the blanket, as
needed. Outer layer of this blanket shall be crinkled, to limit specular reflection to <0.2.
R-THR-RFA-0090-R
An MLI blanket of 12 [TBC] layers shall be installed on the back side of the main reflector.
The reflector shall provide attachment points and grounding points to the blanket, as
needed. Outer layer of this blanket shall be crinkled, to limit specular reflection to <0.2.
R-THR-RFA-0100-R
The deck shall have emissivity >0.8 [TBC] at both sides.
R-THR-RFA-0110-R
All units mounted on the deck shall have emissivity >0.8.
R-THR-RFA-0120-R
An MLI blanket of 12 [TBC] layers shall be installed around the feed horn assembly
(enveloping the horns, waveguides, RX and DC units which are not directly mounted on the
deck). Outer layer of this blanket shall be crinkled, to limit specular reflection to <0.2.
R-THR-RFA-0130-R
An aluminium radiator shall be employed, to reject the heat of the feed cluster
2
subassembly. Radiator area shall be 0.16m [TBC] at least. SSM optical coatings shall be
applied, in agreement with prime.
R-THR-RFA-0140-R
The MLI blanket of 12 layers, shall grant at least the following thermal decoupling:
GLMLI
<= 0.0470
GRMLI
<= 0.0203
Where the two values represent the equivalent thermal conductance (conductive and
radiative) of the blanket between its two faces (1 and 2), according to the formula:
Q12 = A * (GLMLI * (T1-T2) + s * GRMLI * (T1^4 – T2^4)),
With Ti = temperature of the MLI inner and outer layer, A = total blanket area, and s =
Stefan-Boltzmann constant
R-THR-RFA-0150-R
MLI blankets shall be grounded.
R-THR-RFA-0160-R
MLI blankets shall have adequate venting provisions.
5.7
TELEMETRY REQUIREMENTS
R-TTLM-RFA-0010-TR [TBD] temperatures measured on RFA items shall be provided to be included in the MWI
science telemetry.
R-TTLM-RFA-0020-TR The main characteristics of these temperature telemetries shall be:
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
Type
MWI Equipment
No. of lines /
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Telemetry
RFA
Temperature telemetry: 2 wires per thermistor
wires
Sensor type
YSI 44907 / 44908 (10KOhm at 20°C)
or Betatherm G15K4D489 (15 KOhm at 20°C)
Type of
Connector
[TBD]
R-TTLM-RFA-0030-TR Temperatures accuracy of the thermistors shall be better than ±1°C [TBC] in the range [60°C, +80°C].
R-TTLM-RFA-0040-TR Six temperature sensors (3 main + 3 redundant) direct lines shall be provided by the RFA
for survival temperature monitoring.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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6. RELIABILITY REQUIREMENTS
R-REL-RFA-0540-ARI RFA equipment shall have failure rates batter than:
HORN+OMT MWI-1-2:
RX Channel MWI-1 (H/V):
RX Channel MWI-2 (H+V):
12 fit
550 fit each
200 fit each
HORN+OMT MWI-3:
RX Channel MWI-3 (H+V):
12 fit
200 fit each
HORN+OMT MWI-4-7:
DoCon + LO MWI-4-7:
BE MWI-4-7 (H+V):
12 fit
270 fit
280 fit each channel
HORN+OMT MWI-8:
RX Channel MWI-8 (H+V):
12 fit
200 fit each
HORN MWI-9-12:
DoCon + LO MWI-4-7:
BE MWI-9-12 + MWI 13 (V):
7 fit
270 fit
280 fit each channel
HORN MWI-13:
DoCon + LO MWI-13:
7 fit
270 fit
HORN MWI-14-18:
DoCon + LO MWI-14-18:
BE MWI-14-18 (V):
7 fit
270 fit
280 fit each channel
Derived From IRS_R-MWI-0540-ARI
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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7. OPERATIONAL REQUIREMENTS
R-OPR-RFA-0030-TR RFA receivers shall provide measurement video signals continuously over each full orbit.
Derived From IRS_R-MWI-0030-TR
R-OPR-RFA-1770-T
In Operational mode, RFA is rotated continuously. All the receivers’ channels are active.
R-OPR-RFA-1771-T
RFA shall have the capability to be operated with one or several channels being switched
OFF.
Nominal performances of the remaining active channels shall not be degraded.
R-OPR-RFA-1772-T
In pointing mode, RFA is stopped in a fixed position. All the channels receivers are ON.
The RFA shall be able to operate in pointing mode for at least 30 minutes
R-OPR-RFA-1773-T
7.1
In survival mode, RFA is stopped in a fixed position. All the channels receivers are OFF. A
passive thermal control is performed.
LIFETIME
TBW
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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8. INTERFACES REQUIREMENTS
8.1
MECHANICAL INTERFACES REQUIREMENTS
The following picture shows the MWI mechanical architecture overview:
Figure 8-1: MWI mechanical architecture overview
It must be pointed out that this specification is at RF Assembly level. Further derivation of requirements at
equipment level shall be performed by RFA responsible.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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At this stage, GDIR structural requirements are considered applicable at RFA level because of high stiffness of the
LLD.
8.1.1
REFERENCE FRAMES
NAR-IFC-RFA-0010
Deleted
NAR-IFC-RFA-0020
Deleted
NAR-IFC-RFA-0030
The RFA local reference frame RFA shall be orthogonal, right-handed and defined as per
[AD21]:
The origin ORFA of the RFA corresponds with the intersection between the instrument
rotation axis and the interface plane with the scan mechanism. The direction and the
orientation of the ZRFA axis of the RFA are coincident with the direction and the orientation
of the ZINSTR axis from the rotating part interface plane to the main reflector. The X RFA axis
of RFA is parallel to the rotating part interface plane, oriented toward the focus of the main
reflector.
Due to clamping system release after launch, the ORFA vertical coordinate is different in
launch and flight configuration writ instrument reference frame. ORFA coordinates in mm are
(0.,0.,270.) in nominal launch configuration (i.e. the antenna focus is aligned with the –
XINSTR axis and the RFA is clamped on the LLD) in the INSTR reference frame
8.1.2
RFA DIMENSIONS AND MASS
R-IFC-RFA-0040-RI
The maximum volume envelope of the RFA is a cylinder with 1400 mm diameter and
1562.5 mm height.
Derived From IRS_R-MWI-1580-RI
R-IFC-RFA-0050-TA
The maximum mass of the RFA shall be < 95 kg [TBC], including harness, thermal and
mechanical hardware and excluding balancing countermasses. The above mentioned
value shall include margins on units.
Derived From IRS_R-MWI-1630-T
R-IFC-RFA-0135-R
The balancing countermasses shall be lower than 7.2 kg [TBC].
Derived From IRS_R-MWI-1630-T
8.1.3
RFA DYNAMIC RANGE
R-IFC-RFA-0060-A
The maximum moment of inertia of the RFA around the instrument rotation axis shall be <
2
21 [TBC] kg x m . Including also the contributions of all rotating harness, the balancing
countermasses, the rotating part of the SCM and the LLD, the CDPU and the FEE.
8.2
INTERFACES DEFINITION
8.2.1
GENERAL INTERFACES
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-IFC-RFA-0070-R
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The following figure define the interfaces of the RFA with the others parts of the MWI
instrument:

