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UARS WEEKLY STATUS REPORT - 11 Sep 1998
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SOLSTICE
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SOLSTICE is currently in daylight only operations. During this limited
operation we are successfully gathering a full solar data set each day
however no stellar calibration measurements are made. Normal operations
will resume on Tuesday (98258).
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SUSIM
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SUSIM was turned off on Monday, Sept. 7. We expect to be turned back
on Monday, Sept. 14. While on, SUSIM successfully gathered its normal
solar, offset, and occulation data during this past week without
apparent problems.
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PEM
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PEM was not active
GSFC has proposed an OBC operation plan for the activation of PEM boom
instruments during the daylight portions of every orbit. This OBC operation
plan is accepted by PEM. PEM has proposed a series of test procedures for
activation and is waiting response from GSFC. PEM is also waiting for GSFC
scheduling and implementation of the OBC plan and its operation test procedures.
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HALOE
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HALOE continues successful operations with all engineering parameters being
nominal. Science data products continue to be excellent.
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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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Routine processing of instrument Daily Activity Plans continues
with no other problems. The MPG continues to assist the Project
Scientist with the scheduling of instrument operations.
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CDHF
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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.
76 days HAL (4.80) PROD (L1) (1873R-1389C-25F=459L)
62 days HAL (4.80) PROD (L3) (1873R-776C=1097L)
105 days SOL (4.62) PROD (L2-L3) (2349R-1440C=909L)
6 days SUS (7.00) ENG (41R-41C=0L)
The CDHF has upgraded the FORTRAN compiler from v6.3 to v6.5 on CDHF2 and
CDHF5.
CDHF pending software upgrades: IDL 5.1, OpenIngres.
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FOT
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REPORTING PERIOD
This report covers 29 August 1998 (Orbit 38056, GMT Day 241) through 04
September 1998 (Orbit 38160, GMT Day 247).
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
HALOE 240/0037 38041 On
HRDI 242/0038 38071 On
A summary of Instrument operations supplied by the Mission Planning Group
for the month of August 1998 is contained in Appendix F, UARS Instrument
Operations Summary.
The beta angle ranged between the angles of 13.0 degrees to 39.0 degrees
for this report period. The beta angle is now decreasing toward a minimum
angle of 52.0 degrees on 11 September 1998 (DOY 254).
A series of SSPP gridded offset maneuvers requested by SUSIM operations
were performed on GMT days 241-246. This offsets utilized the 5 and 10
arcminute intervals, versus the 15 and 30 arcminute intervals.
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 0.9 to 1.3 degrees C. Additional battery performance data
for each battery on 28 August 1998 and 04 September 1998 are provided in
Appendix D.
The clock error ranged from 11.2 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.
% ALERTS = 00
% OUT-OF-LIMITS = 10
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 03
% HRDI 04
% HALOE 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 05
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 98/210 - 2287.496941
Transponder B: 98/211 - 2287.499161
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 98/246 show the observatory data loss to be
21 hours, 05 minutes, 01.524 seconds (an increase of 15.424 seconds since
last report period). This is a 0.0346 percent data loss which equals a
99.9654 percent data capture for the mission.
The increase of 15.424 seconds occurred on Day 240 and was due to a hit in
data plus insufficient overlap.
Testing of the operational pack version of Application Processor (AP)
software version 10.12 continued. The test goals for acceptance were
completed on 31 August and 01 September 1998 using the UARS simulator
(UTTS). Verbal approval was given to MSOCC to build operational packs.
First operational use of version 10.12 was on 04 September 1998 supporting
the 1524Z contact. Operations were nominal except that the Clock Delta
equation processor did not function. Troubleshooting led to a theory that
the database and software were incompatible. Plans to correct the database
next week are in place
The FOT made modifications to the OBCSTF resident POCC database on 04
September 1998. The purpose of the database modifications was to add two
additional Equation Processor records to allow for correct clock delta
calculations. The clock delta calculations were previously performed
using an FOT supplied constant value via the LIMDEF STOL procedure. Due to
a recent AP software update, the clock delta calculations are now being
performed differently, hence the need for the two additional database
records. The database (version 68) will be tested next week.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
FOT continues to improve a power profile for UARS based on the current
status of the Modular Power System.
YEAR 2000 OPERABILITY SUPPORT
UARS Test and Training Simulator (UTTS) No change to report.
User Planning System (UPS) - No change to report.
Multi Satellite Operations Control Center (MSOCC) - No change to report.
