MODIS IOT Terra Weekly Report

Mission Operations Days: 2002/082 to 2002/088
March 22, 2002 20:00:00 GMT to March 29, 2002 20:00:00 GMT

The Terra spacecraft was autonomously put into Safe Mode on Tuesday, March 19, 2002, (2002/078) at 16:10:49 GMT. As a result, MODIS was also put into Safe Mode which turns off nearly all instrument components and closes the nadir and space view doors.

Terra returned to Normal Mode on Wednesday, March 20^th, 2002 (2002/079) at 16:35:00 GMT. Shortly thereafter, MODIS was transitioned to Standby Mode, the Space View Door was opened, and the scan mirror was started. There was no science production in this configuration.

An attempt was made to recover the instrument to Science Mode on Saturday, March 23^rd, 2002 (2002/082) at about 01:10 GMT. The instrument was transitioned to science mode. When the A-side formatter was powered on, the expected reset errors occurred. The formatter was commanded to upload mode in order for the formatter anomaly patches to be loaded, but the formatter never stabilized in upload mode. After waiting a couple of hours for the formatter to warm itself, it was still not responding and the instrument was returned to standby mode with the scan mirror rotating.

On Tuesday afternoon, March 26^th, 2002 (2002/083), upon powering the A-side Formatter, the MODIS Control Processor (CP) was able to make intermittent contact with the Formatter (FR). The MOD_SS_CP_UART_HUNT and MOD_SS_CP_UART_NORM both increased a few counts per eight second telemetry update for approximately one minute. For about one and a half minutes, the CP maintained a good serial link with the FR. The NORM counter incremented while the HUNT and RESET counters remained static. The Formatter then reset and no further communications were established that pass, even with the use of a standard FR reset command. The Formatter was turned off prior to the end of the contact.

During a second TDRS pass that afternoon, the A-side Formatter was once again powered on with the FR patch loads ready and waiting for a window of opportunity. The CP achieved intermittent contact with the FR for less than one minute, but then contact was lost with the Formatter for the rest of the contact. Three reset commands were sent before the formatter was turned off at the end of the contact. There was no stable period during which to load the formatter patches.

For the next recovery attempt, the A-side Formatter was turned on at 17:36 GMT on Wednesday, March 27^th, 2002 (2002/086). Shortly thereafter, a formatter upload reset command was issued. Initially, intermittent contact was established with the formatter as the UART_HUNT and UART_NORM counters both incremented during each eight second telemetry update. After a brief period, the UART_HUNT mnemonic ceased incrementing and a good link was established with the formatter. During the time, a brief 1-word memory patch was loaded to the upload region of the formatter to prevent the errors from resetting the system. The patch was loaded a second time for redundancy.

Note: The formatter engine temperature was about -19.9C when the patches were successfully loaded.

With the formatter in a stable upload mode, the standard formatter error correction patches were loaded to the normal region of the formatter and the software was restarted. After thirty minutes of stable formatter activity in the normal mode, MODIS was transitioned to Science Mode, the SCIABNORM flag was set to ABNORM, and the Blackbody was powered on the A-side to 315K.

At approximately 19:04 GMT, the formatter was reset, thus discarding the memory load patches. The reset is believed to be due to the extended time required to log statistics of the formatter events. The extra processing time may not have allowed the formatter to reset the watchdog timer as it normally does in its background task processing.

At this point, the plan reverted to warming the instrument and then re-trying to load the patches. The Blackbody duty cycle was set to FULL and the SRCA ATC activity inhibit IDs were cleared. A couple of formatter upload reset commands were also sent as an attempt to re-establish communications without success. Then, as the A-side Formatter Engine temperature warmed to about -8C, a formatter reset command appeared to have an effect. Intermittent UART_NORM counts were observed mixed with the UART_HUNT counts. A second upload reset command was issued followed by several attempts to load the quick 1-word memory patch to the formatter upload region. The fourth such memory load was finally accepted into the formatter and a stable upload mode was achieved. The 1-word memory load to the formatter normal mode was uploaded followed by a formatter restart command.

One thing to note is that when the formatter was restarted, the formatter event messages observed in the morning were not present and the formatter was able to reliably calculate the mirror scan period. Essentially, the formatter did not appear to being bearing as much of a processing burden. After an hour of stable operations, the blackbody temperature was set to the nominal 290K and its duty cycle set to one-third.

