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UARS WEEKLY STATUS REPORT - 17 Nov 2000
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SOLSTICE
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SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Some special processing will need to be done to retrieve the solar data
during this week's yaw offset because of the SSPP's late acquisition of the
sun. With the return to nominal attitude, this is no longer a problem.
During our continued testing of the OA_SSPP_ATT engineering patch, we
discovered a deficiency and relayed that back to the CDHF and CSC
programmers.
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SUSIM
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SUSIM was unable to make any scans during the recent YAW offset period.
The reason was that SSPP operations were disrupted because of an
inability to plan for this situation. Afterward, normal yaw orientation
was restored, SUSIM resumed daily solar scans of the sun during periods
of predicted telemetry.
We are preparing to begin the reprocessing the SUSIM UV spectral
irradiances to data version V21 in the next few weeks.
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ACRIM
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Nothing received.
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PEM
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The PEM zenith spectrometers are activate in daylight mode.
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).
The PEM team is working on replacing the PEM:: machine with a DEC Alpha
machine to be called PEM2K::. PEM:: is now over 10 years old and its hardware
is now very difficult and costly to maintain. PEM:: is also showing signs
of slowly failing, and it is doubtful that PEM:: could be repaired if it failed.
The PEM system depends on PEM:: for instrument commanding and telemetry flow,
so it is an integral part of the PEM ground system. Current tests of telemetry
transfers through PEM2K:: have been successful.
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
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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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Daily processing of instrument Daily Activity Plans continues
with no problems. The MPG continues to coordinate with the
Flight Operations Team and to assist the Project Scientist
with the scheduling of instrument operations. The published
instrument operations schedule is complete to 3 January 2001.
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CDHF
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DAAC DATA:
- Data received and cataloged at the CDHF in the month of Sept., 2000 for
HALOE, NMC, and UKMO has been previewed in preparation for DAAC Transfer.
UARS CDHF REHOST:
- PI validation of output products and concerns are being addressed.
SUSIM reason for differences is being confirmed with COMPAQ.
- System performance criteria is being confirmed.
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FOT
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REPORTING PERIOD
This report covers 04 November 2000 (Orbit 50011, GMT Day 309) through
10 November 2000 (Orbit 50115, GMT Day 315).
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 310/0359 50028 Power ON - FULLTIME
SUSIM 313/1715 50081 Halted
PEM 314/2226 50100 ZEPS & NEPS to day only
PEM 315/0200 50102 DAY OPS ONLY
WINDII 315/0416 50103 Power ON
WINDII 315/0837 50106 Power OFF
WINDII 315/1719 50111 Power ON
WINDII 315/1804 50112 Power OFF
The beta angle ranged between the angles of 52.7 degrees to 76.1 degrees
for this report period. The beta angle is now decreasing towards a
minimum angle of 2 degrees on 3 December 2000 (DOY 337).
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 0.0 degrees C. Additional battery
performance data for each battery on 3 November 2000 and 10 November
2000 are provided in Appendix D.
The clock error ranged from -8.6 to 12.1 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 = 04
¥ ALERTS = 02
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
¥ FOT = 14
¥ SUSIM = 01
¥ PEM = 03
¥ WINDII = 04
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
¥ FOT = 07
One (1) Anomaly Report remained OPEN at the end of this report period
(see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/221 - 2287.496937
· Transponder B: 00/305 - 2287.499087
GROUND SYSTEM OPERATION
Seven (7) 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 00/314 show the observatory data loss to
be 299 hours, 20 minutes, 15.664 seconds (an increase of 34 minutes and
49.200 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 34 minutes and 49.200 seconds occurred over three (3)
days:
· 32 minutes 14.976 seconds on Day 309 due to an ATC halt on S/C
· 0 minutes 13.504 seconds on Day 312 due to a data hit.
· 2 minutes 20.720 seconds on Day 314 due to a Forward Reacquisition
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
On 06 November 2000 a +10 degree yaw offset maneuver was performed.
This was done as a preliminary test for the +10 degree yaw offset, which
will be performed on 07 November 2000 over the course of the high beta
incident this as well as part of next week. The yaw offset is necessary
to bring the sun back into the field of view of the Fine Sun Sensor
(FSS).
