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UARS WEEKLY STATUS REPORT - 24 NOV 2000
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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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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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On 21 November the MPG participated in the UARS Status Meeting
which was held to report the status of efforts to use data from
the three-axis magnetometer (TAM) for attitude control of the
UARS spacecraft. At this meeting it was reported that
development and testing of flight software is nearing completion.
Tentative plans, assuming no new problems are discovered during
further testing, are to uplink the software changes to the on-
board computer during the week of 4-8 December 2000, and then
begin on-board processing of TAM data in "monitor" mode.
(Attitude control of UARS will continue to use the Fine Sun
Sensor, backed up by ground processed TAM data, until reliable
operation of the on-board TAM data processing is verified.)
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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STATUS
The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
(C) = Complete, (F)= Failed (L) = Days remaining to reprocess.
2 days SEN (5.0) PROD (1992) (2R-2C=0L)
DAAC DATA:
- Some DAAC MLS V5 data has been transferred to the DAAC.
- WINDII requested Version 11 be sent to the DAAC from start of mission to
31-Aug-1997. WINDII is in the process of updating the UARS_QUALITY
field which is a DAAC requirement.
UARS CDHF REHOST:
- Need positive response from all PI End Users prior to Rehost transition.
- PI validation of output products and concerns are being addressed.
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FOT
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REPORTING PERIOD
This report covers 11 November 2000 (Orbit 50116, GMT Day 316) through 17
November 2000 (Orbit 50220, GMT Day 322).
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
SUSIM 321/1729 50201 Resume Ops
PEM 322/1406 50214 AXIS ON
WINDII 322/1949 50218 Power ON
The beta angle ranged between the angles of 76.1 degrees to 60.8 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 1.2 and 0.9 degrees C respectively. Additional battery performance data
for each battery on 10 November 2000 and 17 November 2000 are provided in
Appendix D.
The clock error ranged from Ð11.0 to 10.8 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 = 02
¥ ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
¥ FOT = 15
¥ SUSIM = 01
¥ PEM = 01
¥ WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 08
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
Eight (8) 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 00/321 show the observatory data loss to be 301 hours, 06
minutes, 51.616 seconds (an increase of 01 hours, 46 minutes and 35.952 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 01 hours, 46 minutes and 35.952 seconds occurred over three (3)
days:
· 0 minutes, 24.400 seconds on Day 315 due to a data hit
· 49 minutes, 25.744 seconds on Day 316 due to a S/C ATC halt TTR# 23135
· 51 minutes, 42.896 seconds on Day 317 due to Interface card problems at
White Sands
· 01 minutes, 18.512 seconds on Day 318 due to Late acquisition TTR#14170
· 03 minutes, 30.304 seconds on Day 319 due to Late acquisition TTR#23157
· 0 minutes, 14.096 seconds on Day 321 due to a data hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
On 07 November 2000 a +10 degree yaw offset maneuver was performed. This was
done in order to maintain sun presence over the course of the high beta period.
On November 11, it became necessary to yaw the spacecraft an additional degree
in the positive direction making the total an 11 degree yaw in order to keep
the sun in the field of view of the FSS. The spacecraft was then yawed back to
its previous +10 degree yaw attitude on November 13 where it remained until the
November 14th yaw which would bring the spacecraft back to a 0 degree yaw
offset.
UARS also experienced an Absolute Time Command Processor halt on 11 November
2000. This anomaly was due to the fact that the second segment of the ATC was
not loaded. Since all of the transmitter on commands are stored in the ATC the
subsequent pass was missed and the data lost was nonrecoverable. The last pass
taken before the halt was a non-coherent pass so the commands to put the
spacecraft into coherent mode were also sent manually before nominal operations
could continue.
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
The FOT attended a SERB meeting on November 15, 2000 at 2:00 pm.
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 17 November 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
50117 316/0236 00-636 OBC JUMP ATC LOCATION
50118 316/0342 00-637 OBC XMTR NOOPS D-316
50118 316/0342 00-638 CDH SWITCH TO COHERENT MODE
50120 316/0741 00-639 OBC Clk Adj from 41.2 to 20.6 msec/day
50120 316/0741 00-640 OBC GENASCII TABLE 51
50121 316/0923 00-641 OBC GENASCII TABLE 51 (YAW -1 DEG)
50133 317/0419 00-642 CDH SWITCH TO COHERENT MODE
50142 317/1806 00-643 OBC Clk Adj from 20.6 to 40.1 msec/day
50155 318/1542 00-644 MACS YAW FROM 11 DEG TO 10 DEG
50179 320/0524 00-645 NBTR IN RECORD
50180 320/0702 00-645 NBTR STOP - HI TEMP
50181 320/0848 00-645 NBTR PLAYBACK
50186 320/1630 00-1630 OBC Clk Adj from 41.2 to 20.6 msec/day
50200 321/1548 00-647 OBC/ACS YAW BACK TO 0 DEG OFFSET
50201 321/1631 00-647 OBC/ACS LOAD NOMINAL RATE ERROR LIMITS
50201 321/1729 00-648 SUSIM RESUME OPS
50214 322/1406 00-649 PEM AXIS ON
50218 322/1949 00-650 WINDII Power ON
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 17 November 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
NBTUTEMP2 Y-LO NBTR TU TEMP 50179-181
NBTUTEMP2 R-LO NBTR TU TEMP 50180
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 17 November 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ------- ---------------------------------
50120 316/0744 Clk Adj from 41.2 to 20.6 msec/day
50142 317/1820 Clk Adj from 20.6 to 41.2 msec/day
50186 320/1634 Clk Adj from 41.2 to 20.6 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 17 November 2000
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
17 Nov 2000 - GMT Day 322 Beta = 60.8 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 14.2 0.000 0.0
2 +11.2/-22.4 +3.87/+2.60 +23.2/-14.4 26.7 1.030 16.8
3 +11.2/-33.6 +2.60/+1.66 +24.4/-13.6 26.7 1.020 16.4
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 17 November 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-050 FOT 50116 316/0050Z 23135 ATC HALT & S/C MISCONFIG
00-051 FOT 50131 317/0053 23142 TDRSS-E down: 10:42 D/L
00-051 FOT 50132 317/0238 23142 TDRSS-E down: 10:42 D/L
00-052 FOT 50133 317/0419 23142 WSGT ground system prob.
00-047 FOT 50147 318/0240 14170 Generic Late Acquisition
00-053 FOT 50168 319/1113 23157 Late Acquisition
00-047 FOT 50185 320/1546 14170 Generic Late Acquisition
00-047 FOT 50206 322/0027 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-048 FOT 50025 309/2255 N/A ATC HALT
00-049 FOT 50051 311/1623 N/A HGA at S/W stop limit
00-050 FOT 50116 316/0050Z 23135 ATC HALT & S/C MISCONFIG
00-051 FOT 50131 317/0053 23142 TDRSS-E down: 10:42 D/L
00-052 FOT 50133 317/0419 23142 WSGT ground system prob.
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-
053 FOT 50168 319/1113 23157 Late Acquisition
SEVNTFW00/46