计算二维海面极化电磁散射的新方法  

New study of polarimetric scattering of the two-dimensional sea surface

作　　者：刘伟[1] 郭立新[1] 王蕊[1] 麻军[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《西安电子科技大学学报》2009年第3期517-523,共7页Journal of Xidian University

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

摘　　要：在基尔霍夫散射面元矩阵的基础上研究了一种计算二维模拟海面电磁极化散射的新方法,采用海面高度起伏矩阵以及x和y方向海面斜率矩阵描述二维海面,利用基尔霍夫近似推导出笛卡尔坐标系下椭圆极化入射时海面的散射场,得到了全极化雷达散射模型.仿真了不同条件下分形海面模型的全极化雷达后向散射截面及极化特征图,数值结果符合海面散射规律.由于该方法是对二维海面模型进行离散化分析,因此适用于多种海面模型.A new method for simulating polarimetric scattering on the rough sea surface is studied based on the matrix of the Kirchhoff scattering facet. A two-dimensional sea surface is described as a height matrix and two slope matrices in the x and y direction, an expression for the scattered field with the elliptic polarized incidence wave is calculated in the Cartesian coordinate system by Kirchhoff approximation and the model of fully polarized RCS is obtained. Finally the fully polarized backscattering RCS and polarization signatures of the fractal sea surface are simulated for different conditions and the results are in accord with the characteristics of sea surface scattering. This method can be applied to many sea surface models because it uses discrete analysis on the two-dimensional model, which is important for the retrievement of sea polarimetric information.

关 键 词：极化散射 分形海面 风速 极化特征图 

分 类 号：TN011[电子电信—物理电子学]