Administrative, NOAA-15 Gyroless Baseline On-Orbit Test on 29 November 2011 - Issued: 18 November 2011 14:50 UTC


NOAA-15 Gyroless Baseline On-Orbit Test

Date/Time(UTC) Message Issued:
November 18, 2011, 14:50:00 UTC

Satellite(s) Involved:

Instrument(s) Involved:
All Instruments

Product(s) Involved/Affected:
All data and products from NOAA-15

Date/Time(UTC) of Initial Implementation:
November 29, 2011, Time 14:45:40 UTC

Date/Time(UTC) of Expected End:
November 30, 2011, Time 22:25:50 UTC

Length of Outage: 31.67 hours

Details/Specifics of Change:
From 29 November 2011 (JDAY 333) at 14:45:40 UTC (orbit 70429) to 30 November 2011 (JDAY 334) at 22:25:50 UTC (orbit 70448), NOAA-15 will be placed into the Gyroless Mode for a baseline on-orbit test. The test consists of two parts: (a) about 30-hours of gyroless testing, and (b) a recovery with 1 orbit to verify that the spacecraft is back in YGC ACS control and performing as expected in reduced gyro estimated x. The short orbit recovery time comes about since no further ACS control modes are necessary to be evaluated by Engineering because NOAA-15 is presently flying with only 2 gyro axes (roll and pitch) with nominal yaw errors of less than .5 degrees (ground truth measurements). During the test period, NOAA-15 instrument L1b data will not be distributed due to the expected big geo-location errors of about 5 degrees.

This is another in a series of tests on the TIROS spacecraft as the enhanced software for rgyro and gyroless become available for each of the TIROS spacecraft. The next test on NOAA-15 will be with the enhanced gyroless flight software that is expected to reduce the nominal yaw errors to less than 1 degree. The test is being planned for the first calendar quarter of 2012.

Contact Person(s) Name/Email/Phone Number for Questions:
ESPC Operations at at 301-817-3880
Carl Gliniak at at 301-817-4207
Dejiang Han at at 301-817-4119

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