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Correlation and covariance of satellite scatterometer measurements

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Permanent URL	http://hdl.lib.byu.edu/1877/1034
Title	Correlation and covariance of satellite scatterometer measurements
BYU Creator	Long, David G.
Creator	Yoho, Peter K.
Keywords	Correlation; HYDROS; Hydrosphere States Mission; QuikSCAT; SeaWinds; covariance; scatterometry;
Description/Abstract	Capable scatterometer designs have been developed that seek improved resolution through the use of higher pulse sampling rates. The high sampling rates bring the traditional scatterometry assumption of measurement independence into question. This paper uses fundamental scattering theory to derive general expressions for correlation and covariance between scatterometer measurements and provides practical analysis using current and future instruments as examples. The paper derives expressions for the measurement variance parameter Kp when measurement correlation due to Rayleigh fading effects is present and relates Kp to the statistics of multiple pulse measurements. A function of the transmit signal modulation and receive processing, the measurement correlation is zero for nonoverlapping measurements but can become significant for overlapping measurements at high pulse sampling rates. The paper discusses the effects of correlation on the accuracy of scatterometer measurements and evaluates tradeoffs between spatial overlap, levels of additive noise, and measurement precision.
Source	Yoho, P. K., and D. G. Long. "Correlation and Covariance of Satellite Scatterometer Measurements." Geoscience and Remote Sensing, IEEE Transactions on 42.6 (2004): 1179-87;
Publisher	IEEE
Date Original	2004-06
Language	English eng en
Publication Type	Peer-Reviewed Articles
Type	Text
Format	application/pdf
Owning Institution	Brigham Young University
BYU College	Ira A. Fulton College of Engineering and Technology
BYU Department	Electrical and Computer Engineering
Copyright Status	(c) 2004 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.;
Copyright Use Information	http://www.lib.byu.edu/generic_copyright.html

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