Summary of the JWST
Integrated Science Instrument Module (ISIM)
Systems Requirements Reviews (SRRs)
for
Flight Software (FSW)
and
Command & Data Handling (ICDH)
Sub-Systems
Jerry Kriss
06/17/2004
TIPS/JIMS 6/17/04
TIPS/JIM
1/15
ISIM Overview
ISIM is:
• The JWST Science Instruments
• Associated Infrastructure: Structure, C&DH, & FSW
Region 1
Science Instrument Optics Assemblies
Near Infrared Camera (NIRCam)
Near Infrared Spectrometer (NIRSpec)
Mid Infrared Instrument (MIRI), & Dewar
Fine Guidance Sensor and Tunable Filter (FGS/TF)
Optical Bench Structure
Radiators and support structure (NGST supplied)
Region 2
Focal Plane Electronics (FPE)
Instrument Control Electronics (ICE, MCE, DCE)
Region 3
ISIM Command & Data Handling (ICDH) Electronics
(FSW runs on the Single-Board Computer in this system)
FGS C&DH Electronics
06/17/2004
TIPS/JIM
2/15
JWST System Constituents
System
System
Segment
Segment
Element
Element
JWST System
Observatory
Ground
Launch
Optical Telescope
Element (OTE)
Science and
Operations Center
Launch
Vehicle
Spacecraft (SC)
Institutional Systems
Payload Adapter
Integrated Science
Instrument Module
(ISIM)
Common
Systems
Launch Site
Services
NIRCam
Subsystem
Subsystem
(within
(within ISIM)
ISIM) Structure
06/17/2004
NIRSpec
MIRI
FGS/TF
Thermal
IC&DH
Flight SW
TIPS/JIM
Harnessing
3/15
ISIM Requirements Flow
Environmental Req’s
for the JWST Observatory
JWST-SPEC-003149 EV
Segment
Element
JWST Observatory
Specification
JWST-SPEC-002020
OBS
¸
Fault Protection
Requirements Allocation Document
JWST-RQMT-002450
FP
¸
Mission Assurance Requirements
For the JWST Instruments
JWST-RQMT-002363
¸
ISIM Requirements
Document
JWST-RQMT-000835
MAR
ISIM
ESA JWST Product Assurance
Requirements Document
ESA-JWST-RQ-64
¸
ISIM to OTE and
Spacecraft IRD
JWST-IRD-000640
ISIM to OTE and IOS-IR
JWST-ICD-001831
¸
JWST-ICD-000728
¸
¸
NIRSpec IRD
JWST-IRD-000781
ISIM to OTE and INSU
INCC
JWST-ICD-000729
•EMC Control Plan; JWST-PLAN-002449.
•Flight Observatory to Ground Segment IRD;
JWST-CCR-000106.
•The Radiation Environment for the JWST;
(JWST-RPT-000453).
•ISIM FSW Requirement Document; JWSTRQMT-002101.
•ISIM 1553B Data Bus Specification; JWSTSPEC-002093.
CSA Performance Assurance
Requirements CSA-TBD
NIRCam IRD
JWST-IRD-003272
ISIM to OTE and INCU
IOSC
Other related documents reviewed:
MIRI IRD
JWST-IRD-000782
ISIM to OTE and IMU
INSC
JWST-ICD-000730
IMC
FGS IRD
JWST-IRD-000783
ISIM to OTE and
JWST-ICD-000727
IF
IFC
Subsystem
NIRCam Functional
Requirements Document
JWST-SPEC-002049
NRC
NIRSpec Functional
Requirements Document
JWST-SPEC-002060
NRS
ISIM Structure Requirements
JWST-RQMT-002087
IS
06/17/2004
MIRI Functional
Requirements Document
JWST-SPEC-002063
MIR
ISIM Thermal Control
Subsystem Requirements
JWST-RQMT-003274
ISIM Flight
Software Requirements
JWST-RQMT-002101
IFSW
ITCS
TIPS/JIM
FGS Instrument Performance
and Functional Requirements
JWST-SPEC-002069
FGS
ICDH Requirements
JWST-RQMT-000743
ICDH
4/15
ICDH & FSW SRR Objectives & Scope
´ Objectives:
• Confirm that sub-system-level requirements meet the mission
objectives
• Validate that the architecture concepts can support the performance,
interface, environmental, and product assurance requirements
• Confirm that the preliminary designs are ready to proceed
´ Scope
• Reviews are at the ICDH and FSW Sub-system Level
• Code 560 Peer Review for ICDH
• Code 582 Peer Review for FSW
06/17/2004
TIPS/JIM
5/15
ICDH Subsystem Top Level Summary
´ Hosts the ISIM Flight Software
• Executes the Observation Plan Executive (OPE) for the Observatory
• Performs Target Acquisition
• Manages Command execution, distribution, and telemetry collection
´ Performs the Command and Data Handling Functions for the NIRCam,
NIRSpec, and MIRI instruments.
