********************************************************************
UARS WEEKLY STATUS REPORT - 21 August 1998
********************************************************************
***********
SOLSTICE
***********
SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.
***********
SUSIM
***********
SUSIM has successfully gathered its normal solar, offset, and occulation
data during this past week.
***********
PEM
***********
The PEM AXIS was active from August 9 through August 15. During this
period of time, PEM generated energy deposition profiles for each of its 16
pixels from electrons which had been inferred from measured X-ray spectra.
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.
***********
HALOE
***********
HALOE continues successful operations with all engineering parameters
within their expected operating region. HALOE was powered off today August
21, 1998 in preparation for the upcoming yaw maneuver.
***********
MLS
***********
The instrument is now off as scheduled.
***********
HRDI
***********
HRDI completed an on period at the end of August 18th. Operations were
normal. Next scheduled turn-on is August 30.
***********
WINDII
***********
Nothing received.
***********
MPG
***********
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.
One personnel change: Robin Gordon has resigned to take a position
with another company. She has worked in the Mission Planning Group
since March and will be missed here.
***********
CDHF
***********
The CDHF is preparing for the upgrade of the current FORTRAN compiler,
version 6.3, to version 6.5. A statement of impact has been
has been sent to the user community.
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.
117 days HAL (4.80) PROD (L1) (1873R-1137C-21F=715L)
22 days HAL (4.80) PROD (L3) (1873R-670C=1203L)
114 days SOL (4.62) PROD (L2-L3) (2349R-1167C=1182L)
2 days CLA (7.00) ENG (L1-L3) (2R-2C=0L)
The CDHF has loaded June 1998 DAAC data.
CDHF pending software upgrades: IDL 5.1, OpenIngres, Fortran V6.5
***********
FOT
***********
REPORTING PERIOD
This report covers 08 August 1998 (Orbit 37741, GMT Day 220) through 14
August 1998 (Orbit 37845, GMT Day 226).
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
WINDII 220/0305 37743 On
PEM 221/0309 37758 AXIS On
MLS 221/1932 37768 Stop Scan
MLS 224/2206 37814 Off
WINDII 224/2330 37815 Off
HRDI 224/2330 37815 On
HALOE 225/0103 37816 On
The beta angle ranged between the angles of 71.5 degrees to 46.4 degrees
for this report period. The beta angle is now decreasing toward a minimum
angle of 0.0 degrees on 25 August 1998 (DOY 237).
An additional SSPP SOLSTICE Offset sequence was performed this week on GMT
day 225 at the request of SUSIM operations (and with the agreement of
SOLSTICE operations). The offsets were identical to the regular SSPP
SOLSTICE Offset sequence, which is nominally scheduled once per week.
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 07 August 1998 and 14 August 1998 are provided in
Appendix D.
The clock error ranged from 12.5 to -12.8 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.
% ALERTS = 00
% OUT-OF-LIMITS = 01
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 05
% HRDI 01
% HALOE 01
% MLS 02
% PEM 01
% WINDII 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 01
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
One (1) 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 98/225 show the observatory data loss to be
20 hours, 46 minutes, 10.548 seconds (an increase of 20.192 seconds since
last report period). This is a 0.0344 percent data loss which equals a
99.9656 percent data capture for the mission.
The increase of 20.192 seconds occurred over three days:
7 0.224 seconds on Day 219 due to line errors,
7 19.808 seconds on Day 222 due to insufficient overlap, and
7 0.160 seconds on Day 223 due to line errors.
Applications Processor (AP) ground system software testing has been
suspended waiting release of an operational pack containing version 10.11.
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.
An FOT Standard Operating Procedure is being developed outlining how to
restore files to the CMS from the incremental or full back-up tapes. The
SOP is still under review, and should be completed sometime next week.
Flight operations is investigating an alternate to sun pointing safe hold
which can provide better protection for a two battery power subsystem. The
FOT is also attempting to define a one battery scenario which would save
the spacecraft and allow a single instrument to operate or the SSPP
instruments to operate with all other instruments completely OFF.
YEAR 2000 OPERABILITY SUPPORT
UARS Test and Training Simulator (UTTS) - has been analyzed and determined
to be 2000 compatible.
User Planning System (UPS) - The UPS software will be year 2000 compatible
with Release 11 Build 3 scheduled for development in September 1998 (The
Integrator, June 1998).
Multi Satellite Operations Control Center (MSOCC) - A list of the various
input and output products/interfaces to the Application Processor (AP) was
compiled (UARS Memo 98-018) at the request of Joanne Myers of the UARS Year
2K POCC Test Team.
Command Management System (CMS) - FOT met with CMS Year 2K Test Team
representative, Sidney Kirschner, to further discuss issues related to Year
2K CMS testing. These issues included the details of the Year 2K test
plan, the status of FDF planning aids required for testing, the input and
output files related to the various CMS processing steps, and the CMS
current directory structure used by the FOT for operations.
FOT worked with CMS Year 2K Test Team representative Daya Srivastava this
week in an effort to configure the back-up CMS system for testing. The FOT
provided an outline of the current operational CMS directory structure,
which was in turn duplicated on the back-up system. In addition, the FOT
began copying necessary support files from the prime CMS to the back-up
system so that testing on UCMSB could be initiated. After copying about 30
files (a very small percentage of the total files needed), "disk quota
exceeded" errors were received during the copy process indicating a limited
amount of disk space is assigned to the test account on UCMSB. A message
was left for the CMS system managers requesting an expansion of account
quota but no response has been received to date.
