A simplified asymptotic theory for ocean surface electromagnetic wave scattering

Type Article
Date 2007-08
Language English
Author(s) Mouche AlexisORCID1, 2, Chapron Bertrand2, Reul NicolasORCID2
Affiliation(s) 1 : Ctr Natl Etud Spatiales, Paris, France.
2 : IFREMER, F-29280 Plouzane, France.
Source Waves in Random and Complex Media (1745-5030) (Taylor & Francis), 2007-08 , Vol. 17 , N. 3 , P. 321-341
DOI 10.1080/17455030701230261
WOS© Times Cited 38
Abstract The normalized radar cross-section ( NRCS) expression of the Local Curvature Approximation (LCA-1) is derived to first order. The polarization sensitivity of this model is compared to the Kirchhoff Approximation ( KA), Two-Scale Model (TSM), Small Slope Approximation (SSA-1) and Small Perturbation Method (SPM-1) to first order in the backscattering configuration. Analytical comparisons and numerical simulations show that LCA-1 and TSM could be rewritten with the same formulation and that their polarization sensitivities are comparable. Comparisons with experimental data acquired in C- and Ku-band reveal that the polarization sensitivities of these models are not adequate. However, the NRCS azimuth modulation predicted by LCA-1 is found to be dependent on polarization and sea surface roughness. This property of the LCA-1 model yields to an azimuth modulation for the polarization ratio. Based on the surface curvature correction concept, a simplified electromagnetic model is proposed. The curvature correction is restricted to the resonant wave-number of the sea roughness spectrum. This is found to reproduce the polarization ratio given by experimental data versus incidence angle and wind speed.
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