| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
A simplified asymptotic theory for ocean surface electromagnetic wave scattering
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| Autores: |
Mouche, Alexis
Chapron, Bertrand
Reul, Nicolas
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| Data: |
2007-08
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| Ano: |
2007
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2007/publication-3001.pdf
DOI:10.1080/17455030701230261
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| Editor: |
Taylor & Francis
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| Relação: |
http://archimer.ifremer.fr/doc/00000/3001/
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| Formato: |
application/pdf
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| Fonte: |
Waves in Random and Complex Media (1745-5030) (Taylor & Francis), 2007-08 , Vol. 17 , N. 3 , P. 321-341
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| Direitos: |
2007 Taylor & Francis Group, an informa business
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