基于改进二维分形海面模型的分层海面电磁散射分析  

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

作　　者：任新成[1,2] 郭立新[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071 [2]延安大学物理与电子信息学院,陕西延安716000

出　　处：《上海航天》2009年第4期1-6,共6页Aerospace Shanghai

基　　金：国家自然科学基金(60571058);高等学校博士学科点专项科研基金(20070701010)

摘　　要：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。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.

关 键 词：电磁散射 微扰法 二维分形海面模型 分层海面 双站散射系数 

分 类 号：TN011[电子电信—物理电子学]