RFA  SCM

RFA  CDPU

RFA  FEE

RFA  LLD

RFA  Handling GSE
Figure 8-2: RFA interfaces (in launch and operational configuration)
R-IFC-RFA-0072-R
For alignment purposes, a reflecting mirror cube shall be placed on top of the roof, in
correspondence of the instrument rotation axis. The alignment of this reference cube wrt to
the RFA reference frame shall be better than [TBD].
R-IFC-RFA-0074-R
The RFA shall be provided with provisions to accommodate balancing countermasses.
These provisions shall be accessible from the external after RFA integration.
8.2.2
RFA INTERFACE WITH SCM
R-IFC-CA-0080-R
The RFA is permanently connected to the Scan Mechanism rotating part.
R-IFC-CA-0090-R
The mechanical interface with the SCM shall be as follows:
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
Parameters
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Sr.
No.
1
Details
No. of fixings
2
Surface finish
12
threaded
holes
M6x1x1.5D
equidistant on a diameter 320 mm with a
hole at 0° wrt the XRFA axis. Screw
insertion direction is coincident with
+ZRFA orientation.
1.6 microns [TBC]
3
Accuracy of holes location
0.1 mm [TBC]
4
Interface plane flatness
0.1/100 [TBC]
5
0.05 mm [TBC]
6
Co planarity of Interface plane wrt
to XRFA-YRFA plane
No. of reference dowel pins (*)
7
Dowel pins position tolerance
8
Dowel pins perpendicularity to I/F
Plane
2 dowel pins ISO 2338 diameter 6m6
mm
and
diameter
5m6
mm
symmetrically located on a diameter 320
mm; height of both pins: 8 mm; diameter
6 mm pin located at 15° wrt the X RFA
axis.
0.03 [TBC]
0.03 [TBC]
(*) Reference dowel pins are needed for accurate location of RFA wrt SCM.
Table 8-1: Interface with SCM
8.2.3
RFA INTERFACE WITH CPDU AND FEE
R-IFC-RFA-0100-R
The CDPU and FEE are located in the lower part of the RFA deck.
R-IFC-RFA-0110-R
The CDPU and FEE are permanently connected to the RFA deck.
R-IFC-RFA-0115-R
The CDPU and FEE reference positions on the RFA deck shall be optimized in accordance
with the static and dynamic unbalancing requirements R-IFC-RFA-0170-TAR and R-IFCRFA-0175-TAR in order to minimize the amount of balancing coubntermasses.
R-IFC-RFA-0120-R
The CDPU and FEE volumes are:

CDPU:
o
o
o
o

FEE:
o
o
o
Width: 255 mm [TBC]
Depth: 240 mm [TBC]
Height: 155 mm [TBC]
These figures include the RFI processor module – this can be a separate unit
(TBC)
Width: 210 mm [TBC]
Depth: 250 mm [TBC]
Height: 140 mm [TBC]
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-IFC-RFA-0130-R
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CDPU: 8.2 kg max [TBC] including 20% of margin - This figure includes the RFI
processor module – this can be a separate unit (TBC)
FEE: 7.2 kg max [TBC] including 20% of margin
The masses of the rotating parts of the LLD and the SCM are:


8.2.4
MOS-RS-CGS-MWI-0006
The CDPU and FEE masses are:

R-IFC-RFA-0132-R
N° Doc:
Doc N°:
LLD: 0.65 kg max [TBC] for each LLD including 20% of margin
SCM: 23.0 kg max [TBC] including 20% of margin
RFA INTERFACE WITH LLD AND SCM PRELOADING GSE
R-IFC-RFA-0135-R
The RFA shall interface with LLD and the SCM preloading GSE in three areas which are
equispaced over a 1250 mm interaxis in accordance with Figure 8-3:
Figure 8-3: Locations of interfaces with LLD and SCM preloading GSE
R-IFC-RFA-0140-R
Sr. No.
1
2
The mechanical interface with LLD and the SCM preloading GSE shall be a channel type
fitting defines as follows (see Figure 8-4):
Parameters
No. and type of fittings
Fittings material and surface treatment
Details
3
Ti6Al4V grade 5 [TBC]
Surface treatment: [TBD]
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
3
4
5
6
7
8
9
10
Fittings location
LLD fitting height from RFA lower deck plane
SCM preloading GSE fitting height from RFA
upper deck plane
Parallelism with SCM interface plane
Flatness accuracy between all LLD and RFA
lower deck plane
Local flatness accuracy at each LLD and
SCM preloading GSE interface plane
LLD interface plate thickness
LLD interface plate area
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See Figure 8-4 [TBC]
-140 mm [TBC] ± [TBD] mm
0 mm [TBC] ± [TBD] mm
0.1 mm [TBC]
0.1 mm [TBC]
0.05 mm [TBC]
[TBD] ± [TBD] mm
60 mm [TBC] x 100 mm [TBC]
Table 8-2: Description of LLD and SCM preloading GSE interfaces with RFA
Figure 8-4: Mechanical interface with LLD and SCM preloading GSE
R-IFC-RFA-0145-TAR The additional preload sizing parameters for the interfaces with LLD and SCM preloading
GSE shall be:

Limit vertical tension force to be applied during SCM preload: 15000 N [TBC]
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION


8.2.5
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Limit lateral force to be applied during preload: 1000 N [TBC]
Capability to withstand non-simultaneous release of LLDs (only one LLD engaged)
RFA INTERFACE WITH OFFLOADING AND HOISTING GSE
R-IFC-RFA-0150-R
The RFA shall interface with the offloading and the hoisting GSE in three areas which are
located over a 1250 mm interaxis in accordance with Figure 8-5:
Figure 8-5: Locations of interfaces with offloading and hoisting GSE
R-IFC-RFA-0155-R
Sr. No.
The mechanical interface with offloading and hoisting GSE shall be a channel type fittings
defines as follows:
Parameters
1
2
No. and type of fixings
Fittings material and surface treatment
3
4
5
6
Fittings location
Fitting height from RFA lower deck plane
Parallelism with SCM interface plane
Flatness accuracy between all offloading and
hoisting GSE interfaces and RFA lower deck
plane
Flatness accuracy between each offloading
7
Details
3
Ti6Al4V grade 5 [TBC]
Surface treatment: [TBD]
See Figure 8-5 [TBC]
0 mm [TBC] ± [TBD] mm
0.1 mm [TBC]
0.1 mm [TBC]
0.05 mm [TBC]
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
8
9
and hoisting GSE interfaces and RFA lower
deck plane
Offloading and hoisting GSE interface plate
thickness
Offloading and hoisting GSE interface plate
area
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[TBD] mm ± [TBD] mm
[TBD] mm x [TBD] mm
Table 8-3: Description of offloading and hoisting GSE interfaces with RFA
R-IFC-RFA-0160-AR
The Sizing parameters for the interfaces with offloading and hoisting devices shall be:


Mass to be considered for hoisting is 250 kg [TBC]
Load factors to be considered for hoisting shall be:
Handling & hoisting
Horizontal / In plane [g]
Vertical [g]
Simultaneously acting
loads
 0.2
-1.3/+0.5
Table 8-4: Load factors for hoisting
8.2.6
BALANCING
R-IFC-RFA-0165-TAR In the RFA reference coordinate system, the ZRFA coordinate of the CoG of the RFA shall
be  220 mm including also the contributions of all rotating harness, the balancing
countermasses, the rotating part of the SCM and the LLD, the CDPU and the FEE.
R-IFC-RFA-0170-TAR The maximum static unbalance of the RFA around the instrument rotation axis shall be 
0.07 kgm including also the contributions of all rotating harness, the balancing
countermasses, the rotating part of the SCM and the LLD, the CDPU and the FEE.
R-IFC-RFA-0175-TAR The maximum dynamic unbalance of the RFA around the instrument rotation axis shall be
 0.02 kgm2 including also the contributions of all rotating harness, the balancing
countermasses, the rotating part of the SCM and the LLD, the CDPU and the FEE.
8.2.7
RFA FIELD OF VIEW
R-IFC-RFA-0176-R
The earth acquisition field of view geometry shall be in accordance with Figure 8-6 and
Table 8-5.
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SPECIFICATION
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[TBD]
Figure 8-6: Earth acquisition field of view
Table 8-5: Earth acquisition field of view [TBC]
R-IFC-RFA-0177-R
The cold calibration field of view geometry shall be in accordance with Figure 8-7 and
Table 8-6.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Figure 8-7: Cold calibration field of view
Table 8-6: Cold calibration field of view [TBC]
R-IFC-RFA-0178-R
The hot calibration field of view geometry shall be in accordance with Figure 8-8: Hot
calibration field of view and Table 8-7
Figure 8-8: Hot calibration field of view
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Table 8-7: Hot calibration field of view [TBC]
8.2.8
RFA INTERFACE WITH THE CALIBRATION ASSEMBLY
R-IFC-RFA-0180-R
The RFA shall host within its internal cavity the Calibration Assembly (CA) made of the
Cold sky reflector, the On Board Calibration Target (OBCT) and their mechanical support.
Other requirements [TBD].
8.3
THERMAL INTERFACES REQUIREMENTS
The thermal design is based on a passive thermal control for all reflectors and structural elements and an active
thermal control for the feed-cluster and front-ends assembly and for electronics units. The thermal design uses, as
far as possible, passive elements (MLI, SSM, Insulations washers, painting,…) supplemented when necessary by
active elements (Heaters, thermistors,…). In operational modes the instrument thermal fluctuations are naturally
reduced by the spin of the instrument.
The thermal design concept is show in the picture below:
Figure 8-9: MWI Thermal design concept with platform shadowing
R-IFC-RFA-1020-A
Thermal interface model (preferably, a thermal detailed model) shall be generated for
integration into system model. Detail level shall be agreed with prime. No more than 5000
nodes [TBC], no less than 1000 nodes [TBC] are required. (Note: number of nodes may
be exceeded, provided that the radiative nodes (i.e. nodes present in the GMM) are kept
under a reasonable limit.
R-IFC-RFA-1030-A
Thermal interface/detailed model shall be generated for integration into system model.
Detail level shall be agreed with prime. The delivered thermal model shall have a sufficient
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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detail level to allow to verify at system level all the temperature requirements listed
applicable to the units contained in the assembly.
8.3.1
TEMPERATURE DEFINITION AND DISSIPATION
R-IFC-RFA-1000-R
Temperatures definition:



