********************************************************************
UARS WEEKLY STATUS REPORT - 4 April 2003
********************************************************************
***********
SOLSTICE
***********
During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods.
***********
SUSIM
***********
SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and occultation scans during periods of UARS telemetry.
***********
ACRIM
***********
Nothing received.
***********
PEM
***********
Nothing received.
***********
HALOE
***********
Nothing received.
***********
MLS
***********
Nothing received.
***********
HRDI
***********
Nothing received.
***********
WINDII
***********
Nothing received.
***********
MPG
***********
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.
***********
CDHF
***********
Nothing received.
***********
FOT
***********
REPORTING PERIOD
This report covers 22 March 2003 (Orbit 63044, GMT Day 081) through
28 March 2003 (Orbit 63149, GMT Day 087).
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 081/2205 63058 AXIS TO 7 WATTS
HALOE 082/1302 63067 POWER ON
HALOE 084/1257 63097 POWER OFF
HALOE 084/1437 63098 POWER ON
The beta angle ranged between the angles of 55.5 degrees to 40.6
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 1.27 to 1.28 degrees C. Additional
battery performance data for each battery on 21 March and 28 March
2003 are provided in Appendix D.
The clock error ranged from -10.5 to 10.3 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 = 03
PEM = 01
HALOE = 03
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Three (3) Anomaly Report remained OPEN at the end of this report
period (see Appendix E).
GROUND SYSTEM OPERATION
Two (2) 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
Two operational problems occurred this week on UARS. The first
problem, which is fairly minor, occurred on the 082/1624-1651 UTC
event. The operator attempted to send the day 082 SOLSTICE microload
and received an error message, which informed him that the system had
an invalid state for command. This message is almost always
indicative of the COP status changing from active to initial. This
was true for this case as well. Further investigation showed that the
command counters had gone out of synch on the previous 082/1526-1551
event. No commands were sent on this pass, but a plot of both the
ground counter and spacecraft command counter showed both counters
moving from their proper value at different times prior to the
anomalous pass. The FOT believes the VCC counter moved due to a bad
frame received only 1/10 of a second before the jump, but the ground
counter will have to be investigated by the Raytheon team.
The second operational problem seen this week was on the 085/0554-0623
UTC event. This pass was an SSA event scheduled for the tape recorder
dump of HALOE data. The FOT showed no data at AOS and informed White
Sands and proceeded to send four forward reacquisition GCMRs. The
GCMRs did not acquire data and White Sands stated that they showed RF
but no lock. They worked the issue for the entire pass duration and
were unable to fix the problem. This caused the FOT to have to
playback the data on the 085/1120-1141 UTC SSA event, which was
originally scheduled for the FDF playback. The FDF playback was
cancelled and will be performed next week as scheduled. The FOT
double checked the setup commands in the stored command load as well
as the scheduled SHO in the UPS system, and could not find anything
out of the ordinary. Therefore, the FOT is awaiting results of the
investigation at White Sands.
MEETINGS
-None this report period
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 28 March 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63058 081/2205 03-069 PEM AXIS TO 7 WATTS
63067 082/1302 03-070 HALOE POWER ON
63068 082/1443 03-071 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
63097 084/1257 03-072 HALOE POWER OFF
63098 084/1437 03-073 HALOE POWER ON
63109 085/0736 03-074 NBTR NOOP LOCATION 468 (RECORD SEGMENT)
63113 085/1435 03-075 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 28 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 28 March 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63068 082/1446 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
63113 085/1441 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 28 March 2003
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
28 March 2003 - GMT Day 087 Beta = 40.6 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 -173.6/-201.6 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.00
2 +11.2/-112.0 +6.11/+4.83 +27.6/-15.6 24.2 1.030 21.1
3 +22.4/-67.2 +5.15/+3.87 +27.2/-15.6 24.0 1.020 20.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 28 March 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-010 FOT 63108 085/0554 32514 No Acquisition (29 minutes)
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-005 FOT 62559 048/1757 32330 CDS Equipment problem
03-007 FOT 62918 072/1352 N/A Router Change / TLM hits
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
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-010 FOT 63108 085/0554 32514 No Acquisition (29 minutes)