NDLI: Anisotropy in reflected GPS measurements of ocean winds

Content Provider	IEEE Xplore Digital Library
Author	Garrison, J.L.
Copyright Year	2003
Description	Author affiliation: Purdue Univ., West Lafayette, IN, USA (Garrison, J.L.)
Abstract	The probability density function (PDF) of the ocean surface slope can be estimated from the code-correlation waveform of reflected GPS signals. Anisotropy in this PDF is found to correspond to the local near surface wind direction, suggesting the ability to resolve this direction using scattered signals from two or more GPS satellites. A two-stage estimation process was applied to sets of waveform data collected from an airborne delay-mapping GPS receiver. First, an isotropic normal distribution was assumed for the PDF. The mean square slope (MSS) was fit to the measured waveform data for each satellite independently. Differences between the MSS estimates from two satellites at different azimuths were observed. In the second step, a bidirectional normal PDF was used with MSS constrained to that obtained in the first step, and an assumed value was given for the ratio of upwind to crosswind slopes. The direction of the principal axes was then varied to minimize the total residuals for both satellites. The results were compared with buoy recordings of the local wind direction.
Starting Page	4480
Ending Page	4482
File Size	1473149
Page Count	3
File Format	PDF
ISBN	0780379292
DOI	10.1109/IGARSS.2003.1295553
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-07-21
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Global Positioning System Sea measurements Oceans Satellites Sea surface Delay estimation Probability density function Surface waves Signal resolution
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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