•
•
•
•
•
Command distribution
Science Data Collection
Telemetry Collection
Performs science data processing for NIRCam, NIRSpec, and MIRI
Performs science data formatting and compression for storage on the
Spacecraft on the Solid State Recorder
´ Interfaces to the Spacecraft Command and Telemetry Processor (CTP)
for Commanding and Telemetry
´ Interfaces to the Spacecraft Solid State Recorder (SSR) for Science
Data Storage
06/17/2004
TIPS/JIM
6/15
SPACECRAFT
PRIMARY POWER
(SWITCHED)
TOWER
ISIM Electrical Interface Overview
ISIM
Region 3
EPU
CTP
SpaceWire
SSR
SpaceWire
NIRCam
SpaceWire
FPE
MODULE A
SpaceWire
FPE
MODULE B
ISIM
MIL-STD1553B
ICDH
SpaceWire
Region 2
SpaceWire
SpaceWire
ICE
NIRSpec
S/C
MIL-STD-1553B
06/17/2004
UAz
JPL/ESA
ESA
CSA
OPTICAL ASSEMBLY
MECHANISMS
MCE
MSA
OPTICAL ASSEMBLY
FPE
FPA
ICE
MECHANISMS
FPE/ICE
NGST
MECHANISMS
ICE
FGS
FGS
C&DH
FPA
MODULE A
FPA
MODULE B
FPA
DCE
RS-422 (TBR)
OPTICAL ASSEMBLY
FPE
MIRI
SpaceWire
Region 1
FPE/ICE
FPE/ICE
/TCE
DEWAR
OPTICAL ASSEMBLY
GUIDER 1 FPA/
MECHANISMS
GUIDER 2 FPA/
MECHANISMS
TF FPA/
MECHANISMS
GSFC
TIPS/JIM
7/15
Roadmap to PDR for ICDH
´ Key Procurements
• Select Single Board Computer (SBC) Vendor (Selected in early May—will
be BAE, based on performance, not cost.)
• Select Vendor for Spacewire ASIC (Application Specific Integrated Circuit)
´ Documentation
• Develop drafts of:
•
ICDH Box and Card Level Specifications
•
Interface Control Documents
•
Box and Card Level Test Plans and Procedures
• Complete Configuration Control Board (CCB) process for:
•
Verification Plan
•
I&T Plan
´ Key Risk Mitigation Activities
• Progress toward SDRAM verification (256 Mb Hitachi dies, stacked 2x3)
• Progress toward TRL5 for Spacewire
´ Complete ICDH System Concept Review – June 04 (now late July)
06/17/2004
TIPS/JIM
8/15
ICDH SRR Summary Results
´ Very good review. Panel seemed pleased with the
presentation.
´ Concerns about missing/unclear higher-level requirements,
primarily those on total data throughput for Spacewire.
• Kriss developed science use cases that were given to GSFC in support
of answering the RFA on this issue.
´ Philosophy and approach to EMI/EMC testing was discussed
extensively. The panel recognized that systems-level testing
was important in missions with low-noise detectors.
• Note that the EMI/EMC working group being led by John McCloskey at
GSFC is aware of this and is studying all the relevant issues.
