基于改进二维分形海面模型的分层海面电磁散射分析

用微扰法研究了平面波入射分层介质粗糙面的电磁散射。由改进的二维分形海面模型模拟实际的分层海面,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不同散射角的HH极化双站散射系数,并讨论了中间介质介电常数与厚度、摩擦风速和入射波频率对双站散射系数的影响,得到改进的二维分形分层海面散射系数的基本特征、分区特征和随频率变化的特征。结果表明：散射系数近似具有＂量子化＂特征。

Analysis on Electromagnetic Scattering from Stratified Sea Surface Based on an Improved 2D Fractal Model

The electromagnetic scattering from the rough surface of layered medium with plane wave incidence was investigated by using the small perturbation method in this paper. The formula of the scattering coefficient from stratified sea surface with an improved 2D fractal model were derived. The angular distribution of the bistatic scattering coefficient of HH polarization were obtained by numerical implementation, and the influence of the permittivity and the mean layer thickness of intermediate medium, friction velocity and the frequency of the incident wave on the bistatic scattering coefficient was discussed. The basic characteristics, the zonal characteristics and the characteristics with varying of frequency of the scattering coefficient from stratified sea surface were obtained. The numerical results showed that the scattering coefficient had ＂quantization＂ characteristic appreciatively.