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GPS Signal Scattering from Sea Surface: Wind Speed Retrieval Using Experimental Data and Theoretical ModelGlobal Positioning System (GPS) signals reflected from the ocean surface have potential use for various remote sensing purposes. Some possibilities arc measurements of surface roughness characteristics from which ware height, wind speed, and direction could be determined. For this paper, GPS-reflected signal measurements collected at aircraft altitudes of 2 km to 5 km with a delay-Doppler mapping GPS receiver arc used to explore the possibility of determining wind speed. To interpret the GPS data, a theoretical model has been developed that describes the power of the reflected GPS signals for different time delays and Doppler frequencies as a function of geometrical and environmental parameters. The results indicate a good agreement between the measured and the modeled normalized signal power waveforms during changing surface wind conditions. The estimated wind speed using surface- reflected GPS data, obtained by comparing actual and modeled waveforms, shows good agreement (within 2 m/s) with data obtained from a nearby buoy and independent wind speed measurements derived from the TOPEX/Poseidon altimetric satellite.
Document ID
20020009131
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Komjathy, Attila
(Colorado Univ. Boulder, CO United States)
Zavorotny, Valery U.
(Colorado Univ. Boulder, CO United States)
Axelrad, Penina
(Colorado Univ. Boulder, CO United States)
Born, George H.
(Colorado Univ. Boulder, CO United States)
Garrison, James L.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Publication Information
Publication: Remote Sensing of Environment
Publisher: Elsevier Science, Inc.
Volume: 73
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Funding Number(s)
PROJECT: RTOP 622-47-55
CONTRACT_GRANT: NAG1-1927
Distribution Limits
Public
Copyright
Other

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