基于P-M谱的二维各向异性分层海面电磁散射研究

Research on Electromagnetic Scattering from 2D Anisotropic Stratified Sea Surface with P-M Spectrum

为了得到基于P-M谱的二维各向异性分层海面电磁散射特性,以便为海洋遥感、海上目标检测与识别等领域的应用提供理论依据,采用微扰法研究了平面波入射分层介质粗糙面的电磁散射特性,结合海面P-M谱推导出了平面波入射时的散射系数计算公式,通过数值计算获得了HH极化下中间介质的介电常数和厚度、摩擦风速、风区范围、观察方向与逆风方向之间夹角和入射波频率对双站散射系数的影响,得到了分层海面电磁散射系数的基本特征、分区特征和随频率变化的特征。

In order to obtain the characteristics of electromagnetic scattering from the 2D anisotropic stratified sea surface with P-M spectrum for providing the theory basis to the field application such as ocean remote sensing, sea target detecting and idehtification, the electromagnetic scattering characteristics of rough surface of layered medium with plane wave incidence is investigated and the formulae of the scattering coefficient from stratified sea surface based on the P-M spectrum are derived by using the small perturbation method. The influence of the permittivity and the mean layer thickness of intermediate medium, friction wind speed, wind region, the angle between observational direction and upwind direction and the frequency of the incident wave on the bistatic scattering coefficient is obtained by numerical implementation, and the basic characteristics, the zonal characteristics and the characteristics with varying of incident wave frequency of stratified sea surface are obtained.