The ATSR Project
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ATSR DATA AVAILABILITY AND STATUS SUMMARY TO 13th March 2000
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John Wright (ATSR Operations Manager)
Rutherford Appleton Laboratory
UK +(0)1235-445809
Email: john.wright@rutherford.ac.uk
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 UTC
PSM 2 selected between 16:12:41 to 17:51:04 UTC
PSM 3 selected between 17:51:05 to 19:28:48 UTC
ATSR IRR science data should NOT be used during the
period 14:37:24 to 19:28:48 UTC.
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 UTC
Disp. ph. = 104.625 between 14:39:32 to 16:18:11 UTC
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 UTC
Disp. amp. = 0.93v between 13:27:32 to 16:43:16 UTC
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 UTC 16 Dec and
09:08:35 UTC 17 Dec
Comp. amp. = 2.23v between 09:08:36 UTC 17 Dec and
11:19:57 UTC 19 Dec
SCC set point = 90K between 10:18:11 UTC 16 Dec and
11:19:57 UTC 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 UTC 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 UTC 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 UTC on 10 Aug to 12:13 UTC 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 UTC 13 Aug and 14:13 UTC 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 UTC 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 17:26 to 20:42 UTC and 20:46 to 23:45 UTC
Another parity error caused payload to enter standby
at 20:37 UTC on 5 September. ATSR MWR restored to normal
operations by 09:25 UTC on 6 September. ATSR IRR reached
normal operating temperature at 14:30 UTC 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 UTC 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.
15 Sep 95 Cooler operating parameters adjusted.
258:09:38:15 UTC SCC Comp. Amp. from 2.210v to 2.235v (AE to B0)
19 Oct 95 Cooler operating parameters adjusted.
292:15:07:39 UTC SCC Comp. Amp. from 2.235v to 2.260v (B0 to B2)
19 Oct 95 Due to spurious BOT detection, LBR data was lost between
292:15:35:40 and 292:15:50:31 UTC
29 Oct 95 Due to spurious BOT detection, LBR data was lost between
302:06:35:22 and 302:06:37:51 UTC
14 Nov 95 Cooler operating parameters adjusted.
318:11:34:40 UTC SCC Comp. Amp. from 2.260v to 2.286v (B2 to B4)
04 Dec 95 Cooler operating parameters adjusted.
338:11:02:45 UTC SCC Comp. Amp. from 2.286v to 2.311v (B4 to B6)
10 Jan 96 Cooler operating parameters adjusted.
010:09:59:26 UTC SCC Comp. Amp. from 2.311v to 2.235v (B6 to B0)
The cooler has been deliberately backed off in order to extend
its lifetime having run for the last two months at higher
compressor amplitudes than qualified for. The detector temperatures
have continued to rise (currently 107-108 K). It is expected that
auto gain/offset control of the 12um channel will be lost with the
further increase in detector temperature expected after this cooler
setting change.
12 Jan 96 Following the SCC changes on 10th Jan. the detector temperatures
rose by approx. 3 degs. The auto gain/offset control on the 12um
channel was lost shortly afterwards. Today at 012:14:00:00 UTC
the 12um channel auto gain/offset control was deselected and a
fixed gain of 42 and offset of 0.483v commanded. The pixel
compression was changed to "10bit for 11/12um" from "12bit for 11um
and 8bit for 11 to 12 difference".
08 Feb 96 The 11um auto gain/offset control was lost from 039:07:48:36 UTC
through 039:12:25:00 UTC. 11um data through this period will be
unusable. Lock was re-acquired autonomously by increasing the
the cooler amplitude from B0 to B4 Hex for one orbit. This
briefly gave an additional 1-2 deg.K cooling on the detectors.
The instrument resumed normal running as set up on 12 Jan.'96
21 Feb 96 Due to an on-board anomaly (spurious BOT detection) low bit rate
data was lost between 052:09:57:29 and 052:10:19:05 UTC.
02 Apr 96 The 11um auto gain/offset control was lost from 093:05:54:02 UTC
through 093:15:03:00 UTC. 11um data through this period will be
unusable. Lock was re-acquired autonomously by increasing the
the cooler amplitude from B0 to B4 Hex for several orbits. This
gave an additional 1-2 deg.K cooling on the detectors.
At this time the 12um fixed gain and offset was optimised with
the gain set to 47 and offset to 0.537v.
28 Apr 96 At about this time the AMI routine mode of operation on ERS-1 was
changed (from Wind/Wave around the orbit to Wind only) this resulted
in an approx drop of 5 degC of the structure around the AMI. A small
but noticeable beneficial effect was noted on the IRR detector temps.
05 May 96 Due to an on-board anomaly (spurious BOT detection) low bit rate
data was lost between 126:10:32:18 and 126:10:47:42 UTC.
