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UARS WEEKLY STATUS REPORT - 28 March 2003
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SOLSTICE
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SOLSTICE continues to perform nominally, taking solar data on all
available orbital tracking periods.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and occultation scans during periods of UARS telemetry.
The data integrity problems of NRT and other files copied
from the CDHF was found to be due to a problem in the networking
infrastructure at NRL. Many thanks to Mike Anderson of the CDHF
for his help in solving the problem.
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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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Nothing received.
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WINDII
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Nothing received.
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MPG
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The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.
Daily processing of instrument Daily Activity Plans continues
with no problems.
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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 15 March 2003 (Orbit 62939, GMT Day 074) through 21
March 2003 (Orbit 63043, GMT Day 080).
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
AXIS 1,2 077/1347 62993 POWER ON
The beta angle ranged between the angles of 51.9 degrees to 56.6
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 06 April 2003 (DOY 096).
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 23.6 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.26 to 1.27 degrees C. Additional
battery performance data for each battery on 14 March and 21 March
2003 are provided in Appendix D.
The clock error ranged from -10.4 to 10.9 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 = 04
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 00
Three (3) Anomaly Reports remained OPEN at the end of this
report period (see Appendix E).
GROUND SYSTEM OPERATION
Zero (0) operational support problems occurred this period. Anomaly
Reports are included in Appendix E.
The data loss calculations are no longer being supplied by Data
Capture Facility (DCF).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT began testing the new software release of the Eclipse software
(Version 2.1). This release contains several fixes in response to DRs
written, including wait statement and status buffer issues. Testing
showed that both the wait statement and status buffer problems had not
been fixed, so the Raytheon development team has been informed and
they will try to give us an updated build as soon as possible.
MEETINGS
-The FOT attended a PACOR-A meeting to discuss the processing of the 1
Kbps engineering data stream.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 06 April 2003 (DOY 096). This
maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
Attachments: Appendix A, Real-time Command 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 21 March 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62943 074/0705 03-064 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62978 076/1457 03-065 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62993 077/1347 03-066 AXIS 1,2 POWER ON
63010 078/1717 03-067 OBC CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
63038 080/1448 03-068 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 21 March 2003
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 21 March 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62943 074/0708 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62978 076/1503 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
63010 078/1717 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
63038 080/1452 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 21 March 2003
14 March 2003 - GMT Day 073 Beta = 47.9 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 -168.0/-190.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-140.0 +5.47/+3.87 +25.6/-16.0 24.8 1.030 20.2
3 +24.0/-44.8 +4.51/+2.92 +25.2/-16.0 24.8 1.030 19.8
21 March 2003 - GMT Day 080 Beta = 56.6 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 -168.0/-190.4 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-44.8 +4.19/+2.92 +23.2/-15.2 25.9 1.020 19.0
3 +22.4/-22.4 +3.23/+1.97 +22.4/-15.2 25.9 1.010 18.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 21 March 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-005 FOT 62559 048/1757 32330 CDS Equipment problem
03-007 FOT 62918 072/1352 N/A Router Change / TLM hits