Command Management System (CMS) - The FOT attended the weekly CMS Year 2K
Testing status on 03 September. Topic of discussion was the general status
of the testing.
The FOT worked with CMS Year 2K Test Team Sidney Kirschner this week in a
continuing effort to make progress on the Year 2K test functions. Several
more FDF test files were received by the FOT this week, all of which were
processed on the back-up CMS system. The FOT and Mr. Kirschner were able
to successfully process the Star Interference file as well as the TDRS East
and TDRS West ephemeris files. Errors were received when processing the
UARS OBC ephemeris file because the file not containing enough data. In
addition, the Spacecraft Orbital Events file could not be processed because
there was no corresponding PSAT file, which is required by the CMS.
Finally, the CMS could not successfully process the predicted Spacecraft
Ephemeris file due to the apparent inability of the CMS to interpret the
rollover from year 1999 to 2000. Further testing is planned for next week.
Flight Dynamics Facility (FDF) - Year 2K planning aids have been generated.
OBC PMON FLIGHT SOFTWARE UPDATE
Flight Software - Complete.
Ground Support Software - Complete.
Verification Testing - Testing of the operational version of the pack
complete. On-line testing revealed a problem with the delta time
calculation. Problem under investigation.
IP NETWORK TESTING
Space Network (SN) - 512kbps tape recorder playback to TPF using the IP
data stream was successful on 31 August 1998 (Orbit 38127 245/1848 UTC).
TPF locked on the tape recorder dump when commanded by the FOT and the
playback appeared free of errors on the TPF data quality display. Nominal
errors at the end of the playback were noted which are also received during
a nominal NASCOM playback. The TPF analyst reported that the post event
processing was good. Test of the 32kbps non coherent high antenna using
the IP link was also successful. Realtime data was received with no poly
errors and commanding was nominal. 32kbps Bank dumps were commanded and
banks 0-15 were downlinked successfully. A test of the 1kbps data link
from the UARS OMNI antenna using the IP link was successfully performed in
Orbit 38139 (246/1443 UTC).
Testing with the NCC 98 system to support routine flight operations is
being planned.
Deep Space Network (DSN) and Ground Spaceflight Tracking and Data Network
(GSTDN) - Working with the DSN test lead for I/P testing to verify UARS
emergency backup sites.
UARS PROPULSION MODULE B/D THRUSTER LINE FILL
The B/D thruster refill effort continues. The Eaton Latch Valve test
report has been received. A copy of the report was provided to the UARS
FOT by Dennis Asata, GSFC Propulsion Branch, on 02 September 1998 for
review and comment.
UARS RE-ENGINEERING - TELEMETRY PROCESSING
Flight operations is providing support to the re-engineering effort to
process the UARS telemetry on the TOMS/EP control center computer system.
UARS COMMAND RE-HOST PHASE 1 DEMONSTRATION
Flight operations continues to support the update of the Lockheed Martin
SCS-21 control center system to support a phase 1 feasibility demonstration
SCS-21 testing continued this week. Testing with the SOC computer system
that emulates the NCC system was conducted. This test was not successful
in that error messages could not be translated and received blocks could
not be dumped at the SOC. However, FOT continued to test the command
portion of the SCS-21 software. Single ground commands continue to work
between the UTTS and SCS-21. Spacecraft loads were sent from SCS-21 to
UTTS and were blocked and received properly. However, there was a problem
with the transmission of the UARS Spacecraft ephemeris load. The
transmission of this load caused the UTTS OBC to crash on several attempts.
A bad load was suspected; therefore, another spacecraft ephemeris was
transferred, converted and loaded in the UTTS without problem. The bad
load was attributed to a problem with file transfer using FTP which
currently has no CRC check on transmission/receipt.
Testing with NCC 98 system was conducted on 01 and 03 September 1998. NCC
98 reported several problems with the GCMRUs such as missing message type,
ID, and class areas in the data portion of the block. These were corrected
and NCC 98 accepted our GCMRUs and gave good responses back to SCS-21.
SCS-21 received good disposition and acknowledgments from NCC 98. Good ODM
data was also received.
MEETINGS
FOT supported a UARS Battery telecon on 25 August 1998. The next telecon
has been scheduled for 22 September 1998 at 1:00 pm.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is scheduled for scheduled for 29
September 1998.
The United States Naval Observatory (USNO) issued a Time Service
announcement advising that the International Earth Rotation Service (IERS)
will retard UTC time by 1.0 second at the end of December 1998. This means
the addition of one leap second as the last second of 1998.
