ATSR DATA AVAILABILITY AND STATUS SUMMARY TO 27th August 1995 ------------------------------------------------------------- John Wright (ATSR Operations Manager) Rutherford Appleton Laboratory UK +(0)1235-445809 Email: john.wright@rutherford.ac.uk This file can be displayed from SADIST account by the command $TYPE/PAGE atsr$info:atsr_stat.txt The following is a brief summary of period when ATSR data was not available or should be handled with care. The summary is for the period between launch of ERS-1 to date. At all other time ATSR was nominal. The normal configuration for ATSR was that 12.0 and 11.0 channels are always packed into the telemetry stream, while the 3.7 is packed during night-time and 1.6 during day-time. This remained in effect until the 3.7um channel failed on 27 May 1992, after which time the 1.6um channel was always packed. DATE STATUS ---- ------ 16 July to ATSR undergoing commissioning activities. All ATSR 14 Sept 91 science data in this period should be handled with care. For details of ATSR configuration during this period refer to ATSR Commissioning Status note. 31 Jul 91 Commissioning Phase orbit (3 day repeat cycle) began 8 Oct 91 None nominal pixel selection map selected ATSR IRR:- PSM 1 selected between 14.37.24 to 16.12.40 PSM 2 selected between 16.12.41 to 17.51.04 PSM 3 selected between 17.51.05 to 19.28.48 ATSR IRR science data should NOT be used during the period 14.37.24 to 19.28.48. 21-23 Nov 91 Planned Outgassing Procedure began at :- 325:11:50 UTC with SCC Comp Amplitudes and Displacer Amplitudes commanded to zero. The detectors began their warm-up. The Outgassing (warm-up and subsequent cool-down) was completed at 327:01:00 UTC. During this period (MWR remained nominal). 25 Nov 91 ATSR cooler operations test with modified displacer phase:- Disp. ph. = 95.625 between 12.59.32 to 14.39.31 Disp. ph. = 104.625 between 14.39.32 to 16.18.11 This test has NO effect on quality of ATSR IRR or MWR science data. 9 Dec 91 ATSR cooler operations test with modified displacer amplitude:- Disp. amp. = 0.92v between 10.08.52 to 13.27.31 Disp. amp. = 0.93v between 13.27.32 to 16.43.16 This test has NO effect on quality of ATSR IRR or MWR science data. 10 - 26 Dec 91 ERS-1 performing orbit manoeuvres to change from Commission Phase (3 day) to Ice Phase (3 day) orbit and perform SAR Roll mode data. ATSR cooler set to use optimized displacer amplitude Disp. amp. = 0.93v on 11 Dec. ATSR cooler operations test with modified compressor amplitude:- Comp. amp. = 2.13v between 09:41:50 16 Dec and 09:08:35 17 Dec Comp. amp. = 2.23v between 09:08:36 17 Dec and 11:19:57 19 Dec SCC set point = 90K between 10:18:11 16 Dec and 11:19:57 19 Dec This test has no effect on quality of ATSR IRR or MWR science data. 19 to 23 Dec ATSR was outgassing (decontamination) cycle between 353:11:30:00 UTC and 357:21:30:00 UTC During the rest of the ERS-1 orbit manoeuvre period ATSR remained in nominal, but ATSR IRR and MWR data should be handled with great care during this period. 3 Feb 92 ATSR IRR and MWR is stand-by due to ERS-1 activity. No IRR or MWR science data during the period. 034:07:30:00 UTC and 034:23:20:00 UTC 30 Mar to ERS-1 performing orbit manoeuvres to change from Ice 14 Apr 92 Phase (3 day) to Multidisciplinary Phase (35 day) orbit and perform SAR Roll mode data. 07-11 Apr Planned Outgassing Procedure began at :- 098:17:00 UTC with SCC Comp Amplitudes and Displacer Amplitudes commanded to zero. The detectors began their warm-up. The outgassing (warm-up and subsequent cool-down) was completed at 102:04:50 UTC. During the rest of the ERS-1 orbit manoeuvre period ATSR remained in nominal, but ATSR IRR and MWR data should be handled with great care during this period. 