The MODIS instrument was stable throughout the night of Wednesday, March 27^th, 2002 (2002/086). The instrument cold focal planes began regulating at 83K at about 09:09 GMT. In the afternoon of March 28^th, the science data "tweaks lost during the safe mode transition were restored. This included updating the band five gain values, loading a modified ideal blackbody output table, and uplinking patches to the formatter to correct a known time code problem. All of these changes were made prior to a first set of SD/SDSM calibrations while the nadir door was still closed.

The Nadir door was commanded open at about 22:53 GMT on Thursday, March 28^th, 2002 (2002/087). Door movement was confirmed when the "closed" microswitch changed states from CLOSED to NOT_CLOSED, but the "open" microswitch never changed to the OPEN state. The door temperature did decrease dramatically which is a good indicator the door was opened successfully. An hour and a half later, at 00:20 GMT on March 29^th, 2002 (2002/088), the Nadir door microswitch spontaneously changed state from NOT_OPEN to OPEN.

Four Solar Diffuser calibrations were performed; two prior to and two following the nadir door opening.

Upcoming plans include evaluating whether or not to write the formatter patches to EEPROM, loading a patch to the MODIS Safe Mode transition command to not turn off the formatter, and updating the currently installed formatter patches to record a count of the formatter error events.

Terra Spacecraft and MODIS Instrument Status:

This Week’s Completed MODIS Activities:

2002/082 01:11:25-01:13:39 Real-time MODIS Transition to A-side Science Mode MOD_SCI_TXTN_A
2002/082 01:14:30-01:15:03 Real-time Attempt to reset Formatter to Upload Mode MOD_FR_RESET_UPLD
2002/082 01:15:15-01:15;50 Real-time Attempt to dump formatter patch memory part 1 MOD_MEM_DUMP(6,2,11706,0,1,1)
2002/082 01:26:44-01:26:58 Real-time Attempt to reset Formatter to Upload Mode MOD_FR_RESET_UPLD
2002/082 02:17:11-02:17:30 Real-time Clear memory load transfer MOD_MEM_HALT
2002/082 05:13:43-05:14:01 Real-time Attempt to reset Formatter to Upload Mode MOD_FR_RESET_UPLD
2002/082 05:14:54-05:15:13 Real-time Attempt to reset Formatter to Normal Mode MOD_FR_RESET_STD
2002/082 05:16:25-05:16:59 Real-time Turn off Formatter MOD_FR_OFF
2002/082 05:17:18-05:18:11 Real-time Turn on A-side Formatter MOD_FR_ON(‘A’)
2002/082 05:22:11-05:22:36 Real-time Run macro 0 to turn off most instrument components MOD_RUN_MACRO(0)
2002/082 05:23:12-05:24:18 Real-time Transition to A-side Standby Mode MOD_STBY_TXTN_A
2002/082 05:24:27-05:24:45 Real-time Turn on A-side Timing Generator MOD_TG_ON(‘A’)
2002/082 05:24:56-05:25:28 Real-time Turn on A-side Scan Assembly MOD_SA_ON(‘A’)
2002/082 05:57:27 Real-time FOT sets MODIS inhibit ID# 33 (CP)
2002/082 05:57:48 Real-time FOT sets MODIS inhibit ID# 53 (SDSM)
2002/082 05:58:21 Real-time FOT sets MODIS inhibit ID# 58 (SDD)

None

None

2002/085 19:17:15-19:17:52 Real-time Turn on A-side Formatter MOD_FR_ON(‘A’)
2002/085 19:27:24-19:28:20 Real-time Perform standard reset of the formatter MOD_FR_RESET_STD
2002/085 19:28:52-19:29:14 Real-time Turn off the Formatter MOD_FR_OFF
2002/085 20:02:16-20:02:42 Real-time Turn on A-side Formatter MOD_FR_ON(‘A’)
2002/085 20:06:21-20:06:50 Real-time Reset the Formatter to Upload Mode MOD_FR_RESET_UPLD
2002/085 20:10:21-20:11:09 Real-time Perform standard reset of the formatter MOD_FR_RESET_STD
2002/085 20:12:27-20:12:43 Real-time Reset the Formatter to Upload Mode MOD_FR_RESET_UPLD
2002/085 20:15:44-20:16:03 Real-time Turn off the Formatter MOD_FR_OFF
2002/085 23:59:39 Real-time FOT sets MODIS inhibit ID# 54 (SRCA)

