SMR-3029
Draft
March 30, 2001
APPENDIX A
REQUIREMENTS TRACEABILITY MATRIX
SMOV3b Level III Requirements
SMR 3029 App. A
ITEM
============
WFPC2
COSTAR
ACS
NICMOS
REQUIREMENTS SEC.
================
J.10.4.1
J.10.4.2
J.10.4.3,
J.10.4.4 (except J.10.4.4.5)
NCS
J.10.4.4.5
STIS
J.10.4.5
ERO
J.10.4.6
OTA/FGS
J.10.4.7
PCS
J.10.4.8
DMS
J.10.4.9
I&C
J.10.4.10
SIC&DH
J.10.4.11
S&M
J.10.4.12
TCS
J.10.4.13
A-1
SMR-3029
Draft
March 30, 2001
EPS
J.10.4.14
APPENDIX A
Appendix A contain tables that trace the Level III
verification requirements to activities identified in this
plan.
These requirements are found in Appendix J, Section
10.4 of the Mission Operations Functional Requirements
Document (SMO-1000C) and are controlled by the HST Operations
and Ground Systems Project, Code 441.
The following tables provide a list of the verification
requirements (following HST release from the Orbiter), that
correlates requirements to activity summaries.
table are:
A-2
Shown in each
SMR-3029
Draft
March 30, 2001
•
Requirement Identification Number
•
Requirement Description
•
Activity Name and Identification Number
•
Execution Time (by execution phase and week)
Table A-1
Verification Requirements Table
Req. ID
Number
SMOV Requirement Description
J.10.4.1
WFPC II Verification
Requirements
J.10.4.1.1
Engineering Activation and
Check-Out Requirements
J.10.4.1.1.1
After release, the instrument
shall undergo an active
decontamination procedure
(Protect Decon) of at least
12 hours. In the interval
between release and the start
of the decontamination
procedure, the shutter shall
remain closed and the Thermal
Electric Coolers (TECs) shall
remain off.
WFPC2-01
SMS
J.10.4.1.1.2
Upon completion of the
decontamination procedure,
the instrument shall undergo
a contamination verification
phase of at least 48 hours
which shall be monitored by
the STScI. Upon the approval
of STScI, the instrument
shall be cooled to its
WFPC2-03
SMS
A-3
Activity
Executio
Name and
n Time
Identifica
-tion
Number
SMR-3029
Draft
March 30, 2001
nominal operating temperature
and the AFMs shall be reset.
A-4
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
Activity
Name and
Identifica
-tion
Number
WFPC2-03
Executio
n
Time
J.10.4.1.1.3
Following TEC turn on, a
standard UV stellar monitor
shall be scheduled at least
trice during the first week
&, starting with the second
week, at a declining
frequency for the duration of
SMOV. A decontamination
procedure shall be executed
no later than 1 week after
TEC turn-on, and at declining
frequency thereafter. (The
STScI will use the UV monitor
to determine whether the
planned decontamination cycle
is executed or additional
decontaminations are
necessary.)
J.10.4.1.2
Science Verification
Requirements
J.10.4.1.2.1
An initial set of PSF
measurements shall be
performed.
WFPC2-07
SMS
J.10.4.1.2.2
A photometric calibration
shall be performed.
WFPC2-04/
06
SMS
J.10.4.1.2.3
Internal calibrations,
including dark frames, bias
frames, K-spot images, and
internal flat fields, shall
be performed.
WFPC2-05/
08
SMS
A-5
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.1.2.4
If the operational state of
the NCS changes with respect
to the first PSF measurement
(J.10.4.1.2.1), a second PSF
measurement shall be
performed to reflect normal
HST operations.
