Earth-viewing methods for on orbit assessment of ATMS observation system spatial response function
Abstract
As a key instrument on board the S-NPP satellite and future JPSS satellites, the Advanced Technology Microwave Sounder (ATMS), a cross-track scanner with 22 channels, provides sounding observations needed to retrieve profiles of atmospheric temperature and moisture for civilian operational weather forecasting, as well as continuity of these measurements for climate monitoring purposes. The ATMS observation system spatial response function is a fundamental important parameter since it enables an objective assessment of spatial resolution and provides basic characteristic data for instrument calibration and satellite data algorithm development. The ATMS observation system spatial response function is a combined result of the antenna pattern as well as the motion introduced by both cross track scanning and along track satellite movement during the sensor integration time. There is no on-board calibration device fully appropriate for the assessment of the observation effective system spatial response function. In this paper, an observation system spatial response retrieval algorithm based upon the earth-viewing is described. The algorithm uses a knife-edge scanning method to retrieve the line spread function (LSF) of the ATMS observation and a Filtered Back Projection algorithm based upon the Fourier slice theorem is applied to rebuild the instrument spatial response function. Preliminary retrieval results are presented.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMIN21A1382S
- Keywords:
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- 3360 ATMOSPHERIC PROCESSES Remote sensing