Testing continues daily to get the TAM and FSS attitude control solution
operational. The UARS testing and training simulator (UTTS) is being
used for all testing. In order to insure the validity of the test the
FOT has been debugging some problems with the simulator attitude models.
MEETINGS
No meetings were attending by the FOT during the course of this week.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for December 02, 2000 (DOY 337).
This maneuver will be a Reverse to Forward Flight maneuver (Northern
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 10 November 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
50012 309/0211 00-616 NBTR PLAYBACK
50014 309/0511 00-616 NBTR NOOPS D-309
50026 309/2356 00-619 ATC LOCATION JUMP
50026 310/0032 00-618 NBTR PLAYBACK
50028 310/0359 00-620 PEM Power ON - FULLTIME
50029 310/0513 00-621 OBC Clk Adj 0.00 to 20.6 msec/day
50034 310/1348 00-618 NBTR PLAYBACK
50045 311/0733 00-622 NBTR PLAYBACK
50049 311/1345 00-623 ACS YAW S/C 10 deg.
50051 311/1623 00-624 ACS YAW S/C back to 0 deg.
50053 311/2035 00-625 ACS UFLTR FSS to monitor mode
50064 312/1348 00-626 ACS YAW S/C 10 deg.
50073 313/0338 00-627 OBC Clk Adj 20.6 to 41.2 msec/day
50075 313/0736 00-628 NBTR PLAYBACK
50076 313/0833 00-629 NBTR RECORD STOP - HI TEMP
50081 313/1715 00-630 SUSIM Halted
50100 314/2226 00-631 PEM ZEPS & NEPS to day only
50102 315/0200 00-632 PEM DAY OPS ONLY
50103 315/0416 00-633 WINDII Power ON
50106 315/0837 00-634 WINDII Power OFF
50111 315/1719 00-633 WINDII Power ON
50112 315/1804 00-635 WINDII Power OFF
________________________________________________________________________
_
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 10 November 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
QTZEPIF1 Y-LO ZEPS INTERFACE TEMP 1 50073-6
NBTUTEMP2 Y-LO NBTR 2 TEMP 50074-6
NBTUTEMP2 R-LO NBTR 2 TEMP 50076,83-85
CDRIUABINTRT Y-LO RIU 1 Internal temperature 50093-50100
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
SSSWLIMFAIL SSPP AT SOFTWARE STOP 50015
HGSWLIMFAIL High Gain software limit reached 50051
________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 10 November 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ------- ---------------------------------
50029 310/0522 Clk Adj from 0.00 to 20.6 msec/day
50073 313/0341 Clk Adj from 20.6 to 41.2 msec/day
________________________________________________________________________
_
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 10 November 2000
03 Nov 2000 - GMT Day 308 Beta = 48.9 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 +728.0/+728.0 -3.05/-4.62 +0.0/+0.0 14.2 0.000 0.0
2 +22.4/-22.4 +5.15/+3.87 +26.4/-15.2 25.1 1.030 20.5
3 05.6/-44.8 +4.51/+2.60 +25.6/-15.2 25.1 1.020 20.0
10 Nov 2000 - GMT Day 315 Beta = 76.1 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 -2.73/-3.05 +0.0/+0.0 14.2 0.000 0.0
2 +11.2/0.0 +2.60/+2.60 +15.6/+9.6 31.7 1.040 13.6
3 0.0/-28.0 +1.97/+1.97 +09.6/+9.2 31.7 1.040 13.1
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 10 November 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-048 FOT 50025 309/2255 N/A ATC HALT
00-047 FOT 50037 310/1853 14170 Generic Late Acquisition
00-049 FOT 50051 311/1623 N/A HGA at S/W stop limit
00-047 FOT 50081 313/1715 14170 Generic Late Acquisition
00-047 FOT 50088 314/0414 14170 Generic Late Acquisition
00-047 FOT 50089 314/0657 14170 Generic Late Acquisition
00-047 FOT 50108 315/1209 14170 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
00-047 FOT see list Nov 00 14170 Generic Late
Acquisition
00-048 FOT 50025 309/2255 N/A ATC HALT
00-049 FOT 50051 311/1623 N/A HGA at S/W stop limit
SEVNTFW00/43