27 May 92 At 19:12 UTC ATSR IRR 3.7um channel failed. No ATSR 3.7um channel data from this time onward. 27 May to ATSR IRR 1.6um channel data not useable during this 04 Jun 92 period due to effects of 3.7um channel failure. 04 Jun to Investigation of ATSR 3.7um channel failure. During 16 Jun 92 this period ATSR was set into a variety of modes in order to determine the cause of the 3.7um channel failure. For further details of IRR & MWR science data availability during this period refer to note on 3.7um channel failure. 10 Jun to Outgassing performed during investigations between 16 Jun 92 331:13:40 UTC and 337:08:00 UTC After these activities cooler displacer amplitude left at default value of 0.909V. This resulted in 0.25K higher detector temperatures than normal until preferred value set on 8 July. 26 Jun to ATSR IRR and MWR in stand-by due to ERS-1 27 Jun 92 PDU anomaly. No IRR or MWR science data during this period. 8 July 92 Cooler displacer amplitude set to preferred value:- disp. amp. = 0.9V at xx.xx Detector temperatures reduced by 0.25K at result. 19 Jul to ATSR IRR and MWR in stand-by due to ERS-1 activities. 23 Jul 92 ATSR IRR and MWR commanded to stand-by at 9:19 on 19 July 92 when OBC detected 'bit flip' in ERS-1 None Vital Data Store. No IRR or MWR science data during this period. 9 - 10 Aug 92 ATSR IRR and MWR in stand-by due to ERS-1 activities. ATSR IRR and MWR commanded to stand-by at 10:40 UTC on 9 Aug 92 when OBC detected 'bit flip' in ERS-1 Vital Data Store. MWR returned to normal operations at 11:00 on 10 Aug. The IRR reached normal operating temperature at 21:00 UTC on 10 Aug. No IRR or MWR science data during this period. 10 - 12 Aug 92 ATSR Instrument Data Formatting (AIDF) monitoring enable. The AIDF monitoring had been disabled during commissioning. This test was performed to collect data for ATSR-2 project. Monitoring was enabled between 09:57 on 10 Aug to 12:13 on 12 Aug. This test has NO effect on quality of ATSR IRR or MWR science data. 13 - 14 Aug 92 ATSR cooler operations test with modified operating frequency:- Freq. = 43.353Hz between 15:01 13 Aug. and 14:13 14 Aug. This test has NO effect on quality of ATSR IRR or MWR science data. 25 - 26 Aug 92 ERS-1 Payload was switched down to standby at 12:43 UTC on 25 August due to a transient error. ATSR MWR restored to normal operations by 17:00 on 24 August. ATSR IRR reached normal operating temperature at 01:20 UTC on 26 August. No IRR or MWR science data during this period. 2 - 6 Sep 92 ERS-1 Payload was switched down to standby at 14:34 UTC on 2 September due to a VDS parity error. ATSR MWR restored to normal operations by 19:00 UTC on 3 September. During the payload recovery on 3 Sep the IDHT entered command refuse mode resulting in loss of payload data transmission between 17:26 to 20:42 and between 20:46 to 23:54. Another parity error caused payload to enter standby at 20:37 on 5 September. ATSR MWR restored to normal operations by 9:25 on 6 September. ATSR IRR reached normal operating temperature at 14:30 on 6 September. 8 Sep 92 ERS-1 suffered another VDS parity error on 8 September 1992. This occurred at 252:06:30.08 and resulted in the payload being commanded to STANDBY. ATSR MWR returned to NOMINAL at 252:09:48:35. ATSR IRR was turned on at 252:09:53:55 and cooldown to its operational temperature by 252:15:00 UTC. No IRR or MWR science data during this period. 