R-IFC-RFA-1005-R
Storage temperatures shall be -50°C / +70°C [TBC]
Acceptance temperature shall be defined as Design temperature ± 5°C [TBC]
Qualification temperature shall be defined as Design temperature ± 10°C [TBC]
Units Qualification temperatures shall be according the following table:
Item
Qualification
OP range
Qualification
NOP range
OP temperature
variation over
one orbit
OP
temperature
variation over
lifetime
Specific thermal requirements
Main reflector
Cold
Calibration
reflector
Feed Cluster
RF equipment
RX DD, DoCon,
BE
-110°C/+80°C
N.A.
-120°C/+120°C
N.A.
< 65°C
N.A.
< 80°C
N.A.
-40°C/+60°C
+5°C/+55°C
-70°C/+70°C
-50°C/+70°C
< 5°C
< 10°C
FEE and CPDU
Structural
items
ICU and SCE
N.A.
-60°C/+65°C
N.A.
-65°C/+85°C
N.A.
N.A.
Temperature variation over
one rotation (~2s)
< 0,003°C/s for 89 GHz to
183 GHz channels
< 0,006°C/s for 18 GHz to 54
GHz channels
Not part of RFA
N.A.
N.A.
N.A.
N.A.
Not part of RFA
Not part of RFA
Table 8-8: Qualification temperatures
R-IFC-RFA-1010-A
8.3.2
The RFA power consumption shall be less than 45 W EOL [TBC] including 20% of margin.
RECEIVERS AND FEED CLUSTER
R-IFC-RFA-0185-R
The receivers and feed cluster shall be installed on a self-standing mechanical structure.
R-IFC-RFA-0190-R
The receivers and feed cluster shall be thermally insulated from the deck, by means of low
conductance feet. Interface conductivity shall be lower than 0.25W/K [TBC] overall.
R-IFC-RFA-0200-R
The receivers and feed cluster shall be thermally insulated from the MWI instrument, by
means of MLI blankets. MLI performance shall be better than [TBD]. Only exposed parts
shall be the isolative mounting feet, the feed horns, and the Feed Cluster radiator.
R-IFC-RFA-1040-TR
The MLI blanket receiver and feed cluster shall grant at least the following thermal
decoupling:
GLMLI
<= 0.0470
GRMLI
<= 0.0203
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Where the two values represent the equivalent thermal conductance (conductive and
radiative) of the blanket between its two faces (1 and 2), according to the formula:
Q12 = A * (GLMLI * (T1-T2) + s * GRMLI * (T1^4 – T2^4)),
With Ti = temperature of the MLI inner and outer layer, A = total blanket area, and s =
Stefan-Boltzmann constant
R-IFC-RFA-0210-A
Operational conductive sink temperature at deck interface shall be 20±20°C [TBC]; non
operational shall be 10 ± 50°C [TBC].
R-IFC-RFA-0220-A
Radiation sink temperature for MLI external faces shall be [TBD]. Each side shall have its
proper interface temperature.
R-IFC-RFA-0230-A
The receivers and feed cluster shall not exchange (through mounting feet and MLI) no
more than 4W [TBC] with the rest of the MWI instrument.
R-IFC-RFA-0240-R
Thermal management of the RFA shall be performed autonomously, through an
appropriate thermal design which shall consider the radiator as the ultimate heat sink.
R-IFC-RFA-0250-R
Thermo-optical finishes of the radiator shall be agreed with system architect. SSM coating
is the baseline [TBC].
R-IFC-RFA-0260-R
The environmental conditions of the radiator shall be defined in all the sizing cases,
operational modes, and both at orbital frequency (low frequency) and at rotation frequency
(high frequency).
R-IFC-RFA-0270-A
Deleted
R-IFC-RFA-1050-TR
The receiver and feed cluster shall be covered with embossed MLI (12 layers), crinkled
outer skin. Thermal characteristics of the external layer thermal coating shall be:

= 0.71

= 0.4 / 0.52 (BOL/EOL)

Secularity: <0.2
Internal layer shall be aluminized.
R-IFC-RFA-0280-R
8.3.3
Operational Heaters shall be installed to provide necessary thermal stability and
achievement of temperature limits. Appropriate control logic shall be implemented.
REFLECTOR THERMAL INTERFACES
R-IFC-RFA-0290-R
Reflector thermal control shall be passive (no heaters).
R-IFC-RFA-0300-R
Reflector shall be thermally isolated at back side with MLI blankets.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-IFC-RFA-0310-AR
Main Reflector antenna shall be conductively isolated from their mechanical support
structures, with a total conductance lower than 0.01 W/K [TBC].
R-IFC-RFA-0320-R
Optical properties of reflector side shall be selected to avoid overheating of the antennas.
An emissivity/absorptivity ratio higher than 0.85 is required.
R-IFC-RFA-0330-TR
Optical properties values (absorptivity, emissivity and reflectivity) shall be measured and
stored.
R-IFC-RFA-0340-R
Thermal relevant properties (materials, shapes) shall be provided to the prime, sufficient to
build a representative thermal model (in alternative: a thermal model shall be delivered,
whose dimensions shall be agreed with prime).
8.3.4
DECK THERMAL INTERFACES
R-IFC-RFA-1060-R
Deck thermal interfaces with non-RFA equipment are:
 Conductive
o SCAN mechanism
o FEE
o CDPU
 Radiative
o Lower enclosure (lower side)
o Upper Single layer insulation/Racetrack [TBC]
o Calibration Assembly support structure
o Thermal skirt
R-IFC-RFA-1070-R
Deck shall be thermally coupled to FEE and CDPU; a flat mounting interface shall be
provided to these units.
R-IFC-RFA-1080-R
Deck shall provide a heat sink to the FEE and CDPU, assuming a heat rejection up to 35W
and 41W respectively.
R-IFC-RFA-1090-R
A thermal filler [TBD] shall be put at the interface between FEE/CDPU and deck.
R-IFC-RFA-1100-R
A thermal conductance better than 1.0W/K [TBC] shall be ensured at the interface between
the deck and the SCAN mechanism.
R-IFC-RFA-1110-R
Deck radiative interfaces are [TBD]. It is assumed that the deck shall reject the heat load of
the units mounted on it mainly through radiation towards its radiative sinks.
8.4
ELECTRICAL INTERFACES REQUIREMENTS
8.4.1
GENERAL
R-IFC-RFA-0350-R
The RFA shall be electrically interfaced with the following equipment and transmission
media:



Front End Electronics (FEE)
Control Data Processing Unit (CDPU)
Free space “Reflector Antenna interface”
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
8.4.2
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FEE INTERFACES
The RFA electrical interface toward the FFE shall be composed of the following type of
signals:
R-IFC-RFA-0360-R
Power Supply rails,
Direct telecommand for RF channels gain and offset level setting,
Direct telecommand for noise diode switch on/off command.
Direct telecommand for LO power level setting




