Keywords
atmospheric techniques, meteorological radar, radar theory, remote sensing by radar, wind
Abstract
A wind scatterometer makes measurements of the normalized radar-backscatter coefficient O of the ocean surface. To retrieve the wind, a geophysical model function (GMF), which relates O to the near-surface wind, is used. The wind vector can be estimated using maximum-likelihood techniques from several O measurements made at different azimuth angles. The probability density of the measured O is assumed to be Gaussian with a variance that depends on the true O and therefore, depends on the wind through the GMF. With this model for wind estimation, the Cramer-Rao (C-R) bound is derived for wind estimation, and its implications for wind retrieval are discussed. As part of this discussion, the role of geophysical modeling error is considered and shown to play a significant role in the performance of near-surface wind estimates. The C-R bound is illustrated using parameters from the ERS AMI, NSCAT, and Sea Winds scatterometers.
Original Publication Citation
Oliphant, T. E., and D. G. Long. "Accuracy of Scatterometer-Derived Winds using the Cramer-Rao Bound." Geoscience and Remote Sensing, IEEE Transactions on 37.6 (1999): 2642-52
BYU ScholarsArchive Citation
Long, David G. and Oliphant, Travis E., "Accuracy of scatterometer-derived winds using the Cramer-Rao bound" (1999). Faculty Publications. 610.
https://scholarsarchive.byu.edu/facpub/610
Document Type
Peer-Reviewed Article
Publication Date
1999-11-01
Permanent URL
http://hdl.lib.byu.edu/1877/1012
Publisher
IEEE
Language
English
College
Ira A. Fulton College of Engineering and Technology
Department
Electrical and Computer Engineering
Copyright Status
© 1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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