07 Oct 92 IDHT was inoperative between 281:11:25:50 and 281:11:27:10 whilst Payload timing resynchronising took place. No IRR or MWR data during this period. 12/13 Nov 92 Due to ESOC operations IDHT and hence ATSR data were unavailable between 317:18:55:39 and 318:08:30:00 UTC. No IRR or MWR data during this period. Due to a procedural discrepancy, on reconfiguration the wrong compression mode was selected AND the 1.6/3.7 AUTOCAL was turned ON. 13-16/24 Nov 92 1.6 channel gain incorrectly being controlled by the (failed) 3.7 AUTOCAL, resulting in unstable 1.6 data. from 318:08:30:00 to 321:10:19:00 UTC. The correct compression mode was then reselected at the start of the planned outgassing which commenced at 329:12:46:00 UTC 17 Nov 92 New Nominal Settings for SCC. SCC Compressor Amplitude adjusted to A8 hex (2.1333v) and SCC Frequency to 2B hex (43.605 Hz) at :- 322:11:28:01 UTC and 322:11:28:52 UTC respectively. 24-26 Nov 92 Planned Outgassing Procedure began at :- 329:12:46:51 UTC with SCC Comp Amplitudes and Displacer Amplitudes commanded to zero. The detectors began their warm-up. The Outgassing (warm-up and subsequent cool-down) was completed at 331:18:24:07 UTC IRR science data is not available between :- 329:12:46:51 and 331:18:24:07 UTC. 12 Dec 92 Due to an unexpected tape recorder Beginning of Tape (BOT), the tape recording was stoped for low bit rate data between 347:22:12:27 and 347:22:59:40. No IRR or MWR science data during this period. 16 Dec 92 ERS-1 performed orbit correction manoeuvre. ERS-1 not in Yaw Steering Mode between 351:12:53:52 and 351:18:45:56. During this period it was not possible to maintain nominal pointing accuracy. For this reason, ERS-1 products during the period may not meet their specification. 23 Dec 92 A spurious BOT was detected in the recording period 358:00:34:59 to 358:02:12:13. resulting in loss of low bit rate data. No IRR or MWR data for the period 358:01:04:35 to 358:01:07:25 UTC. 25 Dec 92 As a result of recovery of AMI and need for two timing resyncronisations the IDHT was not supplying IRR or MWR data between :- 360:11:45:00 to 360:11:46:00 UTC and 360:13:21:00 to 360:13:22:00 UTC. 01 Feb 93 Due to public mains failure and problems with backup generator Kiruna were unable to track ERS-1 during the pass 032:13:12:55 thru' 032:13:21:34 UTC R/T and playback X-Band data not received. (at this time 02-Feb the strt/stop times of lost tape data are not clear ) 14 Feb 93 Data problems caused by a radiation hit (SEU ?). The ERS1 General Data header was corrupted which caused ground station processing problems. Data users who rely on "General Header" (Not ATSR at RAL) must beware between : - 045:15:22:00 to 048:14:??:?? UTC 09/11 Mar 93 ATSR and MWR were inadvertently switched to STANDBY after an AMI instrument recovery when resynchronising the payload. Recovery of the ATSR was postponed in order to take advantage of the shut down to "outgas" (this was being planned for 15th Mar 93 anyway). The complete decontamination period lasted from :- 068:17:38:56 to 070:19:59:29 UTC. ATSR data between these times will not be NOMINAL. 16 Mar 93 Default upper limit setting commanded for parameters F716, F717 SCC Comp. A/B current - new value 40 Hex for both. Limits 0.5547v (F716); 0.5518v (F717) converted 17 Mar 93 New Nominal Settings for SCC. SCC Compressor Amplitude adjusted to AB hex (2.171v) and SCC Frequency to 2A hex (43.859 Hz) at :- 076:11:59:38 UTC and 076:12:01:12 UTC respectively. 