J.10.4.1.2.5
During the first 30 days
after TEC turn-on, no
external WFPC2 pure parallels
shall be scheduled, except as
required to test its parallel
capabilities as provided in
J.10.4.16.3
J.10.4.2
COSTAR Verification
Requirements
Activity
Name and
Identifica
-tion
Number
WFPC2-07
Executio
n
Time
N/A
NORMALOPS
N/A
NORMALOPS
SMS
No applicable requirements
J.10.4.3
ACS Verification Requirements
j.10.4.3.1
Engineering Requirements
J.10.4.3.1.1
ACS entry into each of four
instrument states (Boot,
Hold, Operate, Observe) shall
be demonstrated. Operations
shall be commanded via stored
commands transmitted over the
Supervisory Bus.
A-6
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.1.2
ACS entry into each of the
defined detector states shall
be demonstrated. Operations
shall be commanded via stored
commands transmitted over the
Supervisory Bus.
J.10.4.3.1.3
ACS command and engineering
data interface via the RIU
and science data transmission
via the Science Data
Formatter (SDF) shall be
verified by monitoring of
normal configuration and
science activities.
N/A
NORMALOPS
J.10.4.3.1.4
The ability to load and dump
on-board memory shall be
demonstrated.
ACS-02
R/T
J.10.4.3.1.5
The ability to read and write
data from and to the science
data buffer shall be
demonstrated.
ACS-03
R/T
A-7
Activity
Executio
Name and
n Time
Identifica
-tion
Number
N/A
NORMALOPS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.1.6
The performance of the cal/
Coronagraph Door, M3 Fold
Mechanism, Im1 and M1
Alignment and Focus Corrector
Mechanisms, WFC/HFC Filter
Wheels 1 and 2, SBC Filter
Wheel, and WFC and HRC CCD
shutters shall be verified.
The functionality of the ACS
Tungsten calibration Lamps
and Pre-Flash LEDs shall be
verified. Operation of the
deuterium lamp shall be
deferred for an initial
outgassing period following
release of the observatory,
as defined in the CARD.
J.10.4.3.1.7
J.10.4.3.1.8
Functionality of all three
ACS detectors shall be
demonstrated through normal
SMOV operations. This shall
include the proper
accumulation of signal over a
specified time internal and
data readout (including
compressed data), as well as,
for the CCDs, readout of a
single subarray and
commandability of gain
settings.
A-8
Activity
Name and
Identifica
-tion
Number
ACS 16/21
Executio
n
Time
ACS-05/32
SMS
ACS-05
ACS-08
SMS
R/T
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.1.9
The ability of the TECs to
cool and stably control the
CCDs shall be tested at a
small number of temperature
set points, in order to
determine the coldest stable
operating point, which is the
final setting desired. The
requirement is that this
point be at least as cold as
–80C.
J.10.4.3.1.10
ACS operations shall be
managed to minimize risk of
contamination of its optical
surfaces by materials
outgassed either internally
or from other units installed
during the SM as well as from
the payload bay environment
during servicing. The ACS Cal
Door shall be used to provide
ACS contamination protection
while the OTA is viewing the
bright earth for the duration
of the SMOV program. A
contamination monitoring
program shall be initiated as
early as possible after the
SM.
A-9
Activity
Executio
Name and
n Time
Identifica
-tion
Number
ACS-06
SMS
ACS-10
SMS
SMR-3029
Draft
March 30, 2001
J.10.4.3.1.11
High voltage operation of the
ACS SBC MAMA detector shall
be delayed for an initial
outgassing period following
release of the observatory,
as defined in the CARD.
ACS-10
SMS
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.2
Target Acquisition
Requirements
J.10.4.3.2.1
The location of a reference
ACS HRC camera aperture shall
be determined with respect to
the FGS reference frames to
an accuracy of +/- 1
arcsecond in V2-V3
coordinates and 10 arc
minutes in aperture rotation
angle.
ACS-11
SMS
J.10.4.3.2.2
The relative positions of the
ACS coronagraphic field masks
and Fastie finger, determined
during ground test, shall be
confirmed.