Direct telecommand links are based on Standard Balanced Digital Link, SBDL (see ECSSE-ST-50-14C § 8.8.2).
The power supply interface shall be composed of four set power supply rails with output
power distribution and delivered power [TBC] as show in Table 8-9:
R-IFC-RFA-0370-R
Power output
SET#1
Power supply rails
+8.8V +2.5V +5.5V
-
X
X
FEE modules Power outputs assignment
FEE Power [mW]
±8V
#1
#2
#3
#4
#5
#6
#1
#2
#3
#4
#5
#6
X
MWI-1
Hor
(HD RX)
MWI-1
Vert
(HD RX)
MWI-2
Hor
(DD RX)
MWI-2
Vert
(DD RX)
MWI-13
Vert
(BE)
+2.5V unloaded
MWI-8
Hor
(DD RX)
2500
2500
1420
1420
750
1495
MWI-4 -5
-6 -7
Vert
(DoCon)
+/-8V unloaded
MWI-4 -5
-6 -7
Vert
(BE)
(note1)
MWI-1
Hor
(NOISE DIODE)
MWI-4 -5
-6 -7
Hor
(DoCon)
+/-8V unloaded
MWI-4 -5
-6 -7
Hor
(BE)
(note1)
MWI-1
Ver
(NOISE DIODE)
MWI-9 -10
-11 -12
Vert
(DoCon)
+/-8V unloaded
MWI-9 -10
-11 -12
Vert
(BE)
(note1)
MWI-2
Hor
(NOISE DIODE)
MWI-14 -15
-16 -17 -18
Vert
(DoCon)
+/-8V unloaded
MWI-14 -15
-16 -17 -18
Vert
(BE)
(note1)
MWI-2
Vert
(NOISE DIODE)
MWI-13
Vert
(DoCon)
+/-8V unloaded
MWI-8
Vert
(DD RX)
1490
1490
1180
1780
1780
1495
MWI-3
Hor
(DD RX)
MWI-3
Vert
(DD RX)
3000
3000
3000
3750
1630
1630
MWI-3
Hor
(NOISE DIODE)
MWI-3
Vert
(NOISE DIODE)
150
150
150
150
150
150
7140
7140
5750
7100
4310
4770
SET#2
-
X
X
X
SET#3
-
-
X
X
SET#4
X
-
-
-
Notes:
(1) Back End units shall provide separated power supply lines (up to 5) in order to allow independent switch on/off of the MWI
channels
(2) It shall be not possible to lose more than one channels among MWI-1, MWI-2 and MWI-3 (related equipment are indicated in
golden-brown background) or more than one channels among MWI-8 and MWI-14 (related equipment are indicated in blue
background) otherwise the instrument is considered failed.
For this reason a single FEE module (#1, #2, #3, #4, #5 and #6) cannot deliver power to more than one channel of the same
“group” (MWI-1, MWI-2 and MWI-3 or MWI-8 and MWI-14).
Table 8-9: FEE Power supply rail characteristics
R-IFC-RFA-0380-R
The maximum current consumption in any environmental and operative mode for each line
of the power supply rail shall be as follows:
Power
Output
Power supply
+8.8 VDC
+2.5 VDC
+5.5 VDC
+8VDC
-8VDC
Set
[mA]
[mA]
[mA]
[mA]
[mA]
#1
-
[TBD]
[TBD]
[TBD]
[TBD]
#2
-
[TBD]
[TBD]
[TBD]
[TBD]
#3
-
-
[TBD]
[TBD]
[TBD]
#4
100 max
-
-
-
-
[TBC]
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Table 8-10: Max current consumption of the power supply rails
Each gain/offset setting data link shall be composed of 4 lines as follows (this interface is
R-IFC-RFA-0400-R
TBC):
CLOCK
TM/TC
FPGA
DATA
LATCH
LOAD
Offset/ bit 3
Offset / bit 2
Offset / bit 1
Offset / bit 0
Gain / bit 3
Gain / bit 2
Gain / bit 1
Gain / bit 0
MASTER
RESET
FEE
RF receiver
Figure 8-10: Command data link interface diagram
Electrical interface shall be compliant with Errore. L'origine riferimento non è stata
trovata. section 8.8 (RS-422)
R-IFC-RFA-0500-TR
The timing shall be compliant to [TBD].
R-IFC-RFA-0510-TR
The command data update rate is below 0.6 Hz [TBC].
R-IFC-RFA-0410-TR
The RFA shall provide a direct command data link for each noise diode of channels 1-2-3
in order to allow the FEE to switch them on/off.
R-IFC-RFA-0412-TR
The RFA shall provide two telecommand links to set the LO power level of each Down
Converter. It shall be compliant to the scheme shown in the following figure:
LO Power
command #1
TM/TC
FPGA
LO Power
command #2
FEE
RF receiver
Figure 8-11: RFA LO power command data link scheme
Electrical interface shall be compliant with Errore. L'origine riferimento non è stata
trovata. section 8.8 (RS-422)
R-IFC-RFA-0414-TR
The LO power discrete telecommands update rate is below 0.6 Hz [TBC].
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
8.4.3
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CDPU INTERFACE
R-IFC-RFA-0420-R
The RFA electrical interface toward the CDPU shall be composed of the following type of
signals:


R-IFC-RFA-0430-R
Analogue Baseband Video signals,
RF_IF 1.375 GHz.
Interface signals toward the CDPU shall be according to the following table:
Interface
type
Description
Analogue
Video
Earth and
calibration
data
Nom
Red
26
26
Comment
26 channels (see
Frequency
(GHz)
Bandwidth
(MHz)
Polarisation
MWI-1
18.7
200
H&V
MWI-2
23.8
400
H&V
MWI-3
31.4
200
H&V
MWI-4
50.3
400
H&V
MWI-5
52.61
400
H&V
MWI-6
53.24
400
H&V
MWI-7
53.75
400
H&V
MWI-8
89
4000
H&V
MWI-9
118.7503±3.2
2x 500
V
MWI10
118.7503±2.1
2x 400
V
MWI11
118.7503±1.4
2x 400
V
MWI12
118.7503±1.2
2x 400
V
MWI13
165.5±0.725
2x 1350
V
MWI14
183.31±7.0
2x 2000
V
MWI15
183.31±6.1
2x 1500
V
MWI16
183.31±4.9
2x 1500
V
MWI17
183.31±3.4
2x 1500
V
Channel
name
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
MWI18
183.31±2.0
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V
Table 5-1)
IF signal
(1.375 GHz,
[TBC])
MWI-1 H and
V channels for
removing
interference @
18.7 GHz
2
RFI mitigation module is not redundant
Table 8-11: RFA-CDPU electrical interfaces
8.5
EMC REQUIREMENTS
R-IFE-RFA-1035-T
The requirements listed in [AD014] are applicable to the RFA.
R-IFE-RFA-1040-T
The RFA shall be compatible with, and immune to interferences caused by the following
Transmitters / Emitters emitting in the following frequency bands:




Ka band (platform SMD): 25.5 to 27 GHz
X band (platform HR-DDB): 7.750 to 7.900 GHz
L band (platform LR-DDB): 1698.75 to 1709.25 MHz
S band (platform TTC): 2.200 to 2.290 GHz
Derived from R-IFE-1040
R-IFE-RFA-1044
The main characteristics of the Transmitters specified in R-IFE-RFA-1042 are given in the
following tables:
Table 8-12: MetOp-SG on board transmitters RF emission characteristics
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Table 8-13: Characteristics of TT&C, ARGOS-DCS and SCA on board transmitters
Derived from R-IFE-1044
R-IFE-RFA-1046-T
The RFA equipment shall be compatible with the active RF signals received on-board of
MetOp-SG Satellites by the following Receivers:


