Proceedings PaperPost-launch evaluation of the Advanced Microwave Sounding Unit-A on the NOAA-15 satellite
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The post-launch performance of the NOAA-15 Advanced Microwave Sounding Units-A was evaluated by analysis of the AMSU-A Level 1B data. We examined the main instrument characteristics, including the noise-equivalent uncertainty of temperature (NE(Delta) T), channel gains, instrument temperatures, and the cold space and blackbody radiometric counts, which are fused for on-board calibration. Short- and long-term trends of these instrument characteristics are presented. Effect of the instrument temperature on the radiometric calibration counts and channel gains are also demonstrated. It shows that the radiometric counts and channel gains correlate linearly with the instrument temperature. The NE(Delta) T values calculated from the AMSU- A 1B data compare favorably to those obtained from the pre- launch test data. All channels on the NOAA-15 AMSU-A have functioned well since its powering up after launch, except Channel 14 which has shown an anomalous behavior since early January 1999. THis study summarizes our evaluation of the AMSU-A performance during a four-month period of the NOAA-15 post-launch operation, and introduces the new AMSU-A data to data users.