ACS-12
SMS
J.10.4.3.2.3
The ability of the FSW to
perform isolated point source
acquisition onto the
coronagraphic spots shall be
demonstrated with the ACS HRC
detector. Successful
execution of these
acquisitions will also
ACS-12
SMS
A-10
Activity
Executio
Name and
n
Identifica Time
-tion
Number
SMR-3029
Draft
March 30, 2001
demonstrate the ability of
the FSW to calculate the
centroid of target positions
and to perform automated
telescope pointing.
J.10.4.3.3
Optical Alignment
Requirements
A-11
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.3.1
The encircled energy and
image diameter shall be
measured over a grid of focus
and tilt positions for both
IM1 and M1 correctors. These
measurements shall be used to
se the nominal corrector
positions.
The camera mode image quality
at the detectors over the
full field shall be measured
via broad and narrow band
imaging of stars. The
requirement for encircled
energy in the WFC and HRC is
75% within a diameter of .25
arcseconds, through the F502N
filter. The requirement for
encircled energy in the SBC
is 30% within a diameter of
0.10 arcseconds, for a star
observed through the Lyman
alpha filter.
J.10.4.3.3.2
J.10.4.3.3.3
The internal stability of ACS
from coronagraphic field stop
to HRC detector shall be
monitored. The image shifts
seen shall be compared to the
specified stability of 0.12
HRC pixels RMS over 1300 s
and +/- 0.20 HRC pixels over
a three hour period.
A-12
Activity
Name and
Identifica
-tion
Number
ACS-13/14
Executio
n
Time
ACS-15/23
SMS
ACS-16
SMS
SMS-R/T
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4 3.3.4
The pointing and throughput
stability of the OTA-ACS
combination shall be measured
over several orbits. The
purpose of these measurements
is twofold: 1. Confirm that
the typical
Thermal environment after
SM3B does not cause
unacceptable image drifts.
2. Determine ACS image
quality and pointing
stability before and after
the start of NCS operation.
J.10.4.3.3.5
The ACS Point Spread Function
(PSF) in normal imaging and
coronagraphic modes shall be
measured.
J.10.4.3.4
Calibration Requirements
J.10.4.3.4.1
The plate scale, orientation
and geometric distortion
shall be measured for each of
the ACS channels by imaging
an astrometric field.
Relative location of each
aperture in the FGS frame
shall also be determined with
these measurements.
A-13
Activity
Executio
Name and
n Time
Identifica
-tion
Number
ACS-17
SMS
ACS-23/25
SMS
ACS-27
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.4.2
Dark rate and read noise and
CTE for each CCD detector
shall be measured, as well as
dark rate for the SBC MAMA
detector. The hot pixel
creation rate shall be
assessed and the efficacy of
the hot annealing cycle shall
be demonstrated.
J.10.4.3.4.3
Instrument sensitivity vs.
wavelength shall be measured
for a subset of ACS modes.
Sensitivity measurements
shall be performed using
astronomical standard stars.
As part of this process, UV
sensitivity measurements
shall be obtained as early as
possible, to enable early
trending of UV sensitivity.
J.10.4.3.4.4
The instrumental polarization
as function of wavelength
shall be measured for both
WFC and HRC channels.
A-14
Activity
Executio
Name and
n Time
Identifica
-tion
Number
ACS-05/22
SMS
ACS-31
ACS-20/26
ACS-29
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.3.4.5
The flat field uniformity per
pixel & cosmetic defect
fraction shall be measured
for each of the 3 ACS
detectors. The ability to
determine the residual
response variation using the
ACS internal calibration
sources shall be
demonstrated. The difference
between sky flats and
internal flats and temporal
stability of the flat field
correction shall be assessed.
NICMOS Verification
Requirements
J.10.4.4
J.10.4.4.1
Engineering Activation
Requirements
J.10.4.4.1.1
The ability to command NICMOS
via the RIU, science data
transmission via the SDF, and
the ability of NICMOS to
A-15
Activity
Executio
Name and
n Time
Identifica
-tion
Number
ACS-18
SMS
NICMOS-03
SMS
SMR-3029
Draft
March 30, 2001
transition between its
primary operational states
(Hold, Boot, SAA-Oper,
Operate, and Observe) shall
be verified.