L band (platform AOCS and RO GNSS Receivers):
o GPS : 1.57542 ( GPS L1 ) and 1.17645 ( GPS L5 ) GHz
o GALILEO : 1.17645 ( GAL E5a ) and 1.57542 ( GAL E1-B/C ) GHz
S band (platform TC Rx): 2.0534 GHz
Derived from R-IFE-1046
8.5.1
BONDING AND GROUNDING
R-IFE-RFA-1100-R
The RFA shall adopt a single point grounding concept.
Typically the bond methods can be classified in two main typologies: direct (metal‐to‐metal)
and indirect. Direct bonding is the preferred one, being the junctions permanently fixed
together without needing additional joints.
Derived from R-IFE-1100
R-IFE-RFA-1102-R
In order to satisfy the electrical conductivity requirements it is sometimes necessary to
bond together dissimilar metals. In order to avoid galvanic corrosion processes, the metals
selection guidelines are contained in [ECSS-Q-70-71A: Data for selection of Space
Materials and Processes; (sect. 5.2.14)]. The galvanic corrosion effects should be carefully
considered also in presence of direct bonding between metals and conductive/partially
conductive fiber‐reinforced materials (e.g. carbon fiber composites).
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Derived from R-IFE-1102
R-IFE-RFA-1104-T
The bond itself shall have an adequate cross section to carry fault currents of 1.5 times the
unit/circuit protection device rating for an in-definite time.
Derived from R-IFE-1104
R-IFE-RFA-1106-T
The DC resistance between two mating metallic structure parts shall be 2.5 mΩ, measured
using the 4-wire method, 1 ADC, both directions of polarity.
Derived from R-IFE-1106
R-IFE-RFA-1108-I
Bond straps shall be designed so that their length-to-width ratio shall not exceed 5:1.
Bonding straps shall preferably be made of silver plated copper braid.
Derived from R-IFE-1108
R-IFE-RFA-1110-I
Thermal blankets shall be grounded, in line with R-IFE-RFA-1100-R.
Each blanket shall be provided with one bonding point to ground for each 0.4 m2 of
exposed surface, minimum two bonding points for each blanket
Derived from R-IFE-1110
8.5.2
CABLE AND HARNESS REQUIREMENTS
R-IFE-RFA-1200-RI
All connectors shall be EMC tight (e.g. by RF tight back-shells) such that the connector
including cabling is completely shielded as soon as the connector is mated with the box
mounted part.
Derived from R-IFE-1200
R-IFE-RFA-1202-T
The DC resistance between the connector receptacle (unit case mounted connector part)
and the unit case shall not exceed 5 mΩ measured with the 4 wire method, 1 ADC, both
directions of polarity.
Derived from R-IFE-1202
R-IFE-RFA-1204-I
All cable bundles shall be routed as close as possible to the structure, ground plane and
ground rail respectively, in order to reduce the common mode noise.
Derived from R-IFE-1204
R-IFE-RFA-1206-R
Physical separation along common runs of EMC classes listed below (Table 8-14) shall be
retained up to and inclusive of the module interface connectors. When this is not feasible,
exceptions shall approved by the customer. As a minimum, power, signals, and telemetry
shall be separated in a connector by a set of unused pins, in order to avoid failure
propagation.
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
EMC Class
Interface Type
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Cable Type
Primary Power Lines
1
Secondary Power Lines
Twisted pair
Motor Supply Lines
2
Command/Control Lines
Twisted pair
3
Analogue Command/Sensor Lines
Screened Twisted pair
4
Mechanisms/Pyros
Screened Twisted pair
Digital Data/Bus
Low Voltage Differential Signals
Screened Twisted pair (Z0 according
to signal type)
RF Signals
Coaxial
5
6
Table 8-14: Cables EMC classification
Derived from R-IFE-1206
8.5.3
CIRCUITS REQUIREMENTS
R-IFE-RFA-1300-R
EMI filters shall be used in equipment to reduce conducted emissions and susceptibility.
Derived from R-IFE-1300
R-IFE-RFA-1302-T
Electromagnetic interference safety margins are mandatory and shall be determined for
critical signals. A minimum acceptable safety margin is to be achieved and shall be:
6 dB for power and signal circuits.
Derived from R-IFE-1302
R-IFE-RFA-1304-R
In cases where the required minimum systems margins are not met between emissions
and susceptibility for either power or signal circuits threshold shall be determined on
system, equipment, or component level. This data shall be submitted in support of any
RFW/NCR application.
Derived from R-IFE-1304
8.5.4
STATIC CHARGING
R-IFE-RFA-1400-T
The DC resistance of all metallic parts to RFA structure shall be in all cases lower than 100
kΩ to prevent static charging.
Derived from R-IFE-1400
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-IFE-RFA-1402-T
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Any space exposed surface or surface coating of the RFA, shall be conductive and
grounded to satellite structure.
Derived from R-IFE-1402
R-IFE-RFA-1404-T
All space exposed surfaces (Coatings; Finishes; Foils; External layers of thermal blankets)
shall be conductive and shall be provided of straps to be grounded to satellite structure.
Derived from R-IFE-1404
R-IFE-RFA-1406-I
Any cable of the RFA electrically exposed outside the main spacecraft body shall be
protected/filtered to prevent damage to the related electronic equipment.
Derived from R-IFE-1406
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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9. GENERAL DESIGN AND INTERFACE REQUIREMENTS
9.1
GENERAL DESIGN REQUIREMENTS
This section contains requirements relating to:

Venting

Parts, material and process

Engineering standards

Handling, packing and transportation

Reliability, availability, maintainability, safety

Identification and marking

Workmanship
Note: Product Assurance (PA) requirements specified in [AD14] are applicable. However, descriptive PA issues
may be found within this document.
9.1.1
LIFETIME
R-DES-RFA-0010
The requirements of [AD13b] §3.1.1 apply; see also next requirements.
R-DES-RFA-0020-RT Witness samples shall be provided for all the process/hardware used on the RFA that can
be sensitive to long storage (i.e.: structural bonding, adhesives, coatings, surface
treatments, etc.) in order to be stored with the instrument in the same condition. A periodic
testing/inspection of these samples shall be defined and agreed with the customer in order
to confirm that no degradation in the process/hardware storage sensitive items occurred.
R-DES-RFA-0030-R
Life limited items shall be avoided as far as
R-DES-RFA-0035-RAT
Mechanical and electrical/electronic design choices shall be compatible with the
long term storage requirement
9.1.2
DESIGN SAFETY
R-DES-RFA-0040-R
The RFA shall be designed and fabricated with compatible materials in such a manner that
all hazards associated with the RFA are eliminated, minimised and controlled.
R-DES-RFA-0050
The requirements of [AD13b] §3.1.2 apply in addition to above requirements
9.1.3
DEPENDABILITY AND SAFETY
R-DES-RFA-0055
9.1.4
VENTING
R-DES-RFA-0060
9.1.5
The requirements of [AD13b] § 3.1.3 apply
The requirements of [AD13b] § 3.1.3 apply
IDENTIFICATION & MARKING
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-DES-RFA-0110-I
The RFA shall be identified with a nameplate in order to achieve configuration traceability.
The identification shall contain the following information:
• Name Of Manufacturer
• Project Name
• Part Number
• Serial Number
• Date Of Manufacture
Each Individual unit shall be marked with a serial number. For standard parts and where
the physical size of an item precludes identification of the hardware itself, a 'bag and label’
technique shall be used (up to final integration).
R-DES-RFA-0120-I
The unit identification nameplate shall be mounted on the connector face, visible when
installed on the unit. Its location shall be noted on the ICD. The identification shall be
legible with unaided eye from 0.5m distance. The identification label shall meet all the
requirements relevant to the unit.
R-DES-RFA-0130
The requirements of [AD13b] § 3.1.6 apply in addition to the above requirements
9.1.6
ACCESSIBILITY/MAINTAINABILITY
R-DES-RFA-0140
The requirements of [AD13b] § 3.1.6 apply; see also next requirements
R-DES-RFA-0150-R
In case specific operation (de-storage procedure) has to be carried out after long term
storage, these shall be agreed with the customer and notify it into the User’s Manual.
R-DES-RFA-0151-R
In case periodic maintenance operations (mechanical/electrical relying/functional) are
needed during long term storage, these shall be agreed with the customer and notify it into
the User’s Manual
R-DES-RFA-0152-R
For periodic testing and de-storage activities need for CA the instrument accessibility both
hardware accessibility and EGSE ports connection shall be agreed with the customer and
identified in the User’s Manual.
R-DES-RFA-0160-R
No field maintenance, servicing or adjustment shall be required within six months from
launch (launch window shifts included).
9.1.7
9.1.7.1
TRANSPORTATION, HANDLING AND STORAGE
TRANSPORT
R-DES-RFA-0170
The requirements of [AD13b] §3.1.8.1 apply; see also next requirements
R-DES-RFA-0190-RI
During long term storage the RFA shall be stored under the following conditions:
• Pressure: 250 mbar to 1050 mbar
• Temperature:20°C ± 10°C
• Humidity: 45% ± 15% or dry GN2 atmosphere
• Cleanliness: Class 100,000 or better
9.1.7.2
UNIT PACKING
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-DES-RFA-0200-I
Where applicable blanking caps shall be fitted to any ports. Blanking caps shall be labelled
and instructions included in the Handling and Transportation Procedures, to 'Remove
Before Flight or Test' as applicable.
R-DES-RFA-0210
The requirements of [AD13b] §3.1.8.2 apply in addition to the above requirement
9.1.7.3
CONTAINER IDENTIFICATION
R-DES-RFA-0220
9.1.7.4
R-DES-RFA-0240
9.1.7.5
The requirements of [AD13b] §3.1.8.3 apply
HANDLING
The requirements of [AD13b] §3.1.8.4 apply
SEALS
R-DES-RFA-0250-R
Any seals used shall comply with all the applicable requirements of this specification,
particularly regarding propellant and simulant compatibility and out-gassing.
R-DES-RFA-0260
The requirements of [AD13b] §3.1.9.2 apply in addition to the above requirement
9.1.7.6
LUBRICANTS AND SEALANTS
R-DES-RFA-0270
9.1.7.7
SCREW LOCKING
R-DES-RFA-0280
R-DES-RFA-0290-R
9.1.7.8
The requirements of [AD13b] §3.1.9.3 apply
The requirements of [AD13b] §3.1.9.4 apply; see also next requirements
All screw type hardware used on the unit shall be locked by adequate measures
GROUND SUPPORT EQUIPMENT
R-DES-RFA-0291
The requirements of [AD13b] §3.1.10 apply; see also next requirements
R-DES-RFA-0292
The requirements of [AD13b] §3.5.8.2.5.4 apply to EGSE interfaces to Flight H/W
9.2
MECHANICAL DESIGN AND CONSTRUCTION REQUIREMENTS
9.2.1
GENERAL REQUIREMENT
R-DES-RFA-0300-R
All drawings, specifications and engineering data shall only use the International System of
Units (SI units), with the exception of
 accelerations which may be expressed in terms of multiples of g (gravity);
 temperatures which may be expressed in degrees Celsius;
 accelerations which may be expressed in degrees.
R-DES-RFA-0310-R
Units shall be compliant with ECSS-E-ST-03A (Testing), and shall be compatible with
mechanical testing.
R-DES-RFA-0320-I
Following testing the unit shall be inspected to confirm the absence of physical damage.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
9.2.2
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YELD AND ULTIMATE LOADS
R-DES-RFA-0330-A
The RFA structure shall be able to withstand the yield levels (limit load multiplied by the
yield safety factor) without showing elastic or plastic deformation that will adversely affect
the RFA performance.
[Source: MOS.SP.ASF.SYS.00816 Iss.1 Rev.1 (INS-GDIR), requirement GDIR_R-STR0030]
R-DES-RFA-0340-A
The RFA structure shall be able to withstand the ultimate load levels (limit load multiplied
by the ultimate safety factor) without rupture, collapse or permanent deformations that
impact the integrity of other parts or the system performance.
[Source: MOS.SP.ASF.SYS.00816 Iss.1 Rev.1 (INS-GDIR), requirement GDIR_R-STR0040]
9.2.3
MARGINS OF SAFETY
R-DES-RFA-0350-A
The RFA structure safety margins will be as per [AD13b]. Positive margins shall be
demonstrated by strength analysis after application of the relevant safety factors (yield and
ultimate) for all worst-case loads.
[Source: MOS.SP.ASF.SYS.00816 Iss.1 Rev.1 (INS-GDIR), requirement GDIR_R-STR0040]
R-DES-RFA-0360-A
The derivation of Design Limit Load starting from Qualification loads shall consider the
factors and the relationships that are shown in [AD13b].
[Source: MOS-RS-ESA-SYS-0433 (MOS GDIR), requirement R-STR-0080]
9.2.4
QUASI-STATIC DESIGN LOAD
R-DES-RFA-0370-R
The quasi-static acceleration that shall be considered in the design is 15 g. The quasi-static
loads shall be applied at the centre of mass of the RFA, acting along the worst spatial
direction with respect to the resulting reactions and with the loads in the different axes not
acting simultaneously.
[Source: MOS.SP.ASD.SATB.0580 Iss.1 Rev.5draft (MWI_TRS), requirement TRS_R-MWI-1231-RT]
9.3
ELECTRICAL DESIGN AND CONSTRUCTION REQUIREMENTS
Electro Magnetic Compatibility requirements contained in [AD20] are applicable
9.3.1
9.3.1.1
CONNECTORS GENERAL DESIGN REQUIREMENTS
HARNESS
R-DES-RFA-0380-IR
Cables falling into different EMC classifications shall be assembled to different (separate)
cable bundles and connectors. If this is not feasible and wires of different classifications
use the same connector, the separation shall be implemented by a row of grounded pins in
between.
R-DES-RFA-0390-IR
All cable bundles shall be routed as close as possible to the structure ground plane/ground
rail respectively, in order to reduce the common mode noise.
R-DES-RFA-0400-IR
In wiring through connectors all leads shall be kept as close as possible to their return (i.e.
twisted wires shall be routed on adjacent pins), to obtain good self cancellation and to
minimize the wire loop.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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R-DES-RFA-0410-T
The DC resistance between the single cable shield and the shield ground point (at the
connector, unit case, PCB or intermediate points) shall be ≤ 10 mΩ.
R-DES-RFA-0420-IR
The structure termination of shields shall be made via connector housing. When multiple
shielding is used, each shield shall be grounded separately.
9.3.1.2
CONNECTOR TYPES
R-DES-RFA-0430-R
All connectors mounted on the CA shall be D*MA** connectors.
R-DES-RFA-0440-RI
All flight connectors shall be designed to withstand without damage at least 55 mate /
demate cycles.
R-DES-RFA-0450-R
Individual mate/demate shall be recorded in a mate/demote log.
R-DES-RFA-0460-R
The number of times flight connectors are mated / demated before delivery shall not
exceed 5, except by prior agreement with S/C Prime.
R-DES-RFA-0470-RI
If by prior agreement with S/C Prime the number of mate / demate is to exceed 5, then
visual inspection of the connectors and connector contacts shall be performed after every 5
mate / demate and the results of the inspection shall be recorded in the mate / demate log.
9.3.2
BONDING
R-DES-RFA-0480-R
Bonding is the method by which adjacent conductive elements are electrically connected in
order to minimise any potential differences and flow of electrical currents. In order to avoid
galvanic corrosion processes, the metals selection guidelines are contained in [ECSS-Q70-71A: Data for selection of Space Materials and Processes; (sect. 5.2.14)]. The galvanic
corrosion effects should be carefully considered also in presence of direct bonding
between metals and conductive/partially conductive fibre‐reinforced materials (e.g. carbon
fibre composites).
Derived from R-IFE-1102
R-DES-RFA-0490-R
The bond shall be resistant against corrosion and shall have an adequate cross section to
carry fault currents of 1.5 times the unit/circuit protection device for an indefinite time.
Derived from R-IFE-1104
R-DES-RFA-0500-T
Metallic parts of each electrical equipment chassis (case) shall be mutually bonded
together by direct metal contact (preferred method) or bonding strap. Bonding interfaces
shall be designed to achieve a contact resistance of 2.5 mΩ or less per bonding junction
(including strap, if used).
R-DES-RFA-0510-RI
Joint faces shall be flat and clean before assembly; the only permitted surface finishes for
joint faces are (preference order):
• alodine 1200 for aluminium alloys,
• clean metal except for Aluminium alloys.
R-DES-RFA-0520-T
All non-electrical equipment shall be bonded to the structure by direct metallic contact with
less than 1kΩ.
R-DES-RFA-0530-T
Metallic receptacles of connectors shall be electrically bonded to the equipment case with a
DC resistance of 2.5mΩ or less. The DC resistance between a connector backshell and the
connector body shall be 2.5mΩ or less.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
9.4
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THERMAL DESIGN AND CONSTRUCTION REQUIREMENTS
R-DES-RFA-0540-A
The RFA thermal design shall comply with the requirements of [AD22].
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
10.
ENVIRONMENT REQUIREMENTS
10.1
GENERAL
R-AIV-CA-0005-R
AD26.
10.2
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The CA shall be integrated, verified, characterized in agreement with AD23, AD24, AD25,
GROUND ENVIRONMENT
R-ENV-RFA-0010-R
The RFA shall be able to withstand, without degradation of performance and reliability, all
environments – as specified in [AD13a] GDIR_R-ENV-0020 – during assembly, ground
testing and calibration, storage and transportation.
Derived from [AD13a] GDIR_GDIR_R-ENV-0010
R-ENV-RFA-0015-R
RFA Supplier shall provide:


