NOAA Office of Satellite and Product Operations

NOAA 15 ADACS Subsystem Summary

Component Description Status
ESA Earth Sensor Assembly Green
GYRO 1 Gyroscopic Rate Measuring Device #1 (YA, ZA) Green
GYRO 2 Gyroscopic Rate Measuring Device #2 (XA, ZB) Orange
GYRO 3 Gyroscopic Rate Measuring Device #3 (XB, YB) Yellow
IMU Inertial Measurement Unit Green
PTC 1A Pitch Torque Coil 1A Green
PTC 1B Pitch Torque Coil 1B Green
PTC 2A Pitch Torque Coil 2A Green
PTC 2B Pitch Torque Coil 2B Green
RWA S Skew Reaction Wheel Assembly Green
RWA X X-axis Reaction Wheel Assembly Green
RWA Y Y-axis Reaction Wheel Assembly Green
RWA Z Z-axis Reaction Wheel Assembly Green
RYTC 1A Roll-Yaw Torque Coil 1A Green
RYTC 1B Roll-Yaw Torque Coil 1b Green
RYTC 2A Roll-Yaw Torque Coil 2A Green
RYTC 2B Roll-Yaw Torque Coil 2B Green
SSA Sun Sensor Assembly Green

Subsystem History:

Date Time Component Description
08/11/2014 20:30   Clear Consistency Flag
01/25/2012 19:53:53   End GYROLESS test
01/24/2012 18:53:14   Start GYROLESS test
11/30/2011 20:49:52   End GYROLESS test
11/29/2011 14:49:10   Start GYROLESS test
03/15/2010 16:53:06   Set RYC to use primary coil
03/11/2010 19:51:30   Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Non-Control SCP)
03/11/2010 19:51:00 GYRO 2 Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Non-Control SCP)
03/11/2010 01:41:16   Pitch Coil Swap to Back-up
03/11/2010 01:28:36 RWA Z Pitch Wheel Bias set to 1300 RPM to enhance RGYRO performance (Control SCP)
03/11/2010 01:25:55 RWA Z Pitch Wheel Bias set to 1300 RPM (Non-Control SCP)
03/10/2010 23:49:54   Reduced gyro estimate X, #2 Gryo Off
03/10/2010 23:47:29   Disable Thrusters
03/08/2010 01:45:56   automatic switch to YGC
06/04/2009 17:08:00   Enables Auto Thruster Firings for both CPUs
06/04/2009 17:07:00   Change gas unloading threshold for pitch axis momentum from 40 in/lbs/sec to 45 in/lbs/sec for both CPUs
06/30/2006 12:00:00 RWA Z Z-reaction wheel transition toward positive values reversed. Trending back toward negative values. Wheel continues sticking as it passes through 0 RPM.
06/17/2006 12:00:00 RWA Z Whenever the Z-wheel speed passes through 0 RPM, in either direction, the wheel sticks for up to several minutes impacting pitch precision. Expect transition to full positive values on or about 5 Jul 06.
06/01/2006 12:00:00 RWA Z Z-reaction wheel (pitch) transitioning from a negative direction to a positive direction (for the first time ever). Pitch torquer coil intervention no longer required.
06/03/2004 18:25:00   Revised Mag. torquer constants to non control SCP
04/22/2004 18:20:00   Reduced gyro testing completed. Estimating all 3 axis successfully tested.
04/22/2004 16:45:00   Command ADACS to nominal mode.
04/22/2004 16:40:00   Ends estimate yaw-pitch test
04/22/2004 13:20:00   Preparatory commands for Yaw-Pitch estimate Rgyro test.
04/22/2004 13:20:00   Ends estimate yaw test
04/21/2004 12:03:00   Preparatory commands for Yaw Estimate Rgyro test
04/20/2004 23:46:00   Ends roll-pitch test
04/20/2004 22:05:00   Preparatory commands for Roll-Pitch estimate Rgyro test
04/20/2004 17:25:00   End estimate roll test
04/19/2004 22:30:00   Ends estimate pitch test
04/19/2004 16:05:00   Preparatory commands for pitch estimate and roll estimate Rgyro tests
04/19/2004 16:00:00   Start Reduced gyro testing series. Pointing precision during testing may be impacted. Testing is day shift (eastern time) 19, 20 and 22 Apr. 24 hour test on 21 Apr.
10/15/2003 19:40:00   Command N15 back to NOMINAL attitude control mode, test complete.
10/15/2003 16:15:00   Command N15 to YGC mode for baseline performance test.
03/15/2002 20:00:00 GYRO 3 Gyro 3 Turned OFF-test complete
03/11/2002 16:45:00 GYRO 3 Gyro 3 Turned ON for data gathering purposes
10/10/2001 16:45:00   Placed spacecraft back into normal ADACS mode
10/09/2001 13:51:00   Forced spacecraft into YGC mode
06/26/2000 00:00:00 GYRO 3 Gyro 3 powered off because of erratic readouts.
05/13/1998 16:24:00 PTC 2A On Orbit
05/13/1998 16:24:00 GYRO 3 On Orbit
05/13/1998 16:24:00 IMU On Orbit
05/13/1998 16:24:00 RYTC 1B On Orbit
05/13/1998 16:24:00 PTC 1A On Orbit
05/13/1998 16:24:00 GYRO 1 On Orbit
05/13/1998 16:24:00 PTC 1B On Orbit
05/13/1998 16:24:00 PTC 2B On Orbit
05/13/1998 16:24:00 GYRO 2 On Orbit
05/13/1998 16:24:00 RWA S On Orbit
05/13/1998 16:24:00 RWA X On Orbit
05/13/1998 16:24:00 RWA Y On Orbit
05/13/1998 16:24:00 RYTC 1A On Orbit
05/13/1998 16:24:00 RYTC 2A On Orbit
05/13/1998 16:24:00 RYTC 2B On Orbit
05/13/1998 16:24:00 SSA On Orbit
05/13/1998 16:24:00 ESA On Orbit
05/13/1998 16:24:00 RWA Z On Orbit