13 Apr 93 Due to ESOC operations the IDHT was unavailable between :- 103:11:22:30 UTC and 103:11:24:15 UTC 14 Apr 93 Due to ESOC operations the IDHT was unavailable between :- 104:20:39:14 UTC and 15 Apr 93 105:11:48:18 UTC 04 May 93 ERS-1 completed a scheduled Orbit Control Manoeuvre at 124:12:17:48 UTC. Between 11:44:48 and 17:36:54 UTC the spacecraft was in pre-operational Fine Pointing Mode, and scientific data may not be usable. 05 May 93 A Fine Control Orbit manoeuvre was performed between :- 125:04:17:47 UTC and 125:04:18:07 UTC ATSR image data may be affected. 17 Jun 93 Due to ESOC operations the IDHT was unavailable between :- 168:12:17:00 UTC and 168:12:18:30 UTC NB ATSR was resynchronised at 168:12:17:35 UTC 19 Jun 93 Due to an anomaly the IDHT was unavailable between :- 170:13:49:57 UTC and 170:14:14:20 UTC 21 Jun 93 Due to ESOC operations the IDHT was unavailable between :- 172:08:11:00 UTC and 172:09:56:44 UTC 29 Jun 93 Scheduled IRR outgassing took place between :- 180:09:09:12 UTC and 01 Jul 93 182:19:34:56 UTC ATSR data between these times is not be nominal. 09 Jul 93 Due to spurious BOT (onboard T/R) detection LBR data is missing between :- 190:11:02:30 UTC and 190:12:07:04 UTC 18 Aug 93 Due to a Platform anomaly the payload was switched to STBY at 230:09:38:09 UTC The opportunity was taken to outgass the ATSR. This operation was completed at :- 20 Aug 93 232:18:27:07 UTC Data between these times is not nominal. 13 Sep 93 Due to operational reasons no LBR data between :- 256:22:29:00 and 256:22:38:00 UTC 14 Sep 93 and again between :- 256:23:59:41 and 257:12:15:28 UTC. 02 Oct 93 Due to an operational anomaly payload switched to STBY at 275:12:45:38 UTC The opportunity was taken to outgass the ATSR. This operation was completed at :- 03 Oct 93 276:23:47:33 UTC Data between these times is not nominal. 18 Oct 93 Over the next four days some adjustments have been made to SCC operating paramaters. No science data has been lost but cooler paramter changes will have affected detector sensitivity. The adjustments have been made to characterise the SCC performance. 291:07:40:00 UTC SCC Freq. adjusted from 43.86 to 43.35 Hz 291:16:00:00 UTC SCC Freq. readjusted back to 43.86 Hz 19 Oct 93 292:07:10:00 UTC SCC Disp. Amp. from 0.93v to 0.91v (B3 to AF) 292:15:30:00 UTC SCC Disp. Amp. reset to 0.93v 20 Oct 93 293:08:20:00 UTC SCC Comp. Amp. from 2.171v to 2.13v (AB to A8) 293:14:58:00 UTC SCC Comp. Amp. from 2.13v to 2.108v (A8 to A6) 293:21:34:00 UTC SCC Comp. Amp. from 2.108v to 2.171v(A6 to AB) 21 Oct 93 294:12:47:00 UTC SCC Frequency adjusted to (28 hex) 44.37 Hz 22 Nov 93 326:07:40:00 UTC SCC Disp. Phase from 100.1 deg to 95.6 deg 326:15:55:00 UTC SCC Disp. Phase back to 100.1 deg (nominal) 02 Dec 93 336:09:05:40 UTC SCC Disp. Phase from 100.1 deg to 104.6 deg 336:17:20:47 UTC SCC Disp. Phase back to 100.1 deg 06 Dec 93 Due to an anomaly with the IDHT LBR data was lost between 340:03:21:56 UTC and 340:10:21:40 UTC 13 Dec 93 Whilst investigating a problem with an X-Band TWT the IDHT and ICU were powered off and on again, this caused the ATSR to go into STBY resulting in loss of data at :- 347:11:47:11 UTC. The IRR will be allowed to "warm-up" and outgass. 