An RFA Cleanliness and Contamination Control Plan, defining the measures and
methods used at Instrument level to prevent contamination,
An RFA level Contamination Budget, quantifying the Instrument contamination levels
resulting from the MAIV operations at RFA level, before delivery to the Satellite Prime
Supplier.
Derived from [AD13a] GDIR_R-ENV-0022
R-ENV-RFA-0020-R
Assembly, ground testing and calibration, transportation and storage environmental
conditions shall be as specified in Errore. L'origine riferimento non è stata trovata.,
Errore. L'origine riferimento non è stata trovata., ECSS-Q-20-07A, PSS-01-202 issue 1.
Derived from [AD13a] GDIR_R-ENV-0030
R-ENV-RFA-0022-R
The RFA shall withstand the on-ground operations environment specified in Table 10-1.
Table 10-1: On Ground Operations Environment
Derived From [AD13a] GDIR_R-IFM-1105
R-ENV-RFA-0024-R
The RFA shall withstand the on-ground operations and handling loads specified in Table
10-2.
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Table 10-2: On Ground Operations and Handling Loads
Derived From [AD13a] GDIR_R-IFM-1110
R-ENV-RFA-0026-A
The first eigen-frequency of the RFA shall be higher than 60 Hz.
Derived From R-IFM-1130
R-ENV-RFA-0028-A
The analytically predicted first eigen-frequency of the Instruments shall be at least 15%
higher than the minimum specified requirement (See R-ENV-RFA-0026) before any modal
survey / coupled loads analysis results are available.
Derived From R-IFM-1140
10.2.1 GROUND HANDLING, TRANSPORTATION AND STORAGE
R-ENV-RFA-0040-R
During long-term storage, the RFA shall be kept in an environmentally controlled and
monitored container with dry GN2.
Derived from [AD13a] GDIR_R-ENV-0045
R-ENV-RFA-0050-R
The storage and de-storage needs of the RFA (both at assembly level and at instrument
level) and associated requirements shall be established by the entity responsible for
maintaining the integrity of the performances and reliability.
Derived from [AD13a] GDIR_R-ENV-0050
R-ENV-RFA-0060-R
For long term storage of RFA, the Instrument Supplier shall define and specify:



Storage conditions ( Container ; Cleanliness ; Purging ; … ),
Regular maintenance and verification activities ( typically once a year ),
Accessibility requirements and constraints.
Derived from [AD13a] GDIR_R-ENV-1010
10.2.2 VERIFICATION AND TESTING
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-ENV-RFA-0070-R
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The ground tests, their definition, the applicable environmental levels, as well as the
underlying rationale shall be derived from the predicted conditions during launch and inorbit suitably factored for qualification and acceptance.
Derived from [AD13a] GDIR_R-ENV-0080
R-ENV-RFA-0080-R
The RFA and its associated Ground Support Equipment (GSE) shall be designed to
withstand without any performance and reliability degradation the tests to be performed on
ground.
Derived from [AD13a] GDIR_R-ENV-0090
10.3
LAUNCH ENVIRONMENT
R-ENV-RFA-0090-TA The RFA shall be able to withstand, without degradation of performance and reliability, all
environments during pre-launch activities, launch and ascent.
10.4
SPACE ENVIRONMENT
10.4.1 VACUUM
R-ENV-RFA-0100-A
The RFA shall be designed with sufficient venting holes and area to withstand the
depressurisation profile during the launch ascent phases.
Derived from [AD13a] GDIR_R-ENV-0110
R-ENV-RFA-0110-A
The RFA shall be manufactured according to the following pressure requirements:




