Modified Two-Scale Model for Electromagnetic Scattering from the Non-Gaussian Oceanic Surface  

作　　者：王运华 郭立新 吴振森 

机构地区：[1]School of Science, Xidian University, Xi'an 710071

出　　处：《Chinese Physics Letters》2005年第11期2808-2811,共4页中国物理快报（英文版）

摘　　要：Based on the skewness of sea waves, a modified two-scale model is developed for the non-Gaussian sea surface scattering. In this new model, a complementary term is added to the first-order scattering coefficient of the classical small perturbation method （SPM）, the additional part is proportional to the surface bispectrum and it is the critical part in explaining the scattering difference between upwind and downwind observations. Meanwhile, the effects of the shadowing function of the anisotropic surface, the curvature of the surface are also taken into account. The numerical results show the theoretical estimates obtained are consistent with the experimental result, and the influence of the wind speed, the trend and the incident frequency on the backscattering coefficients from the non-Gaussian oceanic surface is discussed in detail.Based on the skewness of sea waves, a modified two-scale model is developed for the non-Gaussian sea surface scattering. In this new model, a complementary term is added to the first-order scattering coefficient of the classical small perturbation method （SPM）, the additional part is proportional to the surface bispectrum and it is the critical part in explaining the scattering difference between upwind and downwind observations. Meanwhile, the effects of the shadowing function of the anisotropic surface, the curvature of the surface are also taken into account. The numerical results show the theoretical estimates obtained are consistent with the experimental result, and the influence of the wind speed, the trend and the incident frequency on the backscattering coefficients from the non-Gaussian oceanic surface is discussed in detail.

关 键 词：LOW-GRAZING ANGLES SEA-SURFACE ROUGH-SURFACE BACKSCATTERING WAVES SPECTRUM 

分 类 号：O462.2[理学—电子物理学]