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.4.1.2
Operation of the NICMOS
mechanisms (PAM, FOM, and
filter wheels) shall be
tested. PAM motion over the
range needed to assure focus
in all three NICMOS cameras
(best achievable focus for
NIC3) and +/- 10 steps in X
tilt and +/- 12 steps in Y
tilt shall be demonstrated.
The ability to reposition the
field off-set mirror (FOM)
over the range needed to
remove vignetting in NIC3
shall be demonstrated.
Internal lamp exposures shall
be obtained at each filter
wheel position.
J.10.4.4.2
Target Acquisition
Requirements
A-16
Activity
Name and
Identifica
-tion
Number
NICMOS-01/
02/14
Executio
n
Time
SMS
SMR-3029
Draft
March 30, 2001
J.10.4.4.2.1
J.10.4.4.2.2
The location of each NICMOS
camera aperture shall be
determined with respect to
the FGS reference frames to
an accuracy of +/- 2
arcseconds in V2-V3
coordinates and 7 arc minutes
in aperture rotation angle
for Camera 2 and 1 degree for
cameras 1 and 3.
The performance of the
coronograph shall be
demonstrated by an
observation of an isolated
point source following an
onboard acquisition (Mode 2
acq) with an autonomous
location of the coronographic
hole.
NICMOS-10
SMS
NICMOS-12/ SMS
13
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.4.3
Optical Requirements
J.10.4.4.3.1
The optical plate scales at
each of the detector focal
planes shall be measured, to
a with a precision of 1/5
pixel in each camera.
NICMOS-11
J.10.4.4.3.2
Optical alignment shall be
restored to the level of
performance achieved during
Cycle7. PAM focus setting
should be measured and
trended to establish and
maintain focus within +/- 1
mm of nominal (best) focus
for each camera. The
NICMOS-06/ SMS
07/09
A-17
Activity
Executio
Name and
n Time
Identifica
-tion
Number
SMS
SMR-3029
Draft
March 30, 2001
encircled energy within a 100
mas (200 mas for Camera 3)
radius of an unresolved
pointsource shall be
measured. The goal is to reestablish the performance
achieved in Cycle 7 when the
total wavefront error was
λ/14 or better in all cameras
except for NIC3 in the J band
where it was λ/10.
J.10.4.4.3.3
Root mean square image motion
shall be characterized.
J.10.4.4.4
Calibration Requirements
A-18
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.4.4.1
The ability to determine
residual pixel-to pixel
variation using the internal
flat-field calibration source
shall be demonstrated. The
stability of the instrumental
flat-fields will be
characterized over timescales
of orbits, days, and one
month.
J.10.4.4.4.2
The ability to calibrate
spectral throughput shall be
demonstrated. The goal is the
calibration of the absolute
flux level to an accuracy of
approximately 10%. Total
instrument throughput shall
be determined and compared to
that measured previously
during Cycle 7.
NICMOS-05/ SMS
15
J.10.4.4.4.3
The ability to do
differential photometry with
a residual measurement error
no greater than 3%, and a
temporal stability of 3% over
a month shall be
demonstrated. The
consequences of detector
temperature stability will be
assessed.
NICMOS-15
A-19
Activity
Executio
Name and
n Time
Identifica
-tion
Number
NICMOS-14
SMS
SMS
SMR-3029
Draft
March 30, 2001
A-20
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.4.4.4
NICMOS geometric stability
will be characterized as a
function of orbital elements,
vehicle orientation, and
dewar temperatures by
measuring the lateral motion
of the image in the Camera 2
focal plane.
J.10.4.4.4.5
Detector read noise and dark
current shall be measured.
The minimum acceptable levels
of performance are a read
noise of </=40 electrons and
a dark current of </=2.5
electrons/second.
