FGS Guider
Critical Design Review
Pierre Chayer (HIA/STScI)
March 14th & 15th 2007
COM DEV Ottawa
303 Terry Fox Drive
Kanata, ON, K2K 3J1
FGS Guider CDR – April 19, 2007
© Copyright 2007 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
1
FGS-Guider CDR
• The Critical Design Review (CDR) is a presentation of the detailed
instrument system design.
• CDR allows for the final FGS requirements, resource allocations,
verification plans, and detailed designs to be presented, discussed,
modified (if necessary) and approved.
• CDR discloses the complete system design in full detail.
• CDR ascertains that technical problems and design anomalies have
been resolved.
• CDR ensures that the design maturity justifies the decision to initiate
Flight Unit fabrication, integration and verification of mission
hardware and software.
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
2
FGS-Guider CDR Agenda (Day 1)
E1
E2
E3
01
02
03
04
05
06
06
GUIDER CDR AGENDA
TOPIC
Arrival
Introduction
FGS Science background
Guider Operations & Constraints
CDR Agenda & Programmatic
Baseline & Assumptions for CDR
Non-compliance statement
PA
PA Presentation
04A
Requirements, Reliability, Parts, M&P, Contamination
04B Guider Radiation Analysis
BREAK
Guider Architecture
Region 2 Electronics
06A Region 2 Electronics - Electrical Design Overview
06D
06E
06F
06G
07
N/A
DAY2
TIME
DAY 3
D. Provencal
J. Hutchings
P. Chayer
M. Lihou
I. Barnard
G. Richardson
P. Woods
7:45
8:00
8:10
8:20
8:40
9:00
9:20
9:35
10
10
20
20
20
15
45
P. Woods
9:35
30
H. Rufenacht / K. Man
N. Rowlands
A. Csizmar/D. Henry
D. Henry
10:05
10:20
10:30
11:30
11:30
15
10
60
8236
45
8237
Csizmar/D. Henry
Henry
Kenyon
Henry
12:15
13:00
13:00
13:15
13:55
45
A.
D.
P.
D.
BREAK
Region 2 Electronics (Cont'd)
Focus Housekeeping Board
SIDECAR Control Electronics Board
Power Control Unit
System Level EMC Analysis
14:40
14:50
14:50
15:35
16:20
16:50
10
A. Csizmar/D. Henry
D. Henry
E. Hartwig
J. Metcalf
K. Man
45
45
30
30
8240
8241
8242
8243
BREAK
Assembly, Integration & Test Status
CDR Board Meeting
G. Reis
D. Provencal
17:20
17:30
18:15
10
45
15
8244
LUNCH
Region 2 Electronics Cont'd
06A Region 2 Electronics - Electrical Design Overview (Cont.)
06B Structural & Thermal Analysis
06C SpaceWire Board
06
DAY 1
PRESENTER
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
15
40
45
8228
8229
8230
8231
8232
8233
8234
8239
3
FGS-Guider CDR Agenda (Day 2)
08
08A
08B
08C
08D
08E
08
08F
08G
08H
08
08K
08J
08L
08M
08N
E4
09
9A
9B
10
11
12
13
14
N/A
Guider Optical Assembly
Overview / OA Layout
Optical Design and Analysis
Stray Light Control Design & Analysis
Structural Analysis
Thermal Analysis
BREAK
Guider Optical Assembly (Cont'd)
STOP Analysis
Optical Bench Assembly
Relay TMA (Design & Analysis)
LUNCH
Guider Optical Assembly (Cont'd)
Fine Focus Mechanism
Guider Detector Assembly
FPA and SIDECAR Status
Guider Calibration Source
FGS Alignment (AIT)
Unit Level Cryogenic Facilities at DFL
BREAK
Guider Performance (NEA)
Guider Performance (NEA)
Guider Performance (ID/ACQ)
Margin Summary
Verification
Software Status
Harness Design Status
TFI Design Status
CDR Board Meeting
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
A.
A.
C.
E.
A.
D.
McColgan
McColgan
Evans
Greenberg
McColgan
Aldridge
A.
A.
P.
D.
