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UARS WEEKLY STATUS REPORT - 10 NOV 2000
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SOLSTICE
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SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Due to the current yaw offset attitude, the SSPP is late in acquiring
precision solar tracking. Valid SOLSTICE data is being taken while the SSPP
is trying to lock onto the sun and a proper pointing correction will be
applied.
We continue our testing of the OA_SSPP_ATT engineering patch and will begin
level2 (re)processing of the last year's worth of data when this is
complete.
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SUSIM
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Nothing received.
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ACRIM
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Nothing received.
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PEM
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The PEM zenith spectrometers are activate in daylight mode.
At the present time, PEM energy deposition from its spectrometers is not
being generated. Recent data configuration changes have affected PEM software
causing multiple failures. These failures are being reviewed by the PEM team.
In order to correct for new telemetry requirements, PEM will need to update
processing code with a patch delivery. The delivery patch may include changes
which would allow the PEM software to execute on a DEC Alpha machine. GSFC is
helping PEM with some DEC Alpha particulars which have caused PEM level 3
code to fail on DEC Alpha machines (software below level 3 executes on the
DEC Alpha).
The PEM team is working on replacing the PEM:: machine with a DEC Alpha
machine to be called PEM2K::. PEM:: is now over 10 years old and its hardware
is now very difficult and costly to maintain. PEM:: is also showing signs
of slowly failing, and it is doubtful that PEM:: could be repaired if it failed.
The PEM system depends on PEM:: for instrument commanding and telemetry flow,
so it is an integral part of the PEM ground system. Current tests of telemetry
transfers through PEM2K:: have been successful.
Updated HEPS calibration parameters have been finalized and are ready for
delivery. Updated MEPS quality calibration files have been finalized and are
ready for delivery. Level 3 software errors, discovered by Dr. Dean Pesnell,
have been fixed; his suggestions have been incorporated with in the PEM
production code. Both updated HEPS and MEPS calibration data, along with the
Level 3 code changes, will influence the in-situ energy deposition predictions,
so new versions of PEM energy deposition Level 3 files will be generated.
*Beginning of power orbit day (PEM activation): array current >5 amps, array
voltage >53.5 volts, and battery current >2.0 amps.
End of power orbit day (PEM deactivation): time in power orbit day >4 minutes,
array current <9 amps, and battery currents <0.2 amps.
Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta.
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HALOE
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Nothing received.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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Nothing received.
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MPG
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Daily processing of instrument Daily Activity Plans continues
with no problems. Instrument operations schedule is complete
to 3 December 2000. The MPG continues to coordinate with the
Flight Operations Team and to assist the Project Scientist
with the scheduling of instrument operations.
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CDHF
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 28 October 2000 (Orbit 49905, GMT Day 302) through 03
November 2000 (Orbit 50011, GMT Day 308).
SPACECRAFT OPERATION
The observatory is now in Reverse Flight (Northern Hemisphere viewing) and is
performing nominally under two-battery operations. The instrument operational
changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
PEM 304/2346 49951 AXIS POWER OFF
HALOE 308/2211 50009 POWER OFF
The beta angle ranged between the angles of 23.4 degrees to 48.9 degrees for
this report period. The beta angle is now increasing towards a maximum angle
of 75 degrees on 12 November 2000(DOY 317).
Spacecraft battery 1, 2, and 3 performance monitoring continues. Battery 1
remains OFF the charge relay. Battery 2 and Battery 3 are currently
maintaining greater than 23.8 V end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and Battery
3 of 1.3 to 1.9 degrees C. Additional battery performance data for each
battery on 27 October 2000 and 3 November 2000 are provided in Appendix D.
The clock error ranged from Ð12.3 to 11.3 msec during this report period.
Clock rate adjustments are listed in Appendix C.
All instrument and subsystem engineers were advised on the initial excursion of
ALERTS or Out-Of-Limits conditions detected by the FOT for this report. A
summary is listed below and the details of ALERT and Out-Of-Limits occurrences
are listed in Appendix B.
¥ OUT-OF-LIMITS = 00
¥ ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
¥ FOT = 22
¥ HALOE = 01
¥ PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 02
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/221 - 2287.496937
· Transponder B: 00/305 - 2287.499087
GROUND SYSTEM OPERATION
Two (2) operational support problems occurred this period. Anomaly Reports are
included in Appendix E.
The data loss calculations supplied by Data Capture Facility (DCF) from mission
start through UTC Day 00/301 show the observatory data loss to be 298 hours, 45
minutes, 26.464 seconds (an increase of 10.784 seconds since the last report
period). This is a 0.39 percent data loss which equals a 99.61 percent data
capture for the mission.