J.10.4.4.4.6
The cosmic ray background
will be measured and
confirmed to be comparable to
the Cycle 7 levels.
J.10.4.4.4.7
HST + NICMOS thermal emission
will be characterized in a
subset of spectral elements
over the duration of SMOV.
A-21
Activity
Executio
Name and
n Time
Identifica
-tion
Number
NICMOS-04
SMS
NICMOS-18
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.4.4.8
The decay timescale for image
persistence will be
determined for both images
from external sources of
light and from cosmic rays.
J.10.4.4.4.9
The photometric and
wavelength solutions for the
G096 and G141 grisms will be
remeasured.
J.10.4.4.4.10
During the initial cooldown
phase, NICMOS detector dark
current and flat-field
performance in all three
cameras shall be measured in
3-degree steps starting at
100 degrees K.
J.10.4.4.5
NICMOS Cooling System (NCS)
Engineering Verification
Requirements
J.10.4.4.5.1
Configure the NCS to re-cool
NICMOS detectors. The goal
during SMOV is to verify the
capability to maintain the
NICMOS Cooling Coil
temperature less than or
equal to 69 +/- 0.1K.
NCS-01
R/T
J.10.4.4.5.2
Verify the capability of the
NCS to achieve a NICMOS Cold
Well temperature of 75 +/- 3
degrees Kelvin and maintain
it within 0.1K.
NCS-01
R/T
A-22
Activity
Name and
Identifica
-tion
Number
NICMOS-16/
17
Executio
n
Time
SMS
NICMOS-19/ SMS
20
SMR-3029
Draft
March 30, 2001
A-23
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
Activity
Name and
Identifica
-tion
Number
NCS-01
Executio
n
Time
J.10.4.4.5.3
Verify the NCS capability to
provide adequate level of
thermal stability and
repeatability for NICMOS
science operations. Minimum
acceptable levels of
performance are thermal
stability at the detector
baseplate of +/- 0.1K over
one hour and +/- 0.5K over
one month.
J.10.4.4.6
NICMOS/NCS Calibration and
Performance Requirements
J.10.4.4.6.1
The temperatures of each
NICMOS detector, along with
its range of variation and
the timescales for variation,
shall be determined. Detector
temperature stability shall
be characterized over periods
of 60 sec, 2000 sec, 24
hours, and 30 days.
NCS-01
SMS
J.10.4.4.6.2
The temperature of the VCS
(and hence the filter
elements), along with its
range of variation and the
timescales for variation,
shall be determined. The
thermal stability of the VCS
shall be determined to be
within +/- 5K of the nominal
operating temperature as
determined by models of NCS
NCS-01
SMS
A-24
R/T
SMR-3029
Draft
March 30, 2001
performance.
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.5
STIS Verification
Requirements
J.10.4.5.1
Engineering Requirements
J.10.4.5.1.1
Minifunctional tests shall be
executed for all three STIS
detectors. The high voltage
for the STIS MAMA detectors
will not be activated until
at least four days after
release, as in SM3A.
STIS-01
SMS
J.10.4.5.1.2
The ability of the TEC to
cool and stably control the
CCD at the nominal CCD
operating temperature of –83
degrees C shall be tested
during the course of normal
operations, including
simultaneous operation of
other instruments.
STIS-01
SMS
J.10.4.5.1.3
Contamination Plan:
1. The STIS Deuterium and
Krypton lamps will not be
operated until 3 weeks
after release as in SM3A.
2. STIS sensitivity will be
monitored periodically.
STIS-00/05 SMS
STIS-06
J.10.4.5.2
Target Acquisition
Requirements
A-25
Activity
Executio
Name and
n Time
Identifica
-tion
Number
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.5.2.1
The location of a reference
STIS camera aperture shall be
determined with respect to
the FGS reference frames to
an accuracy of 1 arcsecond in
V2-V3 coordinates and 10 arc
minutes in aperture rotation
angle.