2002/086 00:00:17 Real-time FOT clears MODIS inhibit ID# 53 (SDSM)
2002/086 00:00:46 Real-time FOT clears MODIS inhibit ID# 58 (SDD)
2002/086 17:36:08-17:36:30 Real-time Turn on A-side Formatter MOD_FR_ON(‘A’)
2002/086 17:36:52-17:37:08 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/086 17:37:49-17:38:13 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/086 17:38:58-17:39:22 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/086 17:45:02-17:45:49 Real-time Load Normal Formatter Patch part one MOD_MEM_LOAD(‘AM1_MPR_MODIS_FR_ANOMALY’,2,’N’,’DISABLE’,1,1)
2002/086 17:46:12-17:46:44 Real-time Load Normal Formatter Patch part two MOD_MEM_LOAD(‘AM1_MPR_MODIS_FR_RECOVERY’,64,’N’,’DISABLE’,1,2)
2002/086 17:47:04-17:47:18 Real-time Restart Formatter with A-state 0 MOD_FR_RESTART(0)
2002/086 18:19:11-18:22:23 Real-time Transition to A-side Science Mode MOD_SCI_TXTN_A
2002/086 18:22:49-18:23:33 Real-time Set SCIABNORM Flag to ABNORM MOD_SCI_ABNORM(‘ABNORM’)
2002/086 18:24:01-18:25:21 Real-time Turn on A-side Blackbody and set BB temp to 315K MOD_BB_ON(‘A’,’A’)

2002/086 19:04:31Formatter Reset occurs, patches are lost, no longer communicating with the formatter, science data production stops.

2002/086 19:18:11-19:18:22 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/086 20:38:27-20:38:48 Real-time Set Blackbody duty cycle to FULL (100%) MOD_SET_BB_DCYCLE(‘FULL’)
2002/086 20:40:41 Real-time FOT clears MODIS inhibit ID# 33 (CP)
2002/086 20:41:25 Real-time FOT clears MODIS inhibit ID# 54 (SRCA)
2002/086 20:43:40-20:43:50 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/086 21:00:00-21:51:39 ATC SRCA Full Spectral Part 1A (Macro 18)
2002/086 22:04:58-22:05:11 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/086 22:50:00-23:24:44 ATC SRCA Full Spectral Part 2A (Macro 19)
2002/086 23:05:48-23:06:00 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD

2002/087 00:05:01-00:05:12 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/087 00:08:08-00:08:24 Real-time Perform FR reset to Upload Mode MOD_FR_RESET_UPLD
2002/087 00:11:18-00:11:49 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/087 00:13:26-00:13:45 Real-time Clear Memory Load transfer MOD_MEM_HALT
2002/087 00:14:33-00:14:52 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/087 00:16:38-00:16:54 Real-time Clear Memory Load transfer MOD_MEM_HALT
2002/087 00:17:37-00:17:57 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/087 00:20:15-00:20:31 Real-time Clear Memory Load transfer MOD_MEM_HALT
2002/087 00:34:24-00:34:43 Real-time Load Fast Machine Error Patch to Upload Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST_UPLOAD’,1,’N’,’DISABLE’,1,1)
2002/087 00:36:48-00:37:17 Real-time Load Fast Machine Error Patch to Normal Memory MOD_MEM_LOAD(‘AM1_MPR_MODIS_KME_FAST’,1,’N’,’DISABLE’,1,1)
2002/087 00:37:44-00:37:56 Real-time Restart Formatter with A-state 0 MOD_FR_RESTART(0)

2002/087 00:38:11Stable communication established with the Formatter

2002/087 01:27:15-01:27:56 Real-time Set Blackbody temperature to 290K MOD_SET_BB_TEMP(1287)
2002/087 01:28:09-01:28:26 Real-time Set Blackbody duty cycle to THIRD (33%) MOD_SET_BB_DCYCLE(‘THIRD’)
2002/087 02:45:49 Real-time FOT sets MODIS inhibit IDs # 33 (CP) and #53 (SDSM)