16 Dec 93 Outgassing complete and nominal data available again from :- 350:23:18:26 UTC 17 Dec 93 End of Multidisciplinary Phase (35 day repeat cycle) 20 Dec 93 354:12:59:41 UTC SCC Comp. Amp. set to AD (hex) 2.196v 21 Dec 93 Second Ice Phase (3 day repeat begins) 06 Jan 94 006:08:40:00 UTC SCC Disp. Phase changed from 100.1 deg to 97.87 22 Jan 94 During investigation of an RA anomaly ATSR was switched down to STBY between:- 022:16:24:13 UTC and 022:21:16:52 UTC. During this time the detectors warmed up, after the restart they reached nominal operating temps. the following day, 23rd Jan, by approx. 023:05:00 UTC 29 Jan 94 Due to inavailability of the IDHT there are no LBR data from :- 029:22:19:00 UTC and 30 Jan 94 030:13:34:10 UTC 07 Feb 94 Cooler operating parameters adjusted. 038:09:12:00 UTC SCC Comp. Amp. from 2.197v to 2.210v (AD to AE) 038:09:13:00 UTC SCC Frequency adjusted from 44.37 to 44.64 Hz. 18 Mar 94 Planned SCC Outgassing from :- 077:14:10:14 UTC Warm-up began 080:09:20:00 UTC Cool-down began 21 Mar 94 080:20:43:00 UTC the detectors had resumed nominal operating temps. 06 Apr 94 Cooler operating parameters adjusted. 096:07:02:30 UTC SCC Comp. Amp. from 2.210v to 2.235v (AE to B0) 10 Apr 94 End of Second Ice Phase (3 day repeat) Geodetic Phase (168 day repeat cycle) starts 14 May 94 Due to TR miscommanding LBR data was lost between :- 134:16:21:34 and 134:16:22:06 UTC 134:16:50:24 and 134:17:59:10 UTC 23 May 94 Cooler operating parameters adjusted. 144:09:03:03 UTC SCC Comp. Amp. from 2.235v to 2.222v (B0 to AF) 144:09:04:36 UTC SCC Frequency adjusted from 44.64 to 44.91 Hz. 15 Jun 94 Default upper limit setting commanded for parameters F716, F717 SCC Comp. A/B current - new value 3C Hex for both. Limits 0.517v (F716); 0.521v (F717) converted 16 Jun 94 SCC Compressor A and B Offsets set to 60 Hex (-0.448v) Approx 0.6 K improvement in detector temps seen. 17 Jun 94 SCC Compressor A and B Offsets reset to 70 Hex (-0.224v) after ~24 hours. 27 Jun 94 SCC Compressor A and B Offsets set back again to 60 Hex (-0.448v) and SCC Comp. Amp. set down one step to AE Hex (2.210v) 03 Aug 94 Cooler operating parameters adjusted. 215:14:07:05 UTC SCC Comp. Amp. from 2.210v to 2.235v (AE to B0) 215:14:07:27 UTC SCC Freq. adjusted from 44.91 to 45.18Hz. (25 to 26 Hex) 22 Aug 94 Due to spurious BOT on the IDHT LBR data lost from : 234:19.08:20 thru' 234:19:23:08 UTC 08 Sep 94 Due to an IDHT anomaly LBR data lost between :- 251:01:47:30 thru' 251:08:06:47 UTC 251:09:06:21 thru' 251:09:41:51 UTC and lastly 251:09:49:30 thru' 251:11:28:06 UTC 05 Oct 94 Due to an anomaly the ATSR DEU performed an autonomous shutdown, this occurred at 278:03:20:38 UTC. The present belief is that this was an SEU as ERS-1 was in the South Atlantic Anomaly region at this time. ATSR was left to outgass. During recovery the DEU was reset, Cool down began on Friday 7th Oct. with the following SCC settings Compressor Amplitude 2.171v (AB hex) Displacer Amplitude 0.93v (B3 hex) Compressor Frequency 44.37 Hz 08 Oct 94 ATSR resumed "Nominal" operation at : 281:12:09:51 UTC. The FPA was running at this time 2-3 deg. warmer than just prior to the shut down. Fine adjustments to the SCC were made over the next three days. The cooler amplitude will be kept at 2.210v (AE). 11 Oct 94 Cooler operating parameters adjusted. SCC Compressor A and B Offsets set to 60 Hex (-0.448v) at 284:10:25:11 UTC 12 Oct 94 Cooler operating parameters adjusted. Reset on board limit checking of TMZ716/717 285:13:01:51 UTC SCC Disp. Phase from 100.1 deg to 97.85 (27H) 285:13:01:51 UTC SCC Comp. Amp. from 2.171v to 2.210v (AB to AE) 13 Oct 94 Cooler operating parameters adjusted. 