J.10.4.5.3
Optical Alignment
Requirements
The slit plane encircled
energy vs. wavelength and
image diameter shall be
measured for the nominal
corrector focus and tilt
positions. A standard
aperture throughput test
shall be used to assess STIS
focus. If throughput is down
by more than 3 sigma (7%),
relative to the pre-SM3B
mean, further tests and
perhaps a STIS corrector
alignment shall be done.
J.10.4.5.3.1
A-26
Activity
Executio
Name and
n Time
Identifica
-tion
Number
STIS-02/04 SMS
STIS-05
STIS-02/20 SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
J.10.4.5.3.2
For each supported
combination of optical
element and detector, the
location on the spectrum or
slit image on the detector
shall be compared to pre-SM3B
values. Operationally
significant shifts shall be
corrected by updating onboard mechanism calibration
tables. Updates shall be
verified by retesting the
affected optical element and
detector combination(s). Only
one orientation of each
optical element need be
tested.
J.10.4.5.3.3
The slit-to- detector
internal stability of STIS
shall be monitored. The
spectral shifts seen shall be
compared to the specified
stability of 0.2 low
resolution MAMA pixels over a
one hour period. The purpose
of this measurement is
twofold:
1. Measure spectral shifts in
the typical post-SM3B
thermal environment to
check if the maximum time
between wavelength
calibration exposures need
to be reduced.
A-27
Activity
Executio
Name and
n
Identifica Time
-tion
Number
N/A
STIS-04
SMS
SMR-3029
Draft
March 30, 2001
2. Measure STIS spectral
image quality with and
without NCS operating.
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.5.3.4
The pointing and throughput
stability of the OTA-STIS
combination shall be
measured over several
orbits. The purpose of this
measurement is twofold:
1. Measure image drifts in
the typical post-SM3B
thermal environment.
2. Measure STIS image quality
with and without NCS
operating.
J.10.4.5.4
Calibration Requirements
J.10.4.5.4.1
Dark rate and read noise for
each detector shall be
measured at the nominal
operating temperatures, and
will be periodically
monitored to track
variations with time and
temperature. The goals are:
1. Measure the noise
properties of STIS
detectors with and without
NCS operating.
2. To calibrate NUVMAMA dark
rate vs. temperature and
time since SAA passage in
A-28
Activity
Executio
Name and
n Time
Identifica
-tion
Number
STIS-02/04 SMS
STIS-01/07 SMS
STIS-08/09
SMR-3029
Draft
March 30, 2001
the post-SM3B operating
environment.
A-29
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.5.4.2
Instrument sensitivity shall
be measured for the lowresolution spectroscopic
modes for contamination
monitoring. Sensitivity
measurements shall be
performed using astronomical
standard stars. Sensitivity
shall be measured at
different values of the MAMA
temperatures.
J.10.4.6
Early Release Observation
J.10.4.6.1
SMOV activities shall
include early release
observations with at least
ACS and NICMOS science
instruments. The resulting
science data products shall
be released into the public
domain to demonstrate the
improved HST capabilities.
J.10.4.7
Optical Telescope
Assembly/Fine Guidance
Sensor Verification
Requirements
J.10.4.7.1
Optical Interfaces
J.10.4.7.1.1
HST‘s secondary mirror shall
only be moved to compensate
for desorption in the
graphite epoxy structure.
A-30
Activity
Executio
Name and
n Time
Identifica
-tion
Number
STIS-06
SMS
ERO-01
SMS
SMR-3029
Draft
March 30, 2001
J.10.4.7.1.2
A check of the OTA focus
shall be made.
J.10.4.7.2
FGS Calibration
FGS/OTA-06 SMS
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.7.2.1
The distortions, plate
scale, alignment, and Scurve morphology and
amplitude in all three FGSs
shall be measured after the
completion of SM3B. These
data are to be compared to
pre-SM3B observations to
verify the validity of the
operational calibration
database for each FGS.
