Checking AIRS nonlinearity in flight

Thomas S. Pagano; Evan M. Manning; Steven E. Broberg; Hartmut H. Aumann

doi:10.1117/12.2530156

9 September 2019 Checking AIRS nonlinearity in flight

Thomas S. Pagano, Evan M. Manning, Steven E. Broberg, Hartmut H. Aumann

Proceedings Volume 11127, Earth Observing Systems XXIV; 1112717 (2019) https://doi.org/10.1117/12.2530156
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Radiances from the Atmospheric Infrared Sounder (AIRS) show excellent stability and are traceable to SI standards through the On-Board Calibrator (OBC) blackbody. The OBC can be used to check the nonlinearity by turning off the heater and letting the target float from 308K to roughly 261K while acquiring data. The OBC Float test was performed once prior to launch, and again shortly after launch. However, the OBC Float test did not produce accurate nonlinearity results because the temperature sensors became inaccurate below 290K. This paper summarizes a technique using a reference channel that is highly linear to measure the apparent temperature of the OBC, then using that temperature to determine the nonlinearity of the other channels. This method works well, and we are able to confirm the nonlinearity derived pre-flight for most of the channels. The AIRS has A side and B side channels that have different gain and nonlinearities, but the OBC float test was performed with an A/B optimum data set. We recommend repeating the test with A side and B side only gains selected for the channels.

Conference Presentation

Citation Download Citation

Thomas S. Pagano, Evan M. Manning, Steven E. Broberg, and Hartmut H. Aumann "Checking AIRS nonlinearity in flight", Proc. SPIE 11127, Earth Observing Systems XXIV, 1112717 (9 September 2019); https://doi.org/10.1117/12.2530156

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