08 May 96 Cooler operating parameters adjusted.
129:09:30:nn UTC SCC Comp. Amp. from 2.235v to 2.260v (B0 to B2)
02 Jun 96 In preparation for the planned hibernation of the ERS-1 payload
the ATSR-1 IRR SCC compressor and displacer amplitudes were commanded
to zero allowing the detectors to warm up. This began at 154:09:40 UTC
which effectively marked the end of science data gathering.
03 Jun 96 The IRR was placed in STBY mode and hibernation began 155:07:30 UTC.
09 Jul 96 ATSR brought out of STBY and cool-down commenced in preparation for
upcoming Mutsu Bay (MUBEX-96) Campaign.
11 Jul 96 X-Band data downlink from ERS-1 during Kiruna pass 17:18:25 UTC thru'
17:30:06 UTC. From this data instrument performance was evaluated
in readiness for the Campaign.
15 Jul 96 A second realtime X-Band dump was taken from 16:53:13 UTC thru'
17:04:39 UTC to confirm the ATSR-1 setup. After processing the
instrument was declared ready to support MUBEX-96.
26 Jul 96 The first of a planned eight whole orbit X-Band tape dumps for the
MUBEX-96 Campaign from approx. 11:16 thru' 14:38 UTC. The pass
over Japan took place at 12:40:20 UTC. The total data period actually
covers nearly two orbits.
29 Jul 96 The second and third of the planned eight X-Band tape dumps for the
MUBEX-96 Campaign were acquired at 01:12 thru' 01:48 UTC and 11:16
thru' 13:12 UTC The passes over Japan took place at 211:01:28:58 UTC
and 211:12:46:05 UTC respectively.
01 Aug 96 The fourth of a planned eight X-Band tape dumps for the MUBEX-96
Campaign from approx. 01:15 thru' 01:55 UTC. The pass over Japan
took place at 214:01:34:43 UTC.
04 Aug 96 The fifth of a planned eight X-Band tape dumps for the MUBEX-96
Campaign from approx. 01:25 thru' 01:55 UTC. The pass over Japan
took place at 217:01:40:28 UTC.
07 Aug 96 The sixth of a planned eight X-Band tape dumps for the MUBEX-96
Campaign from approx. 01:30 thru' 02:00 UTC. The pass over Japan
took place at 220:01:46:13 UTC.
08 Aug 96 The seventh of a planned eight X-Band tape dumps for the MUBEX-96
Campaign from approx. 12:15 thru' 13:00 UTC. The pass over Japan
took place at 221:12:31:43 UTC. This was the last pass supported
in the campaign.
09 Aug 96 In preparation for the continued hibernation of the ATSR-1 IRR the
SCC compressor and displacer amplitudes were commanded to zero
allowing the detectors to warm up. This began at 222:08:55 UTC,
the auto gain/offset loops were later disabled, the black body
system was left in its normal configuration and the instrument
in NOMINAL mode which should enable minimum time and commanding
to bring the ATSR back into operation at the next re-activation.
16 Oct 96 ERS-1 payload shut-down whilst ESOC perform spacecraft onboard
computer maintenance. Three day reactivation of whole s/c
being planned for 22nd, 23rd and 24th Oct.
18 Oct 96 DEU powered up and then inadvertently shut down again by payload
EQSOL.
19 Oct 96 DEU finally reconfigured in readiness for the planned payload
reactivation.
21 Oct 96 ESOC begin detector cool down, instrument ready to collect
science data when IDHT data gathering begins at midnight
21/22nd.
22 Oct 96 After observing the first EGH data it was clear that with the
12um channel auto gain/offset loop was dropping lock during
the 'hottest' part of the orbit. In order to overcome this
the SCC cooler amplitude was increased from B2 to B6, this
gave sufficient extra detector cooling to keep the loop
locked throughout the whole orbit.
24 Oct 96 X-Band (IDHT) data ended at approx 23:00 UTC at the end of
the activation period.
25 Oct 96 ATSR-1 was hibernated again with the cooler amplitudes set
to zero and the scan mirror stopped, auto gain/offset loops
were deselected to avoid generation of IRRAD offscale
anomalies in the history reports. (08:40 UTC approx)
30 Dec 96 ESOC begin ATSR de-hibernation and start detector cool-down
SCC cold tip down to approx. 103K by 20:30 UTC. IDHT data
gathering should start on 31-Dec-96.
31 Dec 96 Instrument operates nominally with 11/12um auto gain/offset
loops enabled. At approx 23:30 UTC the 12um gain/offset dropped
lock once for about 20 mins during the "hottest" part of the
orbit.
02 Jan 97 12um auto gain/offset loop losing lock on most orbits just
during the hottest part of the orbit otherwise nominal.