McColgan
McColgan
Cameron
Aldridge
A. McColgan
L. Richards
D. Aldridge
D. Gulbransen
N. Rowlands
C. Evans
R. Leblanc
N. Rowlands
N. Rowlands
H. Rufenacht
G. Richardson
H. Rufenacht
J. Zhou
W. Lunscher
N. Rowlands
D. Provencal
8:00
8:00
8:25
8:50
9:05
10:05
10:25
10:35
10:35
11:05
11:25
11:45
13:00
13:00
13:45
14:00
14:20
14:35
14:50
15:05
15:15
15:15
16:05
16:45
17:05
17:20
17:30
17:40
17:50
n/a
25
25
15
60
20
10
8246
8247
8248
8249
8250
30
20
20
8251
8252
8253
n/a
45
15
20
15
15
15
10
8255
8254
8256
8257
8258
8245
50
40
20
15
10
10
10
TBD
8259
8260
8261
8262
8263
8264
8265
4
FGS-Guider Operations
ID Cmd
TFI
ID
Config H/W
Config H/W
Obtain Full Image
Process Image
Pattern Recognition
Obtain Images
ACQ Cmd
ACQ
Obtain
Window Image
Config H/W
Idle Clocking
Activity
Descriptor
Scripts
128x128, 32x32
Win Size &
Location
Centroid
Track
Track Cmd
Config H/W
(ISIM FSW)
Obtain
16 x 16 Image
Win Location
Note: FGS FSW telemetry monitoring
of FGS hardware at all times
Centroid
To CTP
(telemetry)
Fine Guide Cmd
Key
FGS -Guider
Function
FGS -TFI
Function
FGS FSW
FGS H/W
Standby
Cmd
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
Obtain
8x8 Image
Fine Guide
Centroid
Standby
FGS Guider CDR – April 19th, 2007
Update H/W
To CTP
5
Identification: Guide Star Recognition
2048 pixels (2.3 ')
FGS FOV
2048 pixels
(2.3 ')
guide star
full frame readout, pattern match of observed stars to
uplinked reference stars to identify guide star.
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
6
FGS-Guider Optical Layout
Pick-off mirror
Focus
mirror
TMA
Detector
2m
100 mm
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
7
FGS Optical Assembly - Guider Side
Guider POM
Guider Relay TMA
Guider
ICP-1
Optical
Alignment
Cube (1 of 2)
Fine Focus
Mechanism
with fold
mirror
Guider
SIDECar
ASICs (2)
Detector
Assembly
With 2 FPAs
Kinematic Mounts
(2 of 3)
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
8
FGS Optical Assembly - With Baffles
Guider Plan View
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
9
FGS in the ISIM Structural Context
MIRI
NIRCam
FGS-TFI
FGS-Guider
NIRSpec
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
10
Main Bench Design Features
2 mm thick ribs,
90mm deep
4 mm thick sidewalls,
110mm deep
Higher density rib
pattern
Hardpoints added
for MGSE
Thermal strap wall
6mm thick
KM mounting pad
thickness increased
to 21mm
Guider POM
deck raised
Structure added to bolster
KM2 – KM3 span
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
11
Thermal Analysis: Cold Steady State
Cold Case:
Requirement Tested:
•Detector absolute temperature below 41 K
Boundary Conditions:
•ISIM Conductive temperature = 30.0 K
•Radiative Environment = 32K, ε =0.01
•Heat strap interface temperature = 30.0 K
•Steady State Heat Loads
Results
•Maximum detector temperatures (30.440 K) are well below the requirement.
•Gradient in the optical bench is 0. 225 K
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
12
FGS Identification Timing Budget
•
•
•
•
Identification duration is dominated by the readout time for the double read
• Double read = reset-read-reset-read, allows Cosmic Ray hits to be filtered out.
As per agreement post-ISIM PDR, FGS allocation of 45 sec applies to readout time only
FGS & ISIM collaborate on overall timing estimate for ISIM allocation of 60 seconds
ID duration estimate is compliant at the ISIM level (< 60 secs per ID attempt, ISIM-266)
Contributor
FGS FSW Command
Item
Duration
(seconds)
Total Duration
(seconds)
SP / ICDH
ID & SCE Setup
Commands
3.648
3.648
Includes first start exposure command
FGS
Strip Readout Duration
1.357
46.33
Double Read: 34 strips (4 pixel overlap assumed)
FGS Requirement (SRD154)
FGS/ ICDH
Strip Data Transfer Time
0.95
FGS FSW
Last Strip Image
Processing
0.775
0.775
Only the last strip image processing time adds to
the total
FGS FSW
Identification Algorithm
7.198
7.198
Algorithm assumes 50 bright objects & 30 triads
SP / ICDH
FGS & ICDH Clean up
commands
0.512
0.512
Total
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
Note
Does not contribute – shorter than readout
58.46
Requirement at ISIM level is < 60 seconds
13
Non-Compliance Statement
•
SRD154
• Requirement text - The total time for an identification image to be
collected, plus execution of the identification algorithm shall be 45
seconds or less (per attempt)
• Traced from – IPFR requirement FGS237
• Status – The estimated duration is 46.33 s
• Discussion – Excess duration is due to need for double detector read to
mitigate SEU. See Section 09B of this package for further details. It has
been agreed that the requirement should be against the readout time
only
• Proposed resolution – Raise Class 1 ECN to remove algorithm
execution time from requirement. Discuss with CSA and NASA and
come to a consensus on path forward on residual non-compliance.
Likely acceptable as is
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
14
Pack and Ship
June 2009
FGS Guider CDR – April 19th, 2007
© Copyright 2006 Her Majesty the Queen in Right of Canada
Subject to Controlled Goods Regulations of Canada
15