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On the ability of rough surface scattering approximations to predict hydrodynamic modulation of the ocean radar cross section - A numerical studyScattering from the ocean surface at microwave frequencies is often described by the Bragg scattering model or the two-scale model. Here, the ability of these models to predict cross section modulation is investigated by comparing Bragg and two-scale cross-sections with cross sections calculated by a numerical electromagnetic approach. The numerical method is used as the standard of comparison. For slightly rough surfaces, the Bragg model is found to be very accurate, but for much rougher surfaces, the two-scale model is superior and should be used for calculating both the absolute cross section and the change in cross section due to spatial or temporal modulation of the ocean wave height spectrum. These results are relevant to the interpretation of SAR images of ocean surface phenomena which perturb the wave height spectrum at ripple wavelengths.
Document ID
19890066778
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Durden, Stephen L.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena; Stanford University CA, United States)
Vesecky, John F.
(Stanford University CA, United States)
Date Acquired
August 14, 2013
Publication Date
September 15, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
89A54149
Distribution Limits
Public
Copyright
Other

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