06/17/2004
TIPS/JIM
9/15
ISIM Flight Software Reference
Architecture
Activity
Descriptions
Command
Loads
Telemetry
(+Events,
diagnostics)
Visit Files
Flight
Database
Visit Files
ISIM Instrument SW
Covered by this review
Core C&DH
and
ISIM Hardware I/Fs
Command, Telemetry, Memory
Mgt, Stored Command, Tlm
Monitoring, Time Mgt, Health &
Safety, File Mgt, ADP
1553, SpaceWire, FPAP,
BIC, ISIM H/K
Interface
CTP I/F
06/17/2004
SI Application specific software for
NIRCam, NIRSpec, MIRI
Science Exposure Set-up,
Data Read-out, OPE, Acq,
ISIM Housekeeping
ISIM Support
Development
Tools
Operational Interfaces & Loads
Ground System
Command & Tlm
Database
SSR I/F
Simulators
TIPS/JIM
Lab Support
(CM, Maintenance,
etc.)
Operating System
Environment
10/15
ISIM FSW Subsystem
´ Command and Data Handling
•
•
•
•
•
Command Handling
Telemetry collection
Memory Management
Computer Health and Safety
File Management
´ Spacecraft Interface
• Load and dump from/to ground
• Mission Planning Interface (for FGS, Pointing)
• Science Data transfer to the recorder
´ ISIM Support Functions
•
•
•
•
•
06/17/2004
Science Exposure Set-up
SI Detector Read-out
Event Driven Mission Scheduling
SI Target Acquisition
ISIM Housekeeping
TIPS/JIM
11/15
ISIM Software Roles and Responsibilities
´ GSFC ISIM Subsystem
¸ ISIM C&DH Core Flight Software (FSW) and
Shared FSW applications
• Science Instrument Development (SIDU)
Systems for FSW
´ European Space Agency/European Consortium
• NIRSpec Instrument Control Electronics FSW
application
´ Canadian Space Agency
• FGS Flight Software – no direct interface
´ University of Arizona
• NIRCam Instrument (Lockheed Martin ATC is
Prime) ICE and FPE FSW applications
´ GSFC Subsystem Software Support
• NIRSpec FPE FSW application
• Micro-Shutter Array (MSA) FSW application
• Dewar Control Electronics (DCE) FSW
application
Legend
´ JPL
¸Indicates area which is covered by ISIM FSW SRR
• MIRI FPE and ICE FSW applications Status of other FSW Requirements is provided later in
charts
06/17/2004
TIPS/JIM
12/15
ISIM FSW Risks
´ The ISIM FSW is built by geographically diverse
development teams, and there is limited system integration
with flight hardware. There is no one place that the
integrated FSW system (SC–ISIM–SI) is tested against high
fidelity hardware.
´ There is no high fidelity Spacecraft/SRR simulation resident
in the FSW Development/Test Lab.
´ The Common Command & Data Handling (CCDH) shared
resource approach requires a well documented, simple
interface for the SI teams.
´ Mission Operations Requirements have not been flowed
down from the Operational Concept into Mission
Requirements Documents.
06/17/2004
TIPS/JIM
13/15
Roadmap to PDR for ISIM FSW
´ Finalize Requirements and ingest into ReqPro
•
•
•
•
ISIM FSW Requirements
ISIM Core C&DH to FSW Application ICD
Science Instrument Development Unit Specification (SIDU)
Instrument Control Electronics (ICE) Simulator Specification (ICES)
´ Support Development ICDs
•
•
•
•
•
•
Flight to Ground ICD
Flight to Flight ICD
IGSS GSE to ISIM FSW ICD
S/C Simulator to ISIM ICD
ICDH Hardware to IFSW ICD
SI ICDs
´ Key Procurements
• Science Instrument Development Unit (SIDU) Hardware - 06/04
06/17/2004
TIPS/JIM
14/15
ISIM FSW SRR Summary Results
´ Mixed review. Passed, but many unsettled concerns. A follow-up table-top
review will be held later this summer.
´ Many requirements embodied in the Mission Ops Concept Document have
not been properly captured in the Mission-level or ISIM-level requirements.
´ Interfaces were not clearly specified, especially to the ground system.
´ Lots of discussion of the STScI event-driven concept based on the
Observation Plan Executive (OPE) and the associated scripting engine, the
Activity Description Processor (ADP).
• Many panel members expressed reservations about the apparent complexity of
the OPE and ADP.
• Much confusion on the part of the GSFC FSW team as to how this works and
why it is a good idea.
• Presenters, GSFC ISIM team, and reviewers all want a trade study.
•
06/17/2004
This is in work, being lead by Ken Rehm, the JWST Mission Software Lead, at
GSFC.
TIPS/JIM
15/15