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Proceedings Paper

Sigma-0 retrieval from SeaWinds on QuikScat
Author(s): Ivan S. Ashcraft; David G. Long; Arden Anderson; Steve L. Richards; Mike Spencer; Brian Jones
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Paper Abstract

NASA has developed a new scatterometer, SeaWinds, which is scheduled to be launched on two missions, one in 1999 and the other in 2000. SeaWinds will measure the speed and direction of near-surface winds over the ocean. A fundamental part of the processing of SeaWinds data is the computation of (sigma) degree which includes solving the radar equation for every pulse sent and received by the scatterometer. However, for SeaWinds, this calculation is too computationally intensive to perform in real tie. Instead, a method of tabularizing most of the calculation has been developed. This method includes corrections for attitude and orbit perturbations and accounts for the elevation of the local topography. It also includes a table which will be used to assist ground data processing in determining the locations of the measurements. Tests comparing the tabulated result with the actual numerical calculations have shown that using this table is accurate to within +/- 0.1 dB and gives locations that are accurate to within 160 meters. We provide a description of this algorithm. The innovations developed as part of this algorithm may be of interest in processing data from other remote sensing systems.

Paper Details

Date Published: 24 September 1999
PDF: 8 pages
Proc. SPIE 3750, Earth Observing Systems IV, (24 September 1999); doi: 10.1117/12.363511
Show Author Affiliations
Ivan S. Ashcraft, Brigham Young Univ. (United States)
David G. Long, Brigham Young Univ. (United States)
Arden Anderson, Brigham Young Univ. (United States)
Steve L. Richards, Brigham Young Univ. (United States)
Mike Spencer, Jet Propulsion Lab. (United States)
Brian Jones, Brigham Young Univ. (United States)

Published in SPIE Proceedings Vol. 3750:
Earth Observing Systems IV
William L. Barnes, Editor(s)

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