Data/hora: 15/06/2024 14:05:07

Provedor de dados: | 5
País: | France
Título: | A simplified asymptotic theory for ocean surface electromagnetic wave scattering
Autores: | Mouche, Alexis; Chapron, Bertrand; Reul, Nicolas.
Data: | 2007-08
Ano: | 2007
Resumo: | 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2007/publication-3001.pdf

DOI:10.1080/17455030701230261

Editor: | Taylor &amp; Francis
Relação: | http://archimer.ifremer.fr/doc/00000/3001/
Formato: | application/pdf
Fonte: | Waves in Random and Complex Media (1745-5030) (Taylor &amp; Francis), 2007-08 , Vol. 17 , N. 3 , P. 321-341
Fonte: | 2007 Taylor &amp; Francis Group, an informa business