03 Jan 97 Instrument hibernated again with cooler amplitudes set to zero
and scan mirror stopped. In all 43 orbits of IDHT data were
collected, all of which have useful IRR data.
10 Mar 97 ESOC begin ATSR de-hibernation and start detector cool-down
SCC cold tip down to approx. 101K by 19:00 UTC. IDHT data
gathering should start on 11-Mar-97 around 071:00:00:00 UTC.
11 Mar 97 ERS-1 planned reactivation of IDHT commenced, during the next
43 orbits ATSR-1 was was fully operational with both the 11 and
12um channel auto gain/offset loops enabled.
14 Mar 97 Instrument hibernated at approx. 03:00 UTC with cooler amplitudes
set to zero and scan mirror stopped. In all 43 orbits of IDHT
data were collected, all of which have useful IRR data
19 Mar 97 ERS-1 payload shutdown to STBY caused by PF anomaly.
20 Mar 97 ATSR back in pseudo-hibernation.
19 May 97 ERS-1 planned reactivation of IDHT commenced, during the next
43 orbits ATSR-1 was was fully operational with both the 11 and
12um channel auto gain/offset loops enabled.
23 May 97 Instrument hibernated at approx. 03:00 UTC with cooler amplitudes
set to zero and scan mirror stopped. In all 43 orbits of IDHT
data were collected, all of which have useful IRR data
28 Jul 97 ERS-1 planned reactivation of IDHT commenced, during the next
43 orbits ATSR-1 was was fully operational with both the 11 and
12um channel auto gain/offset loops enabled. During this reactivation
campaigns in Australia (Great Barrier Reef) and Mutsu Bay, Japan
were supported.
01 Aug 97 Instrument hibernated at approx. 08:00 UTC with cooler amplitudes
set to zero and scan mirror stopped. In all 45 orbits of IDHT
data were collected, all of which have useful IRR data
06 Oct 97 ERS-1 planned reactivation of IDHT commenced, during the next
45 orbits ATSR-1 was was fully operational with both the 11 and
12um channel auto gain/offset loops enabled.
10 Oct 97 Instrument hibernated at approx. 03:00 UTC with cooler amplitudes
set to zero and scan mirror stopped. In all 45 orbits of IDHT
data were collected, all of which have useful IRR data
15 Dec 97 ERS-1 planned reactivation of IDHT commenced. The instrument
detectors were cooled and the instrument in nominal when IDHT
operations commenced at approx. 23:50 UTC
17 Dec 97 S-Band data received today shows the 12uM channel gain/offset loop
loosing lock at the warmest part of the orbit. The 12um was therefore
commanded at approx 11:10 UTC to a fixed gain of 38 and offset of
0.46v for the rest of the reactivation.
18 Dec 97 Before the instrument could be hibernated an anomaly on the platform
caused a payload shut down this happened at approx. 13:27 UTC. The
instrument was left off whilst investigation of the problem was made.
Approximately 35 orbits of data will have been gathered.
30 Dec 97 ERS-1 spacecraft emergency declared when 40% of the solar array output
was lost. Future payload operations will be limited.
28 Apr 99 Dehibernation of ATSR begins at 09:30 UTC, cool down took approximately
12 hours with the 12uM channel auto gain/offset loop failing to lock.
29 Apr 99 IDHT data was collected from 05:45 UTC through 20:25 UTC.
The cooler compressor amplitude was increased to 2.311v at 15:20 UTC to
improve the chance of 12uM auto gain/offset loop lock, lock had still
not been achieved by 20:25 UTC when the instrument was powered down.
Detector temperatures were around 101K.
24 Jan 00 Dedicated ATSR/IRR payload dehibernation and checkout began at approx.
09:30 UTC the SCC compressor amplitude being set at 2.311v, due to power
constraints only realtime S-Band data was available during the instrument
set up.
25 Jan 00 IDHT data storage commenced at 06:35 UTC and continued through 21:50 UTC,
eight full orbits of science data were collected. Despite the cold-tip
temperature reaching a low of 97.6K, the 12uM auto gain/offset loop still
failed to lock, a fixed gain/offset of 36/0.45v was commanded at 11:45 UTC
in the 12uM channel together with a data compression change to 10 bit for the
11/12uM channels. A second change of gain/offset to 26/0.4v was commanded at
16:40 UTC in an attempt to optimise performance.
With the IRR the only instrument powered during this payload reactivation, it
was evident that 2 to 3 degree cooler detector temperatures could be achieved
for the nominal SSC settings.
10 Mar 00 ERS-1 platform suffered a number of anomalies resulting in a transition to SAFE
mode. Contact was lost with the spacecraft.
13 Mar 00 ESA announce ERS-1 Nine-year success story comes to an end.
Page last modified : Thursday, 06-Dec-07