Subject: Product Outage/ Anomaly: NOAA-18 Reduced Gyro Enhanced Flight Software, Issued: July 31, 2012 1420 UTC
Topic: NOAA-18 Reduced Gyro Enhanced Flight Software upload patch for ESA quadrant conflicts On-Orbit Test in Estimate Yaw.
Date/Time Issued: July 31, 2012, 1420 UTC
Product(s) Involved/Affected: All data and products from NOAA-18 (AVHRR, AMSU-A, HIRS, MHS, & SBUV)
Date/Time of Initial Implementation: August 8, 2012, Time 16:07 UTC
Date/Time of Expected End: August 10, 2012, Time 18:51 UTC
Length of Outage: 50 hours and 48 minutes
Details/Specifics of Change:
From 8 August 2012 at 16:07 UTC (orbit 37196) to 10 August 2012 at 18:51 UTC (orbit 37226), NOAA-18 will be placed into the Reduced Gyro Mode for a flight software test, involving a patch for Earth Sensor Array (ESA) quadrant conflicts of the enhanced Reduced Gyro software. The first 24 hours will be for the baseline flight software and the second 24 hours for the penetration patch. The ESA patch provides new coefficients for the ESA quad penetration estimate as a function of altitude for use in N-18 Estimate Yaw when a joint sun and moon interference occurs on ESA. Products may be impacted by slightly larger than normal yaw attitude disturbances. The performance of NOAA-18 instrument L1b data is expected to be similar to the counterpart of NOAA-15, which has been operated in the enhanced Reduced Gyro Mode since March 17, 2010.
Upon exiting the test on August 10 on REV 37221 AOS 10:43 UTC, the spacecraft will be reconfigured for the normal operation (all three gyros available for ACS control). The spacecraft will be commanded back to nominal mode (all three gyros and sun sensor available for ACS control) on REV 37226 at 18:51 UTC. This is 5 orbits after the end of the Reduced Gyro Mode enhanced flight software test ESA quadrant conflict patch.
Backup dates due to a Critical Weather Day Period cancellation are about one month hence depending on the next dual sun/moon period for NOAA-18.
Products that use NOAA-18 that will be affected:
ATOVS Polar Soundings
Fire Identification Mapping and Monitoring Algorithm (FIMMA) for Hazard Mapping system (HMS) input
SST and Coastwatch
Microwave Surface and Precipitation Products (MSPPS)
Microwave Integrated Retrieval System (MIRS)
Ensemble Tropical Rainfall Potential (eTRaP)
Global Vegetation Index Products (GVI)
Contact Information for Further Information:
ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880
Carl Gliniak at email@example.com at 301-817-4207
Dejiang Han at firstname.lastname@example.org at 301-817-4119
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