Inside transportation containers and inside integration- and launch site preparation
facilities: ambient + 1 mbar
During storage: ambient
During launch: pressure transition from 105 Pa to 1 Pa within 80 sec during ascent
In orbit: vacuum of 10-7 Pa over its lifetime
R-ENV-RFA-0120-T
The operating temperature shall be in the range: - [TBD] °C to + [TBD] °C.
R-ENV-RFA-0130-T
°C.
The non-operating temperature range shall be comprised between - [TBD] °C to + [TBD]
10.4.2 ENVIRONMENTAL TEST
R-ENV-RFA-0150-T
The RFA shall be tested in sinusoidal, random, acoustic and shock environments.
For what concerns the random tests for the RFA, the acoustic loads are expected to be the
dimensioning loads, due to the type of structure; therefore the baseline includes acoustic
tests, which are expected to envelope random vibrations. Nevertheless, actual random
loads shall be verified by analysis and the worst case between acoustic and random
vibration loads shall be verified by test.
For what concerns the shock test for the RFA, this kind of test shall be performed only at
instrument level.
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SPECIFICATION
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R-ENV-RFA-0160-TA The RFA shall be designed to withstand the sine vibration loads given in the following
tableErrore. L'origine riferimento non è stata trovata.. The given sine loads are:
qqualification level, to be applied by single axis, to all axis.
Table 10-3: Sine Vibration Qualification Spectrum applicable to RFA
[Source: MOS.SP.ASD.SATB.0580 Iss.1 Rev.5draft (MWI_TRS), requirement TRS_RMWI-1232-TA]
R-ENV-RFA-0170-TA The RFA shall be designed to withstand the random vibration loads given in in the following
tableErrore. L'origine riferimento non è stata trovata.. The given random loads are
2
defined as Power Spectral Density (PSD, in g /Hz): qualification level, to be applied by
single axis and to all axis for duration of 120 s per axis.
For applicability at the interface of the RFA and to account for the transfer function, the
levels presented in the following table shall be increased by a factor of 1.5 as the value to
be applied for RFA qualification.
Overall: 4.94 gRMS
Table 10-4: Random Vibration Qualification Spectrum applicable to RFA
[Source: MOS.SP.ASF.SYS.00816 Iss.1 Rev.1 (INS_GDIR), requirement GDIR_R-IFM1170]
R-ENV-RFA-0180-TA The RFA shall be designed to withstand the shock loads given in the following table:
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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CA Qualification Shock Loads Spectrum
Loads
[g]
1000
QUALIFICATION
SHOCK LEVELS
100 Hz – 20 g
270 Hz – 100 g
2000 Hz – 500 g
10000 Hz – 400 g
100
10
100
1000
10000
Frequency
[Hz]
Table 10-5: Shock qualification loads
[Source: MOS.SP.ASD.SATB.0580 Iss.1 Rev.5draft (TRS), requirement TRS_R-MWI1233]
R-ENV-RFA-0190-TA The RFA shall be designed to withstand the acoustic loads given in the following figure
(qualification levels).
CA Qualification Acoustic Vibration Spectrum
145
140
Acoustic loads
[dB]
31.25
62.5
125
250
ACOUSTIC
FIELD
[dB]
131
136
139
141
FREQ
[Hz]
135
130
125
120
115
10
100
1000
10000
Frequency
[Hz]
500
137
1000
129
2000
124
4000
122
Figure 10-1: Acoustic Vibrations Qualification Spectrum
[Source: MOS.SP.ASF.SYS.00816 Iss.1 Rev.1 (INS-GDIR), requirement GDIR_R-IFM1180]
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RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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10.4.3 NATURAL ELECTROMAGNETIC RADIATION AND INDICES
R-ENV-RFA-0210-R
The natural electromagnetic radiation environment specified in Section 6.2.1 of [RD08]
shall be used. Where estimated solar and geomagnetic indices are used the reference
values specified in Section 6.2.2, tailored according to Section 6.2.3 of [RD08], shall be
applicable.
Note: The Supplier should pay attention to the Note attached to 6.2.3 d, since the new
Solar Cycle 24 appears to be starting slowly.
Derived from [AD13a] GDIR_R-ENV-0150
10.4.4 NEUTRAL ATMOSPHERE
R-ENV-RFA-0220-R
The atmospheric density models specified in Section 7.2.1 of [RD08] shall be used,
following the guidelines given therein for model selection.
Note: Alternative models of the neutral atmosphere may be used if justified by the
Contractor and agreed by the Customer.
Derived from [AD13a] GDIR_R-ENV-0160
10.4.5 PLASMA
R-ENV-RFA-0230-R
The ionosphere plasma environment specified in Section 8.2.2 of [RD08] shall be
applicable to the RFA design.
Derived from [AD13a] GDIR_R-ENV-0170
R-ENV-RFA-0240-R
The aurora charging environment specified in Section 8.2.3 of [RD08] shall be applicable to
the RFA design.
Derived from [AD13a] GDIR_R-ENV-0180
10.4.6 ENERGETIC PARTICLE RADIATION
R-ENV-RFA-0250-R
The trapped energetic particle radiation, solar particles and galactic cosmic rays specified
in Section 9.2 of [RD08] shall be applicable to the RFA design.
An initial assessment of the radiation environment at the reference orbit can be found in
[AD20]
Derived from [AD13a] GDIR_R-ENV-0190
10.4.7 SPACE DEBRIS AND METEOROIDS
R-ENV-RFA-0260-R
The external surfaces of the RFA shall be specified taking the flux of space debris and
micrometeoroids defined by the models specified in Section 10.2 of [SDS04] into account
Derived from [AD13a] GDIR_R-ENV-0200
10.4.8 ATOMIC OXYGEN
R-ENV-RFA-0270-R
The atomic oxygen environment specified in of [SDS04] shall be used.
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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Derived from [AD13a] GDIR_R-ENV-0210
R-ENV-RFA-0280-R
The external surfaces of the RFA shall be specified taking the flux of atomic oxygen
defined by the models specified in Appendix G of [SDS04] into account.
Derived from [AD13a] GDIR_R-ENV-0220
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
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MOS-RS-CGS-MWI-0006
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11.
ASSEMBLY, INTEGRATION AND VERIFICATION REQUIREMENTS
11.1
GENERAL
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AIV is defined as all the processes in the life cycle of equipment leading from assembly of components to the
verification of equipment performance at P/L level.
11.2
ASSEMBLY AND INTEGRATION
R-AIV-RFA-0010-R
Assembly and integration shall be planned to ensure accomplishment of the schedule and
efficient use of resources along the development.
Derived from [AD13a] GDIR_R-AIV-0010
R-AIV-RFA-0020-R
The RFA shall be assembled and integrated in agreement with AD12
R-AIV-RFA-0030-R
The integration flow shall minimise the number of models and test drivers compatible with
the overall development plan.
Derived from [AD13a] GDIR_R-AIV-0030
R-AIV-RFA-0040-R
The design shall allow for easy access to equipment during AIV. Skin test connectors and
test points shall be provided.
Derived from [AD13a] GDIR_R-AIV-0040
R-AIV-RFA-0045-R
AIT activities shall monitor, control and minimize equipment contamination.
Derived from [AD13a] GDIR_R-AIV-0045
R-AIV-RFA-0050-T
The integrity of all interfaces, which are mated/de-mated during AIV for integration or
replacement of units or for tests, shall be verified by test.
Derived from [AD13a] GDIR_R-AIV-0050
11.3
VERIFICATION REQUIREMENTS
R-AIV-RFA-0060-R
Prior to integration to P/L, the RFA equipment shall be verified and operationally validated.
A verification control document shall provide evidence of the verification results and
fulfilment of the pass criteria.
Derived from [AD13a] GDIR_R-AIV-0060
R-AIV-RFA-0070-R
The overall test and verification programme shall be endorsed by the Customer.
Derived from [AD13a] GDIR_R-AIV-0070
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-AIV-RFA-0075-R
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The RFA shall be verified and tested in agreement with AD25 and AD26
R-AIV-RFA-0080-R
The AIV programme shall be compliant with Errore. L'origine riferimento non è stata
trovata.SDS02] and Errore. L'origine riferimento non è stata trovata.SDS03].
Derived from [AD13a] GDIR_R-AIV-0080
R-AIV-RFA-0090-R
All RFA functions shall be verified by review-of-design, similarity, analysis, simulation, test
or combinations thereof. The methods are listed by increasing order of priority.
Derived from [AD13a] GDIR_R-AIV-0090
R-AIV-RFA-0100-R
The end-to-end verification of the RFA shall preferably be done by test and by operating
the elements in a configuration fully representative for the intended functions.
Derived from [AD13a] GDIR_R-AIV-0100
R-AIV-RFA-0110-A
Verification methods based on simulations rather than testing may be applied only when
significant cost savings can be demonstrated, or ground tests are assessed as unfeasible,
and shall be accepted by the Customer.
Derived from [AD13a] GDIR_R-AIV-0110
R-AIV-RFA-0120-R
The equipment simulators shall provide high fidelity functions to allow the verification of any
Equipment functions in a realistic environment.
Derived from [AD13a] GDIR_R-AIV-0120
R-AIV-RFA-0130-R
The verification program shall cover all performance of equipment and its interface (mass,
dimensions, etc.) parameters.
Derived from [AD13a] GDIR_R-AIV-0130
R-AIV-RFA-0140-R
All prime and redundant functions of the RFA shall be verified independently.
Derived from [AD13a] GDIR_R-AIV-0140
R-AIV-RFA-0150-T
Operational interfaces shall be verified by test.
Derived from [AD13a] GDIR_R-AIV-0150
R-AIV-RFA-0170-R
The RFA design shall provide for in-orbit verification and calibration.
Derived from [AD13a] GDIR_R-AIV-0170
R-AIV-RFA-0200-R
The verification programme shall demonstrate that the equipment meets the performance
requirements under the specified environments.
Derived from [AD13a] GDIR_R-AIV-0200
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-AIV-RFA-0210-R
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The verification programme shall cover all performance parameters in a hierarchical
structure such that all the mission objectives, broken-down to lower levels, can be fully
traced.
Derived from [AD13a] GDIR_R-AIV-0210
R-AIV-RFA-0220-R
Verification shall be performed hierarchically and exhaustively at each level of
specification, without omissions, and therefore without assuming that the next upper level
of verification can properly address not verified lower level requirements.
Note: This will improve early detection and correction of non conformance, avoiding
impacts to the programme at later stage when resolving the problem will be more complex
and costly.
Derived from [AD13a] GDIR_R-AIV-0220
R-AIV-RFA-0240-R
Standard verification procedures and configurations shall be used at all levels of integration
to ensure repeatability and reproducibility.
Derived from [AD13a] GDIR_R-AIV-0240
11.4
CALIBRATION
R-AIV-RFA-0320-R
The performances of the RFA shall be fully characterized.
R-AIV-RFA-0325-R
The RFA shall characterized and calibrated in agreement with AD23 and AD26
R-AIV-RFA-0330-R
The RFA shall be calibrated and the measurements shall be traceable.
R-AIV-RFA-0340-R
The characterisation, calibration records and information shall be stored.
R-AIV-RFA-0360-R
Calibrated and commissioned reference validated tools and systems shall be used for the
verification of the performances of the RFA.
R-AIV-RFA-0370-R
Reference validated tools shall be used for the investigation of anomalies and verifications
of fixes.
11.5
GROUND SUPPORT EQUIPMENT
R-GSE-RFA-0010-R
The GSE shall be designed and manufactured to support the MWI programme throughout
its lifetime including the in-flight operations.
Derived from [AD13a] GDIR_R-GSE-0010
R-GSE-RFA-0020-R
The GSE shall include all hardware and software necessary to support the AIV activities.
Derived from [AD13a] GDIR_R-GSE-0020
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
R-GSE-RFA-0030-R
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The GSE shall permit functional testing to demonstrate flight readiness of the integrated
equipment.
Derived from [AD13a] GDIR_R-GSE-0030
R-GSE-RFA-0050-R
The GSE shall be compatible with the ground facilities as required, including compliance to
all applicable safety regulations.
Derived from [AD13a] GDIR_R-GSE-0050
R-GSE-RFA-0060-R
The GSE design shall take into account the requirements of the AIV facilities as
appropriate.
Derived from [AD13a] GDIR_R-GSE-0060
11.5.1 EGSE
R-GSE-RFA-0070-R
The Electrical GSE (EGSE) shall support the integration and testing of the RFA.
Derived from [AD13a] GDIR_R-GSE-0070
R-GSE-RFA-0130-R
The EGSE shall support end-to-end equipment tests, listen in and instrument data
recording.
Derived from [AD13a] GDIR_R-GSE-0130
R-GSE-RFA-0160-R
The EGSE shall provide the stimuli to



Support AIV
Verify the functionality and performance of RFA
Calibrate and characterise the RFA
Derived from [AD13a] GDIR_R-GSE-0160
11.5.2 MGSE
R-GSE-RFA-0190-I
The MGSE shall include the equipment needed for transport, handling and storage of the
RFA.
Derived from [AD13a] GDIR_R-GSE-0190
11.5.3 FACILITIES
R-GSE-RFA-0210-R
Equipment end-to-end verification during payload thermal vacuum testing shall be
performed to the extent feasible within the given constraints of European Test Facilities.
Derived from [AD13a] GDIR_R-GSE-0210
R-GSE-RFA-0220-R
Special facilities, if needed shall be early identified.
Derived from [AD13a] GDIR_R-GSE-0220
R-GSE-RFA-0230
The use of a particular facility shall in no way result in unacceptable degradation of the
test-article or invalidation of the verification results.
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MetOp-SG MWI
RADIO FREQUENCY ASSEMBLY (RFA)
SPECIFICATION
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0006
Ediz.:
Issue:
04
Data:
Date:
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Derived from [AD13a] GDIR_R-GSE-0230
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