If necessary, as indicated
by the results of
J.10.4.7.3.1, the optical
field angle distortion
(OFAD) will be re-calibrated
for a given FGS. The
appropriate onboard flight
software tables and PDB
shall be updated as
necessary.
J.10.4.7.2.2
J.10.4.7.2.3
If necessary, as indicated
by the results of
J.10.4.7.2.1, the FGS-to-FGS
alignment calibration shall
be performed and the
appropriate alignment
matrices will be computed.
Onboard tables and the PDB
shall be updates with the
new calibration parameters.
A-31
Activity
Executio
Name and
n Time
Identifica
-tion
Number
FGS/OTA-02 SMS
FGS/OTA-03 SMS
FGS/OTA-04 SMS
SMR-3029
Draft
March 30, 2001
A-32
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.7.2.4
If necessary, as indicated
by the results of
J.10.4.7.2.1, S-curves in a
given FGS will be obtained
at 5 locations in the FOV.
These data will be used to
update the FGS commanding
database so that appropriate
K-factor values used for the
acquisition and tracking of
guide stars can be computed.
J.10.4.7.2.5
The FGSs will be used to
measure the jitter
experienced by HST during
the operation of NCS.
J.10.4.7.3
FGS Astrometry Science ReCommissioning
J.10.4.7.3.1
The photometric response,
distortions, plate scale,
and S-curve morphology and
amplitude will be measured
in the Astrometer FGS. These
data will be used to
recertify the Astrometer for
scientific observations.
J.10.4.8
Pointing Control Subsystem
Verification Requirements
A-33
Activity
Executio
Name and
n Time
Identifica
-tion
Number
FGS/OTA-05 SMS
FGS/OTA-06 SMS
FGS/OTA-07 SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.8.1
The initial attitude shall
be determined to an accuracy
within .2 degrees using
Fixed Head Star Tracker
(FHST) data.
J.10.4.8.2
The gyro drift rate bias
shall be calibrated to
within 0.05 arcseconds per
second prior to the first
guide star acquisition.
PCS-01/02
R/T
J.10.4.8.3
The FHST/FHST alignment
matrices shall be computed,
using FHST observations at
the initial attitude, to an
accuracy of 5 arcseconds
(1σ). The FHST/FHST
alignment matrices shall be
updated if the change in the
pitch or yaw alignment
exceeds 20 arcseconds. The
alignment computations will
be further refined during
normal operations to achieve
accuracy comparable to the
pre-Servicing Mission level.
PCS-04
R/T
J.10.4.8.4
The gyro-to-FHST alignment
matrices shall be maintained
to an accuracy that reduces
the attitude error following
a vehicle maneuver to less
than one arcsecond per
degree of slew. If any gyros
are changed out, a full RGA
calibration will be
PCS-05/06
R/T-SMS
A-34
Activity
Executio
Name and
n Time
Identifica
-tion
Number
PCS-01/03
R/T
SMR-3029
Draft
March 30, 2001
performed.
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.8.5
The PCS shall acquire guide
stars in fine lock.
J.10.4.8.6
The vehicle jitter during
periods of fine lock shall
be measured.
A-35
Activity
Executio
Name and
n Time
Identifica
-tion
Number
PCS-07
SMS
PCS-07
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID
Number
SMOV Requirement Description
A-36
Activity
Executio
Name and
n Time
Identifica
-tion
Number
SMR-3029
Draft
March 30, 2001
J.10.4.8.7
Perform a Vehicle Disturbance
Test (VDT) to characterize
the disturbance environment
of the HST using a lowbandwidth attitude control
law during gyro-hold with the
gyros in low-mode. The VDT is
a passive test (not a forcedresponse test). Obtain
signatures for both
externally induced (e.g. SA3) and internally induced
(e.g. NCC) disturbances for
comparison with past VDT
results and characterize
jitter induced by the SA-3,
NCS, and the ACS Filter
Wheel. The VDT shall consist
of five separate tests that
need not occur consecutively.
