TY - JOUR T1 - A simplified asymptotic theory for ocean surface electromagnetic wave scattering A1 - Mouche,Alexis A1 - Chapron,Bertrand A1 - Reul,Nicolas AD - Ctr Natl Etud Spatiales, Paris, France. AD - IFREMER, F-29280 Plouzane, France. UR - https://archimer.ifremer.fr/doc/00000/3001/ DO - 10.1080/17455030701230261 N2 - 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. Y1 - 2007/08 PB - Taylor & Francis JF - Waves in Random and Complex Media SN - 1745-5030 VL - 17 IS - 3 SP - 321 EP - 341 ID - 3001 ER -