The next annular solar eclipse will occur on 16 February 1999 over the
Indian Ocean, Australia and the South Pacific Ocean.
PERSONNEL CHANGES
None
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 F, UARS Instrument Operations Summary
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 04 September 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
38041 240/0037 98-313 HALOE Power ON (with PB off)
38045 240/0820 98-315 HALOE Pulse Bus on
38052 240/1937 98-316 HRDI Htr Cycle to 100 amp min
38071 242/0038 98-317 HRDI Power ON
38072 242/0223 98-318 HRDI Survival HTR On
38073 242/0453 98-319 HRDI Power ON
38074 242/0626 98-320 OBC Clk Adj fr 0.00 to 20.6 msec/day
38092 243/1144 98-321 OBC Clk Adj fr 20.6 to 0.00
38136 246/1021 98-323 OBC Clk Adj fr 0.00 to 20.6
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 04 September 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
WIEUTEMP Y-LO WINDII EU Temperature 38056-38160
HAH28VA R-LO HALO28V HTRMTR 38041-45
QTSISAIF Y-HI SSPP Baseplate by SISA I/F 38052-4,68
OBSVLBEON Y-LO Load Bus Volts at EON 38072
OBSBATVEON2 Y-LO Battery 2 voltage at EON 38072
OBSBATVEON3 Y-LO Battery 3 voltage at EON 38072
HRPSEQBIMON Y-HI HRDI Pulse Bus Cur. Mon 38074
HRPTSPBIMON Y-HI HRDI PTS Pulse Bus I Mon 38103
SOSNTGRSBTM R-HI SOLSTICE Integration 38107
HRIFESURVTMP Y-HI HRDI IFE Survival Htr Temp 38073
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None this report period
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 04 September 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
38074 242/06:46 (30 Aug 98) from 00.0 to 20.6 msec/day
38092 243/11:50 (31 Aug 98) from 20.6 to 00.0 msec/day
38136 246/10:30 (03 Sep 98) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 04 September 1998
28 Aug 1998 - GMT Day 240 Beta = 13.0 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/-4.31 +0.0/ +0.0 18.1 0.000 0.0
2 +89.6/ 0.0 +7.09/+4.51 +31.2/-15.2 24.2 1.020 23.1
3 +78.4/ 0.0 +5.79/+3.55 +30.4/-16.0 24.2 1.020 22.6
04 Sep 1998 - GMT Day 247 Beta = 39.0 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 -2.42/-3.68 +0.0/ +0.0 18.1 0.000 0.0
2 +39.2/-5.6 +6.44/+5.15 +28.8/-16.0 25.1 1.023 22.3
3 +44.8/-11.2 +5.47/+3.87 +28.4/-16.0 25.1 1.026 21.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes (V/T 5)
APPENDIX E
UARS ANOMALY REPORTS
Week ending 04 September 1998
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-054 FOT 38045 240/0820 N/A AP Crashed,ODN down
98-056 FOT 38111 244/1808 N/A 3 errs on S/C ephem dump
98-057 FOT 38151 247/0945 14170 Generic Late Acquisition
98-057 FOT 38155 247/1646 14170 Generic Late Acquisition
98-058 FOT N/A 247/2100 N/A CMS Load Transfer Problem
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-045 FOT AUG 98 SEE LIST 14170 GENERIC LATE ACQ.
98-052 FOT DAY 234 GRD LOAD TRANSFER
98-055 FOT 38072 242/02:23 TMON 1 TRIP
98-056 FOT 38111 244/18:08 GRD MASK ERRORS
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-057 FOT SEPT 98 SEE LIST 14170 GENERIC LATE ACQ
_______________________________________________________________
APPENDIX F
UARS INSTRUMENT OPERATIONS SUMMARY
Week ending 04 September 1998
INSTRUMENT SUMMARY FOR MONTH OF August 1998 (hours)
UNPLANNED UNSCHEDULED
ON OFF OFF OFF
(Insufficient (Other than
Instrument (Actual) (Scheduled) Power) Power Problem) COMMENTS
---------- ------ ----------- ----------- ------------- ------------
ACRIM 744 0 0 0
HALOE 300 434 10 0
HRDI 185 554 5 0
MLS 286 458 0 0
PEM (axis) 165 579 0 0
PEM (zeps) 22 722 0 0
PEM (neps) 0 744 0 0
SOLSTICE 744 0 0 0
SUSIM 744 0 0 0
WINDII 235 509 0 0
Cold side of spacecraft was facing northward: 06.5 days
Cold side of spacecraft was facing southward: 24.5 days