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UARS WEEKLY STATUS REPORT - 01 FEB 2002
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SOLSTICE
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Nothing received.
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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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PEM has also noticed the effect reported by HALOE that the UARS Orbit and
Attitude Services (UOAS) software accesses the current processing day
file but bombs when accessing the next day file. Processing two consecutive
files is normal for PEM, which process orbit and attitude data across the day
(file) boundary. This error occurs on CDHFB:: and was not previously noticed
on CDHF2:: or when Production was processing PEM data. PEM has not checked
UOAS operation on CDHF2:: as yet.
An initial review of the PEM CICEL PROCs were conducted. Comments have
been submitted. The converted STOL procedures are not acceptable for use at
the current time. PEM is currently waiting for corrected versions of the
PEM CICEL PROC to conduct further reviews.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
PEM awaits support of the UARS Traceability Mission for the TIMED mission
and has requested meetings with a GUVI team representative.
*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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The MPG participated in the UARS Ground System
Rehost Meeting on 28 January 2002.
The MPG continues to serve as the point-of-contact
for UARS instrument operations to support re-engineering
of the UARS Mission Operations Concept to develop
capabilities for the Science Traceability Mission.
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 19 January 2002 (Orbit 56628, GMT Day 019) through
25 January 2002 (Orbit 567322, GMT Day 025).
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 021/2330 56672 AXIS-2 POWER OFF
HALOE 022/1238 56680 Power ON
The beta angle ranged between the angles of 68.19 degrees to 39.08
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 03 February 2002 (DOY 034).
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 25.44 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.25 to 1.31 degrees C. Additional
battery performance data for each battery on 22 December 2001 and 28
December 2001 are provided in Appendix D.
The clock error ranged from 9.5 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 = 2
PEM = 2
HALOE = 3
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 0
One (1) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 01/333 - 2287.496855
· Transponder B: 01/324 - 2287.498688
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). This service should resume soon.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT received the new delivery of the Eclipse software as expected
on 25 January 2002. This new release includes the loading capability
and should hopefully resolve the remaining telemetry issues.
Verifying these capabilities will be the focal point of simulator
testing this week. The load testing needs to be completed in order to
keep with the scheduled first load to the spacecraft next week.
MEETINGS
The FOT attended a UARS Ground System Rehost Meeting on Monday,
January 21, 2002.
The FOT attended a UARS Eclipse Working Meeting on Thursday, January
24, 2002.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 03 February 2002 (DOY 034).
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 25 January 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
56672 021/2320 02-019 PEM ZEPS/HEPS to DAY-ONLY OPS
56672 021/2330 02-020 PEM AXIS-2 POWER OFF
56679 022/0939 02-021 OBC Clk Adj 20.6 to 0.0 msec/day
56680 022/1238 02-022 HALOE Power ON
56680 022/1238 02-023 HALOE AZIMUTH FIX
56696 023/1313 02-024 HALOE STOW POSITION FIX
56715 024/1918 02-025 OBC Clk Adj 0.0 to 20.6 msec/day
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 25 January 2002
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 25 January 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
56679 022/0939 Clk Adj 20.6 to 0.0 msec/day
56715 024/1918 Clk Adj 0.0 to 20.6 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 25 January 2002
19 January 2002 - GMT Day 019 Beta = 68.19 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 -560.0/-728.0 -2.85/-3.77 +0.0/ -0.0 10.72 0.000 0.00
2 000.0/-224.0 +3.82/+2.52 +18.4/-13.2 27.04 1.040 15.15
3 +224.0/-224.0 +2.85/+1.88 +17.6/-12.8 27.04 1.040 14.91
25 January 2002 - GMT Day 025 Beta = 39.08 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 -504.0/-672.0 -3.77/-4.69 +0.0/ -0.0 10.72 0.000 0.00
2 +112.0/-448.0 +5.14/+4.48 +28.0/-14.4 25.76 1.030 20.74
3 +224.0/-112.0 +4.15/+3.17 +27.2/-14.4 25.44 1.020 20.39
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 25 January 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
02-002 FOT see list Jan 02 14170 Generic Late Acquisition