Flight Dynamics Facility (FDF) - The FOT and Test Team have both requested
test planning aids from FDF, but no products have been delivered. These
products are essential to testing the CMS software.
OBC PMON FLIGHT SOFTWARE UPDATE
Flight Software - The Flight Software is complete.
Ground Support Software - Complete. The Applications Processor operational
disk pack is being generated.
Verification Testing - Testing of the operations pack compilation of the
software will be required prior to uplink.
IP NETWORK TESTING
Space Network (SN) - Performed the I/P Net test live to UARS for realtime
telemetry on the I channel (32kbps) and Q channel (32kbps). The UARS POCC
received 32kbps I channel data successfully throughout two scheduled events
- 225/17:14 to 225/17:29 TDE/SSA1 and 225/19:50 to 225/19:58 TDW/SSA2.
The POCC attempted realtime spacecraft commands on both supports in order
to configure for 32 kbps OBC dumps, but was unsuccessful on both events.
The commands were leaving Multi-Sat but were not getting to the I/P
network. The CD Manager did not see UARS commands and reported that no
clock data was observed over the I/P command line - MS 440. The CD Mgr.
speculated that the problem was a misconfigured PTP which resides in Multi-
Sat. The NASA MSOCC System Engineer (Tom Marsh) investigated the problem
and reported that the PTPUs were configured correctly. The CD Manager then
rebooted their conversion device but it did not solve the problem. TTR #
20143 was opened to cover the anomaly and the problem is currently under
investigation.
NCC testing with the I/P link remains on hold until the MSOCC line
configuration problem can be resolved. Additional testing with the
spacecraft will be scheduled after NCC test completion.
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.
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.
FOT supported a review on 14 August 1998 to discuss the software for the
equation processors. All equation processors defined in the SORD and the
AP SUG were covered.
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. The test script for the UARS re-hosting was completed this
week and a copy will be distributed for review.
The SCS-21 equipment was shipped on 14 August 1998 and is expected to
arrive at the UARS Mission Operations area on 17 August.
SCS-21 requested several blocks of NCC 98 simulation time for testing
starting on 8/21/98 and extending through 8/28/98. NCC 98 availability may
be limited.
MEETINGS
The FOT attended a weekly CMS Year 2K status meeting (hosted by Carey
Myers) on 13 August 1998. Topics of discussion at the meeting were the
current status of the FDF planning aids spanning the three test intervals
and the status of the backup CMS system.
No UARS Battery telecon was held this week. The next telecon has been
scheduled for 25 August 1998 at 1:00 pm.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is scheduled for scheduled for 25 August
1998.
PERSONNEL CHANGES
None
Attachments: Appendix A, Real-time Commands Sheets
Appendix B, Clock & Solar Array Rate Corrections
Appendix D, UARS Battery Performance Data
Appendix E, UARS Anomaly Reports
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 14 August 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
37743 220/0305 98-286 WINDII Power ON
37758 221/0309 98-287 PEM Power On AXIS
37763 221/1105 98-288 OBC Clk Adj fr 20.6 to 0.00 msec/day
37765 221/1431 98-289 OBC Clk Adj fr 0.00 to 41.2 msec/day
37768 221/1932 98-290 MLS MLS STOP / SCAN OFF
37783 222/1944 98-291 OBC Clk Adj fr 41.2 to 20.6 msec/day
37791 223/0927 98-292 OBC Clk Adj fr 20.6 to 0.00 msec/day
37813 224/1956 98-293 OBC Clk Adj fr 0.00 to 20.6 msec/day
37814 224/2206 98-294 MLS Power OFF
37815 224/2330 98-295 WINDII Power OFF
37815 224/2330 98-296 HRDI Power ON
37816 225/0103 98-297 HALOE Power ON
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 14 August 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
MLSCANACTTMP Y-HI SCAN ACTUATOR TEMP 37768
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None this report period
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 14 August 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
37763 221/11:11 (09 Aug 98) from 20.6 to 00.0 msec/day
37765 221/13:01 (09 Aug 98) from 00.0 to 41.2 msec/day
37783 222/19:52 (10 Aug 98) from 41.2 to 20.6 msec/day
37791 223/09:33 (11 Aug 98) from 20.6 to 00.0 msec/day
37813 224/20:00 (12 Aug 98) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 14 August 1998
07 Aug 1998 - GMT Day 219 Beta = 71.5 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 18.1 0.000 0.0
2 +11.2/ -33.6 +3.87/+1.97 +19.2/-16.0 26.7 1.034 16.8
3 +22.4/ -22.4 +2.60/+1.03 +18.4/-15.2 26.6 1.031 16.3
14 Aug 1998 - GMT Day 226 Beta = 46.4 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 18.1 0.000 0.0
2 +22.4/-22.4 +6.11/+4.51 +28.4/-16.0 25.1 1.024 21.6
3 +33.6/-16.8 +5.15/+3.23 +27.2/-16.0 25.0 1.026 21.1
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes (V/T 5)
APPENDIX E
UARS ANOMALY REPORTS
Week ending 14 August 1998
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-046 FOT 37742 220/0116 20129 Telemetry Dropout
98-045 FOT 37763 221/1105 14170 Generic Late Acquisition
98-045 FOT 37765 221/1431 14170 Generic Late Acquisition
98-045 FOT 37784 222/2123 14170 Generic Late Acquisition
98-045 FOT 37788 223/0416 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
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
------ ------ ----- ---- --- -----------------
98-045 FOT See list Aug 1998 14170 Generic Late Acquisition