2002/087 09:09:47MODIS Cold Focal Planes begin controlling at 83K

2002/087 18:09:06-18:20:00 Real-time Dump Table #5 (ideal Blackbody output values) MOD_MEM_DUMP(44,1800,0,0,1,57)
2002/087 18:23:00-18:26:45 Real-time Dump Table #4 (PV gain table) MOD_MEM_DUMP(36,5500,0,0,1,18)
2002/087 19:02:05-19:11:39 Real-time Load new ideal Blackbody output values table #5 MOD_MEM_LOAD(‘AM1_MPR_MODIS_BB_IDEAL_VALUES_TABLE_05’,1800,’Y’,’DISABLE’,1,57)
2002/087 19:11:57-19:12:44 Real-time Enable PV and PC DC Restore MOD_DCRESTORE(‘ON’,’ON’)
2002/087 19:13:25-19:13:38 Real-time Set new Band 5 Detector 1 gain value MOD_GAIN_CHANGE(5,1,66)
2002/087 19:13:50-19:13:58 Real-time Set new Band 5 Detector 2 gain value MOD_GAIN_CHANGE(5,2,63)
2002/087 19:14:10-19:14:24 Real-time Set new Band 5 Detector 3 gain value MOD_GAIN_CHANGE(5,3,65)
2002/087 19:45:25-19:45:38 Real-time Set new Band 5 Detector 4 gain value MOD_GAIN_CHANGE(5,4,66)
2002/087 19:45:53-19:46:04 Real-time Set new Band 5 Detector 5 gain value MOD_GAIN_CHANGE(5,5,63)
2002/087 19:46:23-19:46:35 Real-time Set new Band 5 Detector 6 gain value MOD_GAIN_CHANGE(5,6,63)
2002/087 19:46:51-19:47:02 Real-time Set new Band 5 Detector 7 gain value MOD_GAIN_CHANGE(5,7,59)
2002/087 19:47:40-19:47:52 Real-time Set new Band 5 Detector 8 gain value MOD_GAIN_CHANGE(5,8,60)
2002/087 19:48:04-19:48:17 Real-time Set new Band 5 Detector 9 gain value MOD_GAIN_CHANGE(5,9,55)
2002/087 19:48:27-19:48:40 Real-time Set new Band 5 Detector 10 gain value MOD_GAIN_CHANGE(5,10,54)
2002/087 19:48:54-19:49:09 Real-time Set new Band 5 Detector 11 gain value MOD_GAIN_CHANGE(5,11,54)
2002/087 19:49:20-19:49:38 Real-time Set new Band 5 Detector 12 gain value MOD_GAIN_CHANGE(5,12,53)
2002/087 19:49:52-19:50:07 Real-time Set new Band 5 Detector 13 gain value MOD_GAIN_CHANGE(5,13,51)
2002/087 19:50:18-19:50:38 Real-time Set new Band 5 Detector 14 gain value MOD_GAIN_CHANGE(5,14,53)
2002/087 19:51:23-19:51:34 Real-time Set new Band 5 Detector 15 gain value MOD_GAIN_CHANGE(5,15,54)
2002/087 19:51:46-19:51:57 Real-time Set new Band 5 Detector 16 gain value MOD_GAIN_CHANGE(5,16,54)
2002/087 19:52:10-19:52:22 Real-time Set new Band 5 Detector 17 gain value MOD_GAIN_CHANGE(5,17,50)
2002/087 19:52:41-19:52:55 Real-time Set new Band 5 Detector 18 gain value MOD_GAIN_CHANGE(5,18,59)
2002/087 19:53:08-19:53:22 Real-time Set new Band 5 Detector 19 gain value MOD_GAIN_CHANGE(5,19,57)
2002/087 19:53:36-19:53:49 Real-time Set new Band 5 Detector 20 gain value MOD_GAIN_CHANGE(5,20,55)
2002/087 19:59:22 Real-time FOT clears MODIS inhibit ID# 33 (CP)
2002/087 19:59:56 Real-time FOT clears MODIS inhibit ID# 53 (SDSM)
2002/087 20:01:18-20:01:59 Real-time Memory dump of formatter time code patch part 1 MOD_MEM_DUMP(6,1,7315,0,1,1)
2002/087 20:02:16-20:02:57 Real-time Memory dump of formatter time code patch part 2 MOD_MEM_DUMP(6,1,7333,0,1,1)
2002/087 20:03:13-20:03:54 Real-time Memory dump of formatter time code patch part 3 MOD_MEM_DUMP(6,1,7346,0,1,1)
2002/087 20:32:30-20:33:12 Real-time Load formatter time code patch #1 MOD_MEM_LOAD(‘AM1_MPR_MODIS_FR_MS_P ATC H1’,1,’N’,’DISABLE’,1,1)
2002/087 20:33:29-20:34:01 Real-time Load formatter time code patch #2 MOD_MEM_LOAD(‘AM1_MPR_MODIS_FR_MS_P ATC H1’,1,’N’,’DISABLE’,1,1)
2002/087 20:34:19-20:34:48 Real-time Load formatter time code patch #3 MOD_MEM_LOAD(‘AM1_MPR_MODIS_FR_MS_P ATC H1’,1,’N’,’DISABLE’,1,1)
2002/087 20:35:43-20:39:44 Real-time Dump Table #4 (PV gain table) MOD_MEM_DUMP(36,5500,0,0,1,18)
2002/087 20:40:04-20:40:47 Real-time Memory dump of formatter time code patch part 1 MOD_MEM_DUMP(6,1,7315,0,1,1)
2002/087 20:41:02-20:41:44 Real-time Memory dump of formatter time code patch part 2 MOD_MEM_DUMP(6,1,7333,0,1,1)
2002/087 20:42:01-20:42:41 Real-time Memory dump of formatter time code patch part 3 MOD_MEM_DUMP(6,1,7346,0,1,1)
2002/087 20:47:57-21:01:08 ATC SD/SDSM OA-16 Screened Fixed Sun A
2002/087 21:05:14-21:16:41 Real-time Dump Table #5 (ideal Blackbody output values) MOD_MEM_DUMP(44,1800,0,0,1,57)
2002/087 21:20:04-21:20:12 Real-time Disable CP status 06 alarm MOD_ALARMS_CP_ST_06(‘DISABLE’)
2002/087 21:20:42-21:20:49 Real-time Reset Formatter Reset Source alarm MOD_ALARMS_FR_SRC(‘ENABLE’)
2002/087 21:21:11-21:21:20 Real-time Reset UART Reset count alarm MOD_ALARMS_URT_RST(‘ENABLE’)
2002/087 22:26:50-22:40:01 ATC SD/SDSM OA-15 Open Fixed SD A
2002/087 22:52:33-22:56:36 Real-time Open Nadir Door MOD_NAD_TO_OPEN
2002/087 22:56:53-22:57:43 Real-time Dump Door position when trigger hit table MOD_MEM_DUMP(144,12,0,0,1,1)
2002/087 22:58:10-22:58:51 Real-time Set SCIABNORM flag to NORM MOD_SCI_ABNORM(‘NORM’)

