Table listing all major events for the AATSR instrument during the Envisat mission lifetime: 01 March 2002 - 08 April 2012.

 

Year Date Time Orbit Event(s)
COMMISSIONING PHASE
2002 01-Mar     Launch from Kourou, French Guyana
06-Mar     First Platform data received at RAL, covering 4 days of operations.
09-Mar 09:25   AATSR was commanded into STANDBY mode from OFF for the first time since launch. The first data confirmed that the cooler was clamped as expected.
11:00   The cooler was un-clamped and AATSR was configured for in-flight operations.
10-Mar     STANDBY mode. No AATSR operations.
11-Mar     STANDBY mode. No AATSR operations.
12-Mar 17:45   AATSR commanded from STANDBY to HEATER mode.
13-Mar     AATSR in HEATER mode.
14-Mar     HEATER mode. No AATSR operations.
15-Mar 14:37   AATSR switched to MEASUREMENT mode. First instrument source packets generated.
16-Mar     MEASUREMENT mode. No AATSR operations.
24-Mar     AATSR in MEASUREMENT mode.
10:00   Visible channel gains updated following analysis of science data.
26-Mar 09:15   The instrument was restarted with the SCC cooling the FPA for the first time.
10:39   The scan mirror was restarted and the cooler set to maximum amplitudes.
14:07   The FPA reached 80K and AATSR automatically entered HEATER mode. The IR gains and offsets were being set by the auto-gain offset control loop.
15:43   AATSR was commanded back into measurement mode.
03-Apr 08:26   AATSR was commanded into HEATER mode with the cooler drives at zero amplitude and the scan mirror switched off in preparation for the ENVISAT orbit control manoeuvre.
09-Apr 08:34 00562 The scan mechanism was restarted, the auto-gain-offset loop re-enabled and AATSR was commanded back into MEASUREMENT mode.
15-Apr 11:59 00650 The instrument entered STANDBY/REFUSE mode due to the cooler body temperature dropping below the lower switchdown limit of -10C.
17-Apr 11:02 00678 AATSR commanding was re-enabled and cooler compressor and displacer amplitude initial settings commanded. Transition to HEATER mode could not be started because the Cooler Body Temperature remained below the switch-on condition of -8C and rising during passes.
18-Apr 17:37 00696 The HEATER mode command was executed and AATSR immediately returned to STANDBY/REFUSE mode. The immediate cause was a command echo failure.
19-Apr     An Anomaly Review Board was held to agree a recovery plan for AATSR and identify further investigations. Memory Dump of the RAM area was taken and the instrument returned to STANDBY mode.
17:03 00710 A further attempt to return to HEATER mode was made but resulted in AATSR immediately returning to STANDBY/REFUSE mode.
23-Apr     AATSR Recovery Procedure AATSR-IOR-0009
11:13 00764 AATSR ICU reset and returned to STANDBY mode
12:53 00765 Cooler initial amplitudes sent
15:00 00766 AATSR transition to HEATER mode started
16:11 00767 Cooler default amplitudes sent
19:33 00769 AATSR in HEATER mode
24-Apr     AATSR Recovery Procedure AATSR-IOR-0009
07:26 00776 Scan mirror started
07:27 00776 AATSR in MEASUREMENT mode
    Visible channel auto-offset loops not enabled and signal channels at hardware default gain settings
26-Apr     AATSR in MEASUREMENT mode
13:00 00808 Visible channel auto offset loop enabled and visible channel gains commanded
30-Apr     Part 1 of Blackbody Cross-over Test started -(S-D-P-3.5)
01-May     Part 2 of Blackbody Cross-over Test started -(S-D-P-3.5)
02-May     Blackbody Cross-over Test completed
    Blackbody temperatures stabilised and auto-gain/offset loop re-enabled
03-May     Scan Mirror Checkout S-D-P-3.3
12:41 00908 Snapshot-2 commanded to 2002
14:15 00909 Snapshot-2 commanded to 2003
15:52 00910 Snapshot-2 commanded to 2004
17:30 00911 Snapshot-2 commanded to 2001
04-May     Scan Mirror Checkout S-D-P-3.3
10:34 00921 Snapshot-2 commanded to 2002
12:05 00922 Snapshot-2 commanded to 2003
13:44 00923 Snapshot-2 commanded to 2004
15:23 00924 Snapshot-2 commanded to 2001
05-May     Scan Mirror Checkout S-D-P-3.3
08:15 00934 Snapshot-2 commanded to 2002
09:55 00935 Snapshot-2 commanded to 2003
11:34 00936 Snapshot-2 commanded to 2004
13:13 00937 Snapshot-2 commanded to 2001
06-May 09:34 to 15:59 00949 to 00953 IOR#11 A207 Reporting Anomaly Test performed
    Commands sent to disable and re-enable auto gain offset loop and check command execution reporting in Report Formats
09-May 09:36 to 17:50 00992 to 00997 Pixel Map Optimisation Test performed
11-May 06:50 01019 Pixel Map with Extended Along-Track Swath loaded
10:14 01021 Default Pixel Map loaded
12:54 01022 ENVISAT PL in SUSPEND (AATSR OFF)
15-May     AATSR Recovery from PL Suspend
08:07 01077 AATSR in STANDBY Mode
11:25 01079 Transition to HEATER Mode started, cooldown commenced
12:58 01080 Cooler to nominal compressor and displacer amplitude
16:02 01082 Transition to HEATER Mode complete
16:19 01082 Scan Mirror started
16:21 01082 AATSR to MEASUREMENT Mode
16-May     AATSR Auto Gain Offset Loop Test S-D-P-3.8
14:20 01095 Loop frequency commanded to 2048 scans
17:41 01097 Loop frequency commanded to 4096 scans
21:02 01099 Loop frequency commanded to 8192 scans
17-May     AATSR Auto Gain Offset Loop Test S-D-P-3.8
10:36 01107 Loop frequency commanded to 16384 scans
18-May     AATSR Auto Gain Offset Loop Test S-D-P-3.8
11:46 01122 Loop frequency commanded to 32768 scans
21:49 01128 Loop frequency commanded to 1024 scans (default)
19-May     AATSR Auto Gain Offset Loop Test S-D-P-3.8
11:10 01136 Number of temp samples set to 64 and number of irradiance samples set to 32
12:50 01137 Number of temp samples set to 128 and number of irradiance samples set to 64
14:31 01138 Number of temp samples set to 16 and number of irradiance samples set to 8
16:11 01139 Number of temp samples set to 8 and number of irradiance samples set to 4
17:52 01140 Number of temp samples set to 32 and number of irradiance samples set to 16 (default)
27-May     AATSR OFF due to ENVISAT PLSO for all instruments
28-May     ENVISAT recovery started
29-May     AATSR Recovery from PLSO
09:06 01278 AATSR in STANDBY
10:42 01279 Transition to HEATER Mode started
15:22 01282 AATSR in HEATER Mode
18:51 01284 Scan Mirror started
18:53 01284 AATSR in MEASUREMENT Mode
05-Jun 21:18 01385 Payload in SUSPEND due to Level 3 PROTOCOL INTERRUPT