The overall duration of the
VDT tests are at least 17
orbits of spacecraft time
including (1) at least 1 full
orbit at +V3 sunpoint prior
to NCC operation while
performing ACS Filter Wheel
moves simulating routine
flight operations, (2) at
least 5 full orbits at +V3
sunpoint prior to NCC
operation, (3) at least 1
full orbit at +V3 sunpoint
during NCC startup, (4) at
least 5 full orbits at +V3
sunpoint while NCC is
operating at steady-state,
and (5) at least 5 full
orbits at –V1 sunpoint with
the NCC operating at steadystate.
PCS-08
SMS
Table A-1
Verification Requirements Table (Continued)
A-37
SMR-3029
Draft
March 30, 2001
Req. ID Number
SMOV Requirement Description
J.10.4.8.8
Contingent upon analysis of
PCS performance post-SM3B,
perform a Transfer Function
Test (TFT). The TFT is a
forced response test that
measures HST system modal
parameters (modal gains,
modal damping ratios and
frequencies) by applying a
RWA forcing function and
measuring RGA gyro response.
This test will be performed
if PCS analysis of post-SM3B
HST flight data (such as the
VDT) suggests that HST
system modal parameters
significantly differ from
pre-SM3B analytical models.
On-orbit modal parameters
that differ from pre-SM3B
models can cause degraded
performance of the HST
attitude control system
because of reductions in
stability margins and/or
increased vehicle jitter.
J.10.4.9
Data Management Subsystem
Verification Requirements
No applicable requirements.
J.10.4.10
Instrumentation &
Communications Subsystem
Verification Requirements
No applicable requirements
J.10.4.11
SI C&DH Verification
Requirements
A-38
Activity
Executio
Name and
n Time
Identifica
-tion
Number
PCS-09
SMS
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
Activity
Executio
Name and
n Time
Identifica
-tion
Number
No applicable requirements
J.10.4.12
Structures and Mechanisms
Subsystem Verification
Requirements
No applicable requirements
J.10.4.13
Thermal Control Subsystem
Verification Requirements
J.10.4.13.1
Verify the predicted
temperature changes due to
the NOBL installation on SSM
bays 5, 6, 7 and 8.
J.10.4.14
Electrical Power Subsystem
Verification Requirements
Solar Array III (SAIII)
Verification Requirements
J.10.4.14.1
A-39
TCS-01
SMS
SMR-3029
Draft
March 30, 2001
J.10.4.14.1.1
SAIII drive system
performance shall be
characterized during the SMOV
period and the following
requirements verified. 1. The
sensed position is within +/3.5 degrees of the commanded
position when operating
within the range 0 to 130
degrees, and +/- 5.0 degrees
outside this range, 2. The
maximum command profile error
shall be less than the
safemode test threshold (10
degrees for 3 seconds).
A-40
EPS-01
Analysis
Task
SMR-3029
Draft
March 30, 2001
Table A-1
Verification Requirements Table (Continued)
Req. ID Number
SMOV Requirement Description
J.10.4.14.1.2
SAIII power generation
performance shall be assessed
and compared to Beginning of
Life(BOL) predictions that
account for expected
degradation. To the extent
possible, measurements shall
be recorded when HST is at
orbit noon, when the Sun
vector is within +/- 10
degrees of the –V1 axis, when
the SA/Sun incidence angle is
less than 5 degrees, and when
all the available CCC Krelays and SPA Trim Relays
are closed.
J.10.4.14.2
Power Control Unit
J.10.4.14.2.1
A software charge control
mode, Trim Relay SoftWare
Charge Control with the V/T
Front End (TRSWCC/VTFE),
shall perform charge control
and maintain battery thermal
stability. This shall be
verified for periods of high
suntime, low solar array
incidence angles, and at a
minimum HST load power for
the expected load range
following SM3B.
A-41
Activity
Executio
Name and
n Time
Identifica
-tion
Number
EPS-02
Analysis
Task
EPS-03
Analysis
Task