286:10:55:00 UTC SCC Freq. adjusted from 44.37 to 45.18Hz. (25H) 14 Nov 94 Due to problems with the IDHT no low bitrate data was available 318:06:18:40 UTC thru' 318:17:05:30 UTC 20 Nov 94 Due to a spurious BOT on the IDHT tape LBR was lost between:- 324:09:06:19 UTC and 324:10:09:19 UTC 16 Dec 94 Due to an anomaly the ATSR DEU performed an autonomous shutdown, this occurred at 350:00:01 UTC. At the time ERS-1 was in the process of moving from Yaw Steeering Mode to Fine Pointing Mode after a planned orbit manoeuvre. Inspection of Telemetry showed the shut down to have been initiated due to ATSR health indicator 0,1 and 3 timing out, failing and overunning respectively. ATSR ICU correctly issued an EQSOL request to the OBC and ATSR was shut down. Further inspection of telemetry showed excessive build up of F401 "Sub pixel position adjustment" events this had occurred over the preceding 72 hours - these events are commonly associated with Scan Mirror jitter. The instrument was left to outgass, as is now our standard procedure. 19/20 Dec 94 During the next two days the ATSR was recovered with particular attention being paid to the SMU performance. The scan mirror was run for approximately 20 hours before begining the cool down. Cool down commenced on 20th Dec at 09:35 UTC and NOMINAL status was achieved at 354:20:57:06 UTC with the SCC operating at pre-anomaly settings ( except for compressor amplitude at 2.21v AE HEX, two steps below the pre-anomaly setting) and detectors fully cooled down. Later telemetry indicated though that the autogain/offset loops had not settled down correctly until 21st Dec 355:01:30:00 UTC. Scan mirror "jitter" events cleared up to pre-anomaly rates at approx 20th Dec 354:17:00:00 UTC Data therefore should be usable again from 355:01:30 UTC. 24 Jan 95 Due to an onboard anomaly the IDHT was unavailable from :- 025:12:47:38 UTC thru 025:16:02:45 UTC No LBR data was collected during this period. 19 Mar 95 ERS-1 Manoeuvre to change from 168 to 35 day repeat began. The platform was in Fine Pointing Mode from approx 078:10:05:00 UTC through 078:16:50:00 UTC. Data processed for this period should be viewed with caution. 21 Mar 95 ERS-1 Manoeuvre finishes today. The platform is expected to be in Fine Pointing Mode again from :- 080:05:40:00 UTC through 080:13:45:00 UTC. Again data processed for this period should be viewed cautiously. 31 Mar 95 Black Body Cross Over Test begins to verify the accuracy of the emissivities and temperature measurement of the on-board calibration black bodies. Cross-over began at 090:07:35:57 UTC. The BB temperatures had stabilised by 090:20:47:56 UTC. Data between these times is not nominal. The black bodies will remain in crossed over roles for approx six days. 04 Apr 95 The heater power to the -XBB was changed from MEDIUM to HIGH at 094:13:49:49 UTC. This raised the temperature of the 'Hot' Black Body from 31 to 36 degrees C. 06 Apr 95 The reverse crossover test to bring the BB configuration back to normal began at 096:07:49:37 UTC. The BB temperatures had stabilised by 096:21:01:23 UTC. Data between these times is not nominal. The ATSR Black Body configuration is now back at the nominal settings as of 31 Mar 95 prior to 07:35 UTC. 08 Apr 95 Due to a spurious BOT on the IDHT tape LBR data was lost between 098:18:30:03 UTC and 098:18:41:28 UTC. 27 Aug 95 Due to an MPS error the IDHT LBR data was unavailable from day 239:01:02:00 UTC to 239:08:17:00 UTC. Ther will be no ATSR-1 data between these times. -----------------------------------------------------------------------------