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UARS WEEKLY STATUS REPORT - 13 JUL 2001
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SOLSTICE
***********
Nothing received.
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SUSIM
***********
SUSIM has completed its daily solar scans this past week during periods
of predicted UARS telemetry.
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ACRIM
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Nothing received.
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PEM
***********
***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****
The PEM team reports that the PEM:: node computer has failed and has
been taken off line. PEM:: appears to have hardware problems that take the
system down every few hours. Automatic transfer NRT tests to PEM2K from
both CDHF2 and CDHFB have succeed and the NRT files have been verified against
those captured by PEM, which confirm the NRT process is correct. Thus, PEM
confirms NRT data from CDHFB. Thanks to Steve Bove for his work assisting
PEM with this process.
PEM/AXIS was activated in its half power mode on June 24 and deactivated
on June 27. The PEM/AXIS was reactivated in full power mode on July 3. At
the current time, AXIS is not generating energy deposition. SwRI is looking
into this. Tests of AXIS production code on the rehost computer are continuing.
At the present time, PEM energy deposition from its spectrometers is not
being generated. Recent data configuration changes have affected PEM software
causing multiple failures. These failures are being reviewed by the PEM team.
In order to correct for new telemetry requirements, PEM will need to update
processing code with a patch delivery. The delivery patch may include changes
which would allow the PEM software to execute on a DEC Alpha machine. GSFC is
helping PEM with some DEC Alpha particulars which have caused PEM level 3
code to fail on DEC Alpha machines (software below level 3 executes on the
DEC Alpha).
Updated HEPS calibration parameters have been finalized and are ready for
delivery. Updated MEPS quality calibration files have been finalized and are
ready for delivery. Level 3 software errors, discovered by Dr. Dean Pesnell,
have been fixed; his suggestions have been incorporated with in the PEM
production code. Both updated HEPS and MEPS calibration data, along with the
Level 3 code changes, will influence the in-situ energy deposition predictions,
so new versions of PEM energy deposition Level 3 files will be generated.
*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
***********
HALOE continues to operate successfully. All engineering parameters are
within nominal operating range. HALOE was powered off at the
beginning-of-day today as scheduled. Special calibration sequences were
commanded during some sunrise and sunset events to verify instrument
alignment and end to end gain.
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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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Daily processing of instrument Daily Activity Plans
continues with no problems.
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CDHF
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DAAC DATA:
- CLAES (output 9) created in August, 1999 has been loaded to the DAAC
Transfer Tables.
- UKMO,NMC and HALOE created in May, 1999 has been previewed in
preparation for sending to the DAAC.
UARS CDHF REHOST:
- Current day production processing continues to be processed only on the
rehost system and is going well.
- NRT was moved July 12 to CDHFB.
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FOT
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REPORTING PERIOD
This report covers 30 June 2001 (Orbit 53581, GMT Day 181) through 06 July 2001
(Orbit 53685, GMT Day 187).
SPACECRAFT OPERATION
The observatory is now in Forward Flight (Southern Hemisphere viewing) and is
performing nominally under two-battery operations. The instrument operational
changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
SOLSTICE 182/1138 53603 Power On
SUSIM 182/1415 53604 Power On
ACRIM 182/2116 53609 Power On
PEM 183/2339 53625 AXIS On
HALOE 184/2257 53640 Power On
The beta angle ranged between the angles of 5.6 degrees to 29.3 degrees for
this report period. The beta angle is now increasing towards a maximum angle
of 78 degrees on 20 July 2001 (DOY 201).
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 1.2 to 1.6 degrees C. Additional battery performance data for each
battery on 29 June 2001 and 6 July 2001 are provided in Appendix D.
The clock error ranged from Ð8.9 to 0.6 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 = 09
¥ HALOE = 03
¥ SOLSTICE = 01
¥ ACRIM = 01
¥ SUSIM = 04
¥ HRDI = 02
¥ PEM = 02
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ HALOE = 01
¥ FOT = 01
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: 01/119 - 2287.499116
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 01/186 show the observatory data loss to be 302 hours, 44
minutes, 57.624 seconds. This shows a loss of 1 hour, 04 minutes and 12.784
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 1 hour, 04 minutes and 12.784 seconds occurred over five (5)
days:
· 1 hour and 40.592 seconds on Day 180 due to Station preserving power for
YAW maneuver.