2002/088 00:20:53Nadir door "open" microswitch spontaneously changes from NOT_OPEN to OPEN

2002/088 03:23:28-03:36:39 ATC SD/SDSM OA-16 Fixed Sun A
2002/088 05:02:20-05:15:31 ATC SD/SDSM OA-15 Open Fixed SD A

Upcoming Week’s MODIS Events:

A control processor memory patch will be loaded to prevent the formatter from being turned off during a safe mode transition. Two formatter patches will be loaded to include error event counting and fault register bit tracking.

Maneuvers:

There will not be a MODIS Lunar Calibration at the beginning of April because the required roll angle will exceed the allowable limit.

The sixth Terra inclination maneuver has been postponed. The new date for the maneuver is not yet known but a delay of at least two weeks is expected and the maneuver will only be done if it does not interfere with any Aqua spacecraft launch activities.

The Terra Deep Space Calibration Maneuver is still postponed. The maneuver date is not expected until late summer of 2002.

MODIS Anomalies:

See description at the top of this report.

The current patches loaded into the MODIS Formatter do not record the number of formatter error events. Patches to count the errors are expected to be loaded next week. For data on the pre-safe mode error events, please see the link below.

The most recent error tracking spreadsheets can be retrieved from:

An MS Excel spreadsheet called, AM1_FR_error_rollovers_current.xls contains the data for the times each error count "roll over" occurs.

General Instrument Comments:

MODIS is in A-side Science Mode. Both the NAD and SVD have been re-opened and fast 1-word patches have been loaded to the formatter to prevent resetting.

MODIS Telemetry Trends

The instrument has warmed to nominal temperatures. All systems appear to be functioning properly.

Non-MODIS Significant Events:

Science Data Loss Reports can be viewed at:

Select "Search Data Losses" and choose Data Type: MOD

Then press the big SUBMIT button.

Limited Life Item Status:

SRCA 10W Lamp #1: 197.5 of 500 hours
SRCA 10W Lamp #2: 150.6 of 500 hours
SRCA 10W Lamp #3: 159.8 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 559.2 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1835 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements

Email the MODIS IOT to report any problem with the MODIS IOT Web Pages.
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Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

Last Update: Thursday, 04-Sep-2003 18:14:23 EDT