Administrative: NOAA-16 Enhanced GYE Flight Software On-Orbit Test on 14 November 2012 - Issued: 8 November 2012 1600 UTC

Subject: Administrative: NOAA-16 Enhanced GYE Flight Software On-Orbit Test on 14 November 2012 - Issued: 8 November 2012 1600 UTC

Topic: NOAA-16 Enhanced GYE Flight Software On-Orbit Test

Date/Time Message Issued: November 08 2012, 16:00:00 UTC

Satellite(s) Involved: NOAA-16

Instrument(s) Involved: All Instruments

Product(s) Involved/Affected: All data and products from NOAA-16

Date/Time of Initial Implementation: November 14, 2012, 13:21:30 UTC

Date/Time of Expected End: November 15, 2012, 14:50:10 UTC

Length of Outage: 25.5 hours

Details/Specifics of Change:

From 14 November 2012 (JDAY 319) at 13:21:30 UTC (orbit 62628) to 15 November 2012 (JDAY 320) at 14:50:10 UTC (orbit 62642), NOAA-16 will be placed for an enhanced GYE flight software on-orbit test. Recall that NOAA-16 is in rgyro estimate roll (single gyro with two good axes). As a result, no special transitions through ACS (attitude control subsystem) modes are required. Present estimated roll error is in the range of 0.05 degrees (spec being .1 degrees per axis).

During the test period, NOAA-16 instrument L1b data may have geolocation errors out of SPEC. In general, the geolocation accuracy of NOAA-16 L1b data is expected to be close to that of NOAA-15, which has been operated in an enhanced reduced gyro mode since 2011-143. From GYE testing on NOAA-15 and 18 we expect the nominal yaw error to be less than 0.5 degrees with peak yaw error in the range of 1 to 2.0 degree range. The biggest/sharpest geolocation errors may occur during sun/moon intrusions on the ESA detector. There may be once or twice per orbit GYE yaw disturbances, which are expected to happen in a very short time period and to trigger geolocation errors up to a level of 20 to 25 km. However, the regions with that geolocation error are expected to be narrow. In addition, the big geolocation errors will mainly be observed near the two edges of scans.

The NOAA-16 instrument L1b data will be distributed throughout the test period, since the data will be useable for many users. For those users who have a strict geolocation accuracy need, they may want to block the data usage during the test period, from November 14, 2012, 13:21:30 (orbit 62628) UTC to November 15, 2012, 14:50:10 (orbit 62642) UTC.

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

Web Site(s) for applicable information: N/A