10-Jun

 

 

AATSR recovery started

15:30

01453

AATSR in STANDBY Mode

17:59

01455

Transition to HEATER Mode started
22:33 01458 AATSR in HEATER Mode
11-Jun     AATSR recovery continued
12:48 01466 AATSR in MEASUREMENT Mode
18-Jun     AATSR Low-Gain Mode
07:04 01563 AATSR switched to low-gain mode over desert
15-Jul     Rerun of Cooler Optimisation Procedure S-D-P-3.3
07:45 01950 Cooler commanded to run at fixed amplitude of 7D(hex)
16-Jul     Cooler Optimisation - Cooler at different phase settings
08:55 01965 Cooler Phase commanded to 30(dec)
11:57 01967 Cooler Phase commanded to 31(dec)
14:57 01968 Cooler Phase commanded to 32(dec)
17:57 01970 Cooler Phase commanded to 33(dec)
20:57 01972 Cooler Phase commanded to 29(dec) Default Setting
17-Jul     Cooler Optimisation - Cooler at different balance settings
08:24 01979 Compressor Delta setting commanded 118(dec)
11:24 01981 Compressor Delta setting commanded 120(dec) Default Setting
14:24 01982 Compressor Delta setting commanded 122(dec)
17:24 01984 Compressor Delta setting commanded 128(dec) Default Setting
18-Jul     Cooler returned to amplitude control
09:35 01994 Cooler Compressor and Displacer commanded to zero amplitude
13:45 01996 FPA at 80K
19-Jul     Cooler Optimisation - control temperature at different settings
08:59 02008 Set Point Temperature commanded to 81K
13:58 02011 Set Point Temperature commanded to 84K
18:52 02014 Set Point Temperature commanded to 83K
23:57 02017 Set Point Temperature commanded to 80K Default Setting
22-Jul     FPA Outgassing
09:06 02051 Cooler Compressor and Displacer commanded to zero amplitudes

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