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UARS WEEKLY STATUS REPORT - 12 Dec 1997
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SOLSTICE
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SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.
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SUSIM
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Nothing received.
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PEM
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Nothing received.
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HALOE
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Nothing received.
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MLS
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The MLS instrument has been powered off since Dec 2. MLS is scheduled to
begin south viewing operations on Dec 22.
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HRDI
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HRDI is on and operating normally.
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WINDII
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Nothing received.
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MPG
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Routine processing of instrument Daily Activity Plans continues
with no problems. The MPG continues to assist the Project
Scientist with the scheduling of instrument operations.
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CDHF
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UARS CDHF Status Week Ending December 12, 1997
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The CDHF will be unavailable on 12/13/97, 11:00 - 16:30 GMT. A GSFC power
outage in building 1 will disable all network connectivity at GSFC during this
time. CDHF will remain up, but unavailable via the network.
The CDHF has received a total of 352 CD-ROM requests as of 12-December-97. Two
new CD-ROM orders were received and shipped this week.
The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
(C) = Complete, (F)= Failed (L) = Days remaining to reprocess.
25 days PEM (3.32) Prod (1350R-660C=690L)
The CDHF is previewing the October 1997 DAAC data created for HALOE,
HRDI, PEM, NMC, and UKMO.
The CDHF received CLAES Version 7.0 Engineering software and will begin
testing the designated UARS DAYS.
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FOT
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REPORTING PERIOD
This report covers 28 November 1997 (Orbit 33967, GMT Day 332) through 05
December 1997 (Orbit 34072, GMT Day 339).
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
MLS 336/2304 34027 Off
HALOE 337/0239 34029 On
HALOE 337/1808 34039 Off (high temp)
HALOE 337/1945 34040 On
HALOE 338/0707 34047 Off (high temp)
HALOE 338/0853 34048 On
PEM 338/1451 34052 AXIS off, ZEPS on
HALOE 338/2148 34056 Off (high temp)
HALOE 338/2249 34057 On
HALOE 339/2304 34072 Off (high temp)
The beta angle is now decreasing toward a minimum angle of 0.0 degrees on
17 December 1997 (DOY 351).
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 26.1 end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and
Battery 3 of 1.3 degrees C. Additional battery performance data for each
battery on 29 November 1997 and 05 December 1997 are provided in Appendix
D.
The clock error ranged from -14.3 to +10.7 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.
% ALERTS = 01
% OUT-OF-LIMITS = 08
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 04
% HALOE 08
% MLS 01
% PEM 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 03
TRANSPONDER FREQUENCIES:
Transponder A: 97/301 - 2287.497086
Transponder B: 97/302 - 2287.499098
GROUND SYSTEM OPERATION
Two (2) operational support problem(s) 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 97/338 show the observatory data loss to be
20 hours, 41 minutes, 12.916 seconds (an increase of 10.624 seconds). This
is a 0.0380 percent data loss which equals a 99.9620 percent data capture
for the mission.
The increase of 10.624 seconds occurred on Day 338 and resulted from
insufficient tape recorder overlap.
SOLSTICE operations requested execution of several addition SSPP Solar
Offset experiments next week. These experiments are identical to the
normal solar offset that is performed on a weekly basis.
Work began this week on modifications to the OBCSTF resident POCC database.
Several minor modifications are planned and a new database (version 65)
will be tested and released before the next yaw maneuver on 17 December
1997.
A revised receiver frequency has been calculated that meets the requirement
that the ratio between the transmit frequency and the receive frequency
must be 240/221 (=1.085972851).
The FOT is still working out the details of participating in the IP return-
link telemetry test that the network is conducting.
Flight Dynamics Facility (FDF) continues the generation process for a new
Star Catalog to fix the invalid precession rate for star 48000001.
No testing of the new CMS software release (R7B1V2) occurred this week.
The stored command verification problem - time to complete - associated
with Applications Processor (AP) software release 10.08 has been corrected
and is ready to be tested on the UARS simulator. The simulation will most
likely be initiated Wednesday of next week.
