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UARS WEEKLY STATUS REPORT - 08 Feb 2002
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SOLSTICE
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With the exception of Day only operations during the yaw maneuver this
week, SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
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SUSIM
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On 2/2/02, SUSIM was turned off, as usual, to conserve power during the
UARS yaw-around maneuver. On 2/6/02, SUSIM was repowered and on
2/7/02, daily mid-resolution and MgII solar scans resumed scheduled
during periods of predicted UARS telemetry.
Routine closed loop SSPP pointing was begun on Jan. 30. Preliminarily,
the results are terrific (< 1 arcmin) as expected. Of course, this
does not in any way diminish the miraculous improvement in the open
loop pointing and attitude control provided earlier by the UARS Project
Engineers. Great job!
Although current and some previous level 0 data have now been delivered
from the PACOR-A system, the backlog of level 0 data from the last few
months has not arrived, for the most part.
After several missing features and incompatibilities were overcome,
the software conversion of SUSIM's STOL procedures to the CECIL
system is complete and is awaiting testing.
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ACRIM
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Nothing received.
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PEM
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A detailed review of the PEM CICEL PROCs were conducted. 10 of 51 PROCs
were found to be missing. These need to be included in the CECIL conversion.
Of the 41 remaining PROCs, 39 of the CECIL PROCs were modified. PEM has
resubmitted the 39 CECIL PROCs and is waiting for the 10 missing CECIL PROCs
to be sent to PEM for review. PEM would like to know if the instrument
activation STOL procedures archived in the FOT are to be converted by GSFC.
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 7 February 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 26 January 2002 (Orbit 56733, GMT Day 026) through
01 February 2002 (Orbit 56837, GMT Day 032).
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 026/2323 56747 AXIS-1 Off
HALOE 031/2323 56822 Power Off
The beta angle ranged between the angles of 34.53 degrees to 09.65
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 1.31 to 1.25 degrees C. Additional
battery performance data for each battery on 26 January 2002 and 01
February 2002 are provided in Appendix D.
The clock error ranged from -11.4 to 6.1 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 = 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 = 1
PEM = 2
HALOE = 1
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 0
Zero (0) Anomaly Reports remained OPEN at the end of this report
period (see Appendix E).
TRANSPONDER FREQUENCIES:
ú Transponder A: 01/333 - 2287.496855
ú 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).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT tested loading capability of Eclipse versus the simulator this
week. The FOT was able to successfully perform a partial table load
without checksum, spacecraft and TDRS ephemeris loads, ATC loads, an
RTS load and a SUSIM microprocessor load. This was a great success
for Eclipse and keeps the reengineer effort on schedule for spacecraft
loads starting on 06 February 2002. The first load to be sent to UARS
will be a partial table load.
MEETINGS
The FOT attended a UARS Ground System Rehost Meeting on Monday,
January 28, 2002.
The FOT attended a UARS Eclipse Load Directory Structure Review on
Wednesday, January 30, 2002.
The FOT attended a UARS Eclipse Working Meeting on Thursday, January
31, 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 01 February 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
56747 026/2323 02-027 PEM AXIS-1 Off
56822 031/2323 02-028 OBC/CLK Clk Adj from 0.00 to -20.6 msec/day
56822 031/2323 02-029 HALOE Power Off
56837 032/2247 02-030 PEM Power Off
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 01 February 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 01 February 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
56822 031/2323 Clk Adj from 0.00 to -20.6 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 01 February 2002
26 January 2002 - GMT Day 026 Beta = 34.53 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 -50.4/-67.2 -3.77/-4.69 +0.0/ -0.0 10.72 0.000 0.00
2 +11.2/-33.6 +5.14/+4.48 +28.0/-14.4 25.44 1.020 20.97
3 +28.0/-16.8 +4.15/+3.17 +27.2/-14.0 25.44 1.020 20.62
01 February 2002 - GMT Day 032 Beta = 09.65 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 -44.8/-67.2 -4.08/-4.99 +0.0/ -0.0 10.72 0.000 0.00
2 +0.0/-33.6 +3.82/+3.50 +28.4/-12.8 26.40 1.030 19.22
3 +22.4/-22.4 +2.85/+2.20 +27.2/-12.4 26.24 1.030 18.64
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 01 February 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
------ ------ ----- ---- --- -----------------
02-002 FOT see list Jan 02 14170 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
-None this report period.