NOAA Office of Satellite and Product Operations

Please Note:  

Update 7/10/2020: GOES-15 supplemental operations will begin on Sunday, August 9, 2020 at 0000 UTC and continue through Thursday, September 3, 2020 1600 UTC. See notification for more details.

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NOAA 18 ADACS Subsystem Summary

Component Description Status
ESAEarth Sensor AssemblyGreen
IMUGreen
MIMU-1Miniature Inertial Measurement Unit -1Green
MIMU-2Miniature Inertial Measurement Unit -2Yellow
PTC 1APitch Torque Coil 1AGreen
PTC 1BPitch Torque Coil 1BGreen
PTC 2APitch Torque Coil 2AGreen
PTC 2BPitch Torque Coil 2BGreen
RWA SSkew Reaction Wheel AssemblyGreen
RWA XX-axis Reaction Wheel AssemblyGreen
RWA YY-axis Reaction Wheel AssemblyGreen
RWA ZZ-axis Reaction Wheel AssemblyGreen
RYTC 1ARoll-Yaw Torque Coil 1AGreen
RYTC 1BRoll-Yaw Torque Coil 1BGreen
RYTC 2ARoll-Yaw Torque Coil 2AGreen
RYTC 2BRoll-Yaw Torque Coil 2BGreen
SSASun Sensor Assembly


Subsystem History:

Date Time Component Description
10/11/201716:23:16SSAEnable use of Sun Sensor Update; Return to nominal configuration
09/28/201713:56:57SSADisable use of Sun Sensor Update
04/14/201616:11:36SSAAdjust Sun Sensor Calibration to correct for a +0.08 deg error in Yaw.
12/08/201516:01:39MIMU-1Configure the spacecraft for Estimated Roll and Pitch (ESTYZ)NON-CONTROL SCP
12/08/201514:20:53MIMU-1Configure the spacecraft for Estimated Roll and Pitch (ESTYZ)CONTROL SCP
07/16/201513:21:58MIMU-1Restore CPUA Telemetry Data
07/16/201511:45:48MIMU-1To gather MIMU raw data at a 10 Hz rate by overwriting all CPUA telemetry data
01/13/201514:59:51MIMU-1Attitude mode set to GYE.
04/08/201414:19:41ESALoad new ESA quadrant 1 coefficients to non-control SCP.
04/02/201413:50:17ESALoad new ESA quadrant 1 coefficients to control SCP.
03/07/201417:46:19MIMU-1MIMU1 Z Gryo Failed. No impact to spacecraft attitude since failure.
10/08/201314:45:41 Disable thruster firing
09/16/201313:48:21ESADisable the use of ESA quadrant 1 for 14 orbits.
08/27/201317:31:00ESAClear ESA Ground Quadrant Use Word to 0000
08/27/201314:10:32ESASet ESA Ground Quadrant Use Word to 0001
08/10/201217:32:21 Enable Thruster Firing
08/10/201217:30:49 Put ADACS back to Nominal mode
08/10/201210:48:30 Exiting RGYRO ESTX mode
08/08/201216:14:30 Going into RGYRO ESTX mode to test new ESA coefficients for sun/moon intuitions on the ESA quad detectors.
08/08/201216:13:54 Disable thruster firing
02/23/201221:26:42 Enable thruster firing
02/23/201221:25:27 Put ADACS back to Nominal mode
02/23/201217:53:56MIMU-1End MIMU1 GYE test
02/21/201218:17:09MIMU-1Start MIMU1 GYE Test
02/21/201215:13:38MIMU-1Start MIMU1 ESTX test
02/21/201213:26:42 Disable thruster firing
10/19/201120:54:50 Enable thruster firing
10/19/201120:53:42 Put ADACS back to nominal mode
10/19/201117:37:12 End ESTX MIMU2 test
10/19/201112:42:01 Start ESTX MIMU2 test
10/19/201112:34:09 Disable thruster firing
09/21/201115:57:31 Enable thruster firing
09/21/201115:56:10 Put ADACS back to nominal mode
09/21/201112:35:42 End ESTX MIMU1 test
09/20/201112:47:15 Start ESTX MIMU1 test
09/20/201112:45:29 Disable thruster firing
04/17/201118:45:09 Enables GN2 Thrusters and Auto Thruster Firing Software
04/17/201118:44:06 Clears ADACS Yaw Update Limit and Forced YGC flags, and then commands the ADACS to Nominal mode
04/17/201115:41:35 End RGYRO mode test - ESTX
04/16/201112:34:08 Setup to start RGYRO mode test - ESTX
08/17/201020:31:00MIMU-2MIMU 2 OFF - end of Test 2 - Gyroless mode using MIMU2
08/17/201020:31:00MIMU-1MIMU 1 ON for end of Test 2 - Gyroless mode using MIMU2
08/17/201020:31:00 End Test 2 - Gyroless mode using MIMU2
08/17/201020:20:07 Begin Test 2 - Gyroless mode using MIMU2
08/17/201020:20:07MIMU-1MIMU 1 OFF for Test 2 - Gyroless mode using MIMU2.
08/17/201020:20:07MIMU-2MIMU2 ON for Test 2 - Gyroless mode using MIMU2
08/11/201013:09:43 End Test 1 Gyroless mode using MIMU1.
08/10/201011:41:16 Began Test 1 Gyroless mode using MIMU1.
10/06/200917:15:00 Extract MIMU LIM data to CPUTLM7 for Control OBP
10/06/200915:51:00 Extract MIMU LIM data to CPUTLM7 for Non-Control OBP
06/16/200918:26:54 Disable CPU Switching due to MIMU Failure, control-CPU
06/16/200918:26:26 Disable CPU Switching due to MIMU Failure, non-control CPU
06/15/200918:37:55 Increase pitch RWA bias from 1600 RPM to 2500 RPM, control CPU (Critical CMD)
06/15/200918:37:11 Increase pitch RWA bias from 1600 RPM to 2500 RPM, non-control CPU (Critical CMD)
06/11/200917:40:28 Clear MIMU Switch due to Go/NoGo for non-control CPU
06/11/200917:39:57 Clear MIMU Switch due to Go/NoGo for control CPU
06/11/200917:39:24 Clear the SUBCYCER error counter
06/11/200917:38:53 Bias the pitch wheel to 1600RPM (Critical CMD)
06/11/200917:38:13 Change gas unloading threshold for pitch axis momentum from 45 in/lbs/sec (2Dhex) to 145 in/lbs/sec (91hex), control CPU
06/11/200917:37:47 Change gas unloading threshold for pitch axis momentum from 45 in/lbs/sec (2Dhex) to 145 in/lbs/sec (91hex), non-control CPU
06/10/200912:00:00MIMU-2NOAA-18 MIMU2 failure
06/09/200916:37:51 Clear the X-Axis Thruster counters
06/09/200916:37:22 Z-Axis Thruster (NACTZ)
06/09/200916:37:07 Clear the X-Axis Thruster counters
06/09/200916:36:50 X-Axis Thruster (NACTX)
06/09/200916:36:31 Monitors thrurster activity
06/09/200916:33:42 Clears ADACS Yaw Update Limit and Forced YGC flags, and then commands the ADACS to Nominal mode
06/08/200921:42:00 Force YGC
06/08/200921:42:00 Enable Coil Switching
06/08/200921:42:00RYTC 1BSwap back to primary coil
06/07/200919:48:00RYTC 1BSwapped RY Coil due to MIMU Swap
06/07/200918:47:14MIMU-2At 18:47:22z on 7 June 2009 (JD158), S/C tripped into YGC following an unexpected attitude disturbance.
12/09/200818:08:42 Enables Auto Thruster Firings for both CPUs
12/09/200818:07:30 Change gas unloading threshold for pitch axis momentum from 40 in/lbs/sec (28hex) to 45 in/lbs/sec for both CPUs (2Dhex)
11/13/200817:38:00 Disable yaw, roll, pitch reasonableness tests in control and non-control SCP.
08/19/200812:33:00 Disables gas and automatic thruster firing.
08/18/200818:15:00 4 miscompares, ARRTLM Val=1 AMIMSWIN Val=1 AMIMUON1 Val=1 AMIMUON2 Val=0. A thruster unload was executed by the spacecraft. Additional control logic enabled in case of a close approach with debris from the Chineses Sat. Onboard s/w initated the thruster pulse (+ pitch) when the momentum threshold was exceeded. During the + pitch thruster firing the ROLL reasonableness test failed on the NON control side, which caused the MIMU to switch from MIMU 2 to MIMU 1, and set MIMU switching to INHIBIT.
08/18/200809:30:00 Enables Auto Thruster Firings
01/25/200612:00:00PTC 1APitch torquer coil inactive while spacecraft Z-momentum (pitch) transitions from a positive value range to a negative value range (while Z-Rwheel does the exactly the opposite). Considered rare but not anomalous.
11/03/200512:00:00PTC 1APitch torquer coil inactive while spacecraft Z-momentum (pitch) transitions from a negative value range to a positive value range (while Z-Rwheel does the exactly the opposite). Considered rare but not anomalous. Transition complete on 18 Nov 05.
05/27/200518:50:00 End reduced gyro test. COmmand ADACS back to nominal mode using all gyro axis’.
05/27/200517:07:00 Reduced gyro test, estimate pitch. Knockout out pitch gyro for 1 rev.
05/25/200514:20:00 New ephemeris loaded to control OBP.
05/23/200513:00:00 Attitude control commanded to NOMINAL mode (from YGC).
05/22/200519:45:00 Subtracted 3 full seconds from command clock because of drift.
05/22/200519:40:00 First on-orbit ephemeris upload to N18 spacecraft, nominal execution.
05/21/200512:20:00ESAESA to nominal algorythm. Spacecraft remains in YGC attitude control mode.
05/20/200521:55:00PTC 1Bon orbit, in use
05/20/200521:55:00PTC 2Aon orbit, standby mode
05/20/200521:55:00PTC 2Bon orbit, standby mode
05/20/200521:55:00PTC 1Aon orbit, in use
05/20/200521:50:00RYTC 1Aon orbit, in use
05/20/200521:50:00RYTC 1Bon orbit, in use
05/20/200515:00:00 Spacecraft attitude control in YGC mode
05/20/200511:52:00RWA Zon orbit, in use
05/20/200511:51:00RWA Yon orbit, in use
05/20/200511:51:00MIMU-2on orbit
05/20/200511:50:00RWA Xon orbit, in use
05/20/200511:50:00SSAon orbit
05/20/200511:50:00MIMU-1on orbit
05/20/200511:50:00RWA Son orbit, standby mode
05/20/200511:50:00RYTC 2Aon orbit, standby mode
05/20/200511:50:00RYTC 2Bon orbit, standby mode
09/24/198810:36:00IMUOn Orbit