The increase of 10.784 seconds occurred over three (3) days:
· 0 minutes 10.784 seconds on Day 300 due to a data hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
On 03 November 2000 a +3 degree yaw offset maneuver was performed. This was
done as a preliminary test for the +10 degree yaw offset, which will be
performed over the course of the high beta period next week. The yaw offset is
necessary to bring the sun back into the field of view of the Fine Sun Sensor
(FSS). Data from this maneuver will be analyzed to verify that all power and
thermal constraints are kept before executing the +10 degree yaw offset on 06
November 2000.
Testing continues daily to get the TAM and FSS attitude control solution
operational. The UARS testing and training simulator (UTTS) is being used for
all testing. In order to insure the validity of the test the FOT has been
debugging some problems with the simulator attitude models.
MEETINGS
The FOT attended a meeting to discuss UARS Attitude on 01 November 2000.
The FOT attended the UARS Monthly Status Meeting on 01 November 2000
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for December 02, 2000 (DOY 337). This
maneuver will be a Reverse to Forward Flight maneuver (Northern Hemisphere
viewing).
Attachments: Appendix A, Real-time Commands Sheets
Appendix B, Out-Of-Limits & ALERT Occurrences
Appendix C, Clock & Solar Array Rate Corrections
Appendix D, UARS Battery Performance Data
Appendix E, UARS Anomaly Reports
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 03 November 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
49911 302/0910 00-600 NBTR NOOPS D-302
49917 302/1839 00-602 NBTR NOOPS D-303
49925 303/0643 00-602 NBTR NOOPS D-303
49932 303/1841 00-603 NBTR NOOPS D-304
49939 304/0501 00-603 NBTR NOOPS D-304
49945 304/1512 00-604 OBC GYRO BIAS UPDATE
49947 304/1842 00-605 NBTR NOOPS D-305
49951 304/2346 00-606 PEM AXIS POWER OFF
49954 305/0504 00-605 NBTR NOOPS D-305
49961 305/1702 00-607 OBC GYRO BIAS UPDATE
49962 305/1925 00-608 NBTR NOOPS D-306
49969 306/0506 00-608 NBTR NOOPS D-306
49972 306/1048 00-609 OBC Clk Adj 0.0 to 20.6 msec/day
49977 306/1845 00-610 NBTR NOOPS D-307
49983 307/0359 00-610 NBTR NOOPS D-307
49990 307/1521 00-611 OBC/ACS 3 DEG POSITIVE YAW
49990 307/1521 00-612 OBC/ACS 3 DEG NEGATIVE YAW
49991 307/1601 00-613 OBC GYRO BIAS UPDATE
49994 307/2112 00-614 NBTR NOOPS D-308
49996 308/0030 00-614 NBTR PLAYBACK
49999 308/0510 00-614 NBTR NOOPS D-308
49999 308/0510 00-615 OBC Clk Adj 20.6 to 0.0 msec/day
50007 308/1848 00-616 NBTR NOOPS D-309
50009 308/2211 00-617 HALOE POWER OFF
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 03 November 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
-None this report period
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 03 November 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ------- ---------------------------------
49972 306/1050 Clk Adj from 0.0 to 20.6 msec/day
49999 308/0521 Clk Adj from 20.6 to 0.0 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 03 November 2000
27 Oct 2000 - GMT Day 301 Beta = 19.1 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- --------- ------- ---------- ------ ------- ------
1 +728.0/+728.0 -3.05/-4.94 +0.0/+0.0 14.2 0.000 0.0
2 +56.0/-11.2 +5.79/+3.87 +30.4/-14.4 24.2 1.030 21.5
3 00.0/-123.2 +4.51/+2.92 +29.6/-15.2 24.2 1.020 21.4
3 Nov 2000 - GMT Day 308 Beta = 48.9 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ----------- -------- --------- ------ ------- ------
1 +728.0/+728.0 -3.05/-4.62 +0.0/+0.0 14.2 0.000 0.0
2 +22.4/-22.4 +5.15/+3.87 +26.4/-15.2 25.1 1.030 20.5
3 05.6/-44.8 +4.51/+2.60 +25.6/-15.2 25.1 1.020 20.0
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 03 November 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-046 FOT 49907 302/0122 NA TAC Crashed
00-047 FOT 49973 306/1145 14170 Generic Late Acq.
00-047 FOT 49996 308/0030 14170 Generic Late Acq.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-042 FOT see list Oct 00 14170 Generic Late Acq.
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-047 FOT see list Nov 00 14170 Generic Late Acq.
SEVNTFW00/43