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UARS WEEKLY STATUS REPORT - 30 Mar 2001
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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. During this time of TDRSS only operations, SOLSTICE
is collecting sufficient data to fulfill our science processing requirements.
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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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Nothing received.
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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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HRDI continues to function normally, making wind measurements during
the sunlit parts of orbits nearly every day, and measuring nighttime winds
when power is available.
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WINDII
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Nothing received.
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MPG
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During this week a problem was encountered with the UARS
Command Management System. A workaround procedure has
been used to update instrument Daily Activity
Plans and microloads on the Command Management System
data base.
Instrument operations schedule is now complete
to 19 April 2001.
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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 17 March 2001 (Orbit 52005, GMT Day 076) through 23 March
2001 (Orbit 52110, GMT Day 082).
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
ACRIM 076/0018 52005 Power ON
SUSIM 076/0342 52008 Power ON (Start)
PEM 076/1257 52013 Power ON - Day Only
SUSIM 076/1449 52015 Power ON (Continuation)
SUSIM 076/1539 52015 Power ON (Completion)
SUSIM 077/2113 52034 Motor Commands
HALOE 078/0020 52050 Power ON PART 1
HALOE 079/1227 52058 Power ON, complete
The beta angle ranged between the angles of 05.6 degrees to 28.0 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 52 degrees on 02 April 2001 (DOY 074).
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 and 1.6 degrees C. Additional battery performance data for each
battery on 16 March 2001 and 23 March 2001 are provided in Appendix D.
The clock error ranged from Ð0.7 to 8.0 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 = 10
¥ ACRIM = 01
¥ SUSIM = 04
¥ PEM = 01
¥ HALOE = 02
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: 00/316 - 2287.496493
· Transponder B: 02/026 - 2287. 49920005
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 01/067 show the observatory data loss to be 300 hours, 1
minute, 12.760 seconds. This shows an overall increase of 43.296 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 43.296 seconds occurred over two (3) days:
á 14.304 seconds on Day 071 due to No Data Overlap
á 14.128 seconds on Day 074 due to No Data Overlap
á 14.864 seconds on Day 074 due to No Data Overlap
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
UARS is using both the Fine Sun Sensor (FSS) and the Three Axis Magnetometer
(TAM) as inputs to UFLTR this week. The FOT is pleased with their performance,
but continues to make adjustments to the TAM alignment to improve its
performance and UARSÕ attitude.
The FOT awaits the completion of the FSW patch that will improve the magnetic
field model from a 5th order to 7th order solution. The patch is currently begin
tested on the UARS Testing and Training Simulator (UTTS). Testing should be
completed in the next few weeks.
MEETINGS
The FOT attended a UARS Attitude Meeting on Monday, March 19, 2001
The FOT attended the UARS SERB Meeting on Wednesday, March 21, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 19 April 2001 (DOY 109). This maneuver
will be a Reverse to Forward Flight maneuver (Southern 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 23 March 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
52005 076/0018 01-168 ACRIM Power ON
52008 076/0342 01-169 SUSIM Power ON (Start)
52013 076/1257 01-170 PEM Power ON - Day Only
52015 076/1449 01-169 SUSIM Power ON (Continuation)
52015 076/1539 01-169 SUSIM Power ON (Completion)
52034 077/2113 01-171 SUSIM Motor Commands
52045 078/1544 01-172 OBC/TAM TAM Alignment
52047 078/1813 01-173 NBTR NOOPS D-079
52050 078/0020 01-174 HALOE Power ON PART 1
52055 078/0721 01-173 NBTR NOOPS D-079
52058 079/1227 01-175 HALOE Power ON, complete
52070 080/0722 01-176 NBTR NOOPS D-080
52077 080/1919 01-077 NBTR NOOPS D-081
52084 081/0617 01-177 NBTR NOOPS D-081
52090 081/1553 01-179 OBC/TAM Table 53 Update
52092 081/1920 01-178 NBTR NOOPS D-082
52099 082/0617 01-178 NBTR NOOPS D082
52107 082/1921 01-180 NBTR NOOPS D083
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 23 March 2001
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 23 March 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period
_______________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 23 March 2001
16 Mar 2001 - GMT Day 075 Beta = 01.5 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 +22.4/+0.0 -3.68/-4.94 +0.0/+0.0 13.0 0.000 0.0
2 +16.8/-89.6 +5.15/+4.19 +29.6/-13.6 25.3 1.020 20.4
3 +33.6/-44.8 +3.87/+2.92 +28.8/-13.2 25.3 1.020 20.0
23 Mar 2001 - GMT Day 082 Beta = 28.0 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 +39.2/+11.2 -3.05/-4.31 +0.0/+0.0 13.0 0.000 0.0
2 +16.8/-89.6 +6.11/+4.51 +28.8/-15.2 24.5 1.030 22.0
3 +33.6/-33.6 +5.15/+3.87 +28.8/-16.0 24.5 1.020 22.0
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 23 March 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-014 FOT 52091 081/1739 14170 Generic Late Acquisition
01-017 FOT 52056 079/0901 No AP for 1.5 hours
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-017 FOT 52056 079/0901 No AP for 1.5 hours
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
------ ------ ----- ---- --- -----------------
01-014 FOT see list Mar 01 14170 Generic Late Acquisition
SEVNTFW01/11