OTHER SIGNIFICANT EVENTS
Monitoring of the magnetic field model performance continues.
FOT continues to improve a Power Profile for UARS based on the current
status of the Modular Power System.
FOT continues to support the new UARS ground system re-engineering effort.
MEETINGS
No UARS Battery telecon was held this week. The next telecon has not been
scheduled.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is currently scheduled for 17 December
1997 at 311/132708.
The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust
will probably be required in mid-1998.
FACILITIES
no change
PERSONNEL CHANGES
None
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 05 December 1997
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
33995 334/1939 97-597 OBC Clk Adj fr 41.2 to 20.6 msec/day
34016 336/0515 97-598 OBC Clk Adj fr 20.6 to 41.2 msec/day
34027 336/2304 97-599 MLS Power OFF
34029 337/0239 97-600 HALOE Power ON
34037 337/1447 97-601 OBC Clk Adj fr 41.2 to 20.6 msec/day
34039 337/1808 97-602 HALOE Power OFF
34040 337/1945 97-603 HALOE Power ON
34047 338/0707 97-604 HALOE Power OFF
34048 338/0853 97-605 HALOE Power ON
34052 338/1451 97-606 PEM AXIS OFF AND ZEPS ON
34053 338/1637 97-607 OBC Clk Adj fr 20.6 to 0.00 msec/day
33056 338/2148 97-608 HALOE Power OFF
33057 338/2249 97-609 HALOE Power ON
34072 339/2304 97-610 HALOE Power Off
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 05 December 1997
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
ACHTRI2 R-LO ACRIM Heater Current 2 33968-042
ACHTRV2 R-LO ACRIM Heater Voltage 2 33968-042
NBBTAPEPOS R-LO NBTR B TAPE POSITION 33979,055
QTZEPSIF1 Y-LO ZEPS I/F PLATE TEMP AFT 34008,10
QTZEPSIF2 Y-LO ZEPS I/F PLATE TEMP FWD 34008,10
PWTMPS1 Y-HI BOTTOM LEFT BASE PLATE TEMP 34011,64
OBSSOC2 Y-LO Battery 2 Current SOC 34064
HATBAT Y-HI HALOE Bolometer Area Temp 34069-72
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
WIERRLIMIT WINDII Software Error Code 34062
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 05 December 1997
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
33995 334/19:45 (30 Nov 97) from 41.2 to 20.6 msec/day
34016 336/05:24 (02 Dec 97) from 20.6 to 41.2 msec/day
34037 337/14:50 (03 Dec 97) from 41.2 to 20.6 msec/day
34053 338/16:40 (04 Dec 97) from 20.6 to 00.0 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 05 December 1997
29 Nov 1997 - GMT Day 333 Beta = 74.9 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 -2.42/-4.26 +0.0/ +0.0 18.7 0.000 0.0
2 +11.2/ -16.8 +3.66/+1.99 +16.8/-15.9 27.0 1.034 15.9
3 +22.4/ -22.4 +2.60/+1.34 +16.0/-15.3 27.0 1.037 15.1
05 Dec 1997 - GMT Day 339 Beta = 52.0 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 -3.68/-4.94 +0.0/ +0.0 18.7 0.000 0.0
2 +33.6/ -22.4 +5.15/+3.87 +26.7/-15.2 26.2 1.026 21.2
3 +67.2/ -11.2 +3.87/+2.60 +25.6/-15.2 26.1 1.027 20.4
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 05 December 1997
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
97-119 FOT 33991 334/1255 14170 Generic Late Acquisition
97-125 FOT 34029 337/0239 N/A Remote KCRTUs not up.
97-124 FOT 33057 338/2333 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
97-119 FOT SIX n/a 14170 NOV GENERIC LATE ACQ
97-122 FOT 33937 330/22:39 TAC CRASH
97-123 FOT 33945 331/12:02 TAC CRASH
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period