--No science data was lost
· 2 minutes and 07.488 seconds on Day 181 due to No Data -- Overlap
· 37.632 seconds on Day 182 due to a Data Hit
· 47.072 seconds on Day 183 due to a Data Hit
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
An instrument anomaly was experienced on 05 May 2001. The instrument involved
was the ACRIM II instrument. All ACRIM telemetry for currents and voltages all
dropped to zero values suddenly. The ACRIM team in coordination with the
UARSFOT conducted analysis and command tests to determine the cause of the
anomaly. Analysis shows that the anomaly was caused by failed circuitry in the
ACRIM electronics box. The FOT is awaiting a future plan of action from the
ACRIM team.
The software test team, in conjunction with the FOT, has completed a large
portion of the testing for the new front end processor. The new TAC still has
yet to undergo DSN and realtime TDRS testing, but has completed simulations of
receipt of telemetry, commanding, and NCC/GCMR testing. DSN testing is
scheduled for 18 July 2001.
UARSFOT will also begin supporting testing of the rehosted UARS ground system.
A prototype system has been built in accordance with the UARS documentation and
operational database. A meeting will be held on 10 July to determine the test
plan.
UARS attitude has been adjusted over the course of the last few yaw cycles by
loading new alignment matrices for the TAM. Good alignments have been found
for both directions of flight and the performance of the TAM should remain
stable and accurate.
MEETINGS
The FOT held the UARS Three TDRS Kickoff Meeting on 03 July 2001. This meeting
was established to track the progress and resolve problems of all entities
involved in the implementation of the three TDRS mode. This meeting will
become a biweekly meeting until the three TDRS mode is operational.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 08 August 2001 (DOY 220). This
maneuver will be a Forward to Reverse 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 06 July 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
53603 182/1138 01-431 SOLSTICE Power ON - Fulltime
53604 182/1415 01-432 SUSIM Power ON - (Partial)
53607 182/1748 01-433 SUSIM Additional Commands
53609 182/2116 01-434 ACRIM Power ON
53618 183/1139 01-432 SUSIM Power ON - CONTINUED
53618 183/1236 01-435 SUSIM Power ON - COMPLETE
53619 183/1319 01-436 PEM ZEPS / HEPS DAY-ONLY
53625 183/2339 01-437 PEM Power ON AXIX 1 & 2
53637 184/1753 01-438 NBTR NOOPS D-185
53640 184/2257 01-439 HALOE Power ON
53644 185/0623 01-438 NBTR NOOPS D-185
53644 185/0623 01-440 HALOE Power ON complete
53646 185/0918 01-441 HALOE SR & SS corrections
53652 185/1755 01-442 NBTR NOOPS D-186
53658 186/0453 01-442 NBTR NOOPS D-186
53668 186/1757 01-443 NBTR NOOPS D-187
53673 187/0441 01-443 NBTR NOOPS D-187
53680 187/1501 01-444 OBC/TAM TAM UPDATE
53681 187/1611 01/443 NBTR NOOPS D-187
53682 187/1758 01-445 NBTR NOOPS D-188
____________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 06 July 2001
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
HACS4 Y-HI GIMBLE LIMIT 53646
HAMFCAT R-HI TELESCOPE BARREL#3 TEMP 53646
HATBLT3 R-HI MAIN FRAME COLD TEMP 53646
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 06 July 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 06 July 2001
29 June 2001 - GMT Day 180 Beta = 1.7 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 -3.05/-4.94 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-100.8 +5.47/+3.87 +28.0/-12.8 24.5 1.040 19.8
3 +22.4/-39.2 +4.51/+2.60 +27.2/-13.2 24.5 1.030 19.5
6 July 2001 - GMT Day 187 Beta = 29.3 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 -3.05/-4.31 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-134.4 +5.79/+4.51 +28.4/-14.4 24.8 1.030 20.7
3 +22.4/-56.0 +4.83/+3.23 +28.0/-15.2 24.8 1.020 20.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 06 July 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-040 HALOE 53646 185/0814 N/A HALOE LIMITS OOL
01-041 FOT 53681 187/1634Z 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-032 FOT see list June 01 14170 Generic Late Acquisition
01-040 HALOE 53646 185/0814 N/A HALOE LIMITS OOL
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
------ ------ ----- ---- --- -----------------
01-041 FOT see list July 01 14170 Generic Late Acquisition
SEVNTFW01/27