粗糙海面三维目标电磁散射的快速估算方法  

A fast approximation technique for EM backscattering calculation of 3-D target over rough sea surface

作　　者：崔凯[1] 许小剑[1] 毛士艺[1] 

机构地区：[1]电子信息工程学院,北京航空航天大学,北京100083

出　　处：《信号处理》2009年第1期58-62,共5页Journal of Signal Processing

基　　金：预先研究基金课题

摘　　要：本文使用物理光学法(PO)与区域投影法(AP),结合计算机图形学技术,将两面角反射器的计算原理应用于目标与海面之间的多次散射计算。给出了一种快速判定三维空间内三角形面元是否相交的方法以加速射线追踪。针对Pierson-Moscowitz谱生成的海面,考虑海水的介电特性与海况的影响,计算了不同海况下的三维目标散射特性。并同文献结果进行了比较,表明本文的方法具有较好的准确性。This paper proposes a fast approximation technique for the electromagnetic （EM） backscattering calculation of three- dimensional （3-D） target over rough sea surface. By combining computer graphics （CG） ,Physical Optics （PO） and Area Projection （AP） methods are introduced to modify analytic modeling so that multiple scattering mechanism of dihedral comer reflector can be ex- tended to calculate the baekscattering from a target over sea surface. To accelerate ray tracing, a method is introduced to determine whether two triangle facets in 3-D space have common area or not. Finally, using the sea reflection coefficient under different sea states generated by Pierson-Moscowitz spectrum, the RCS of two kinds of 3-D targets are computed, analyzed and compared with published results, demonstrating the usefulness of the current method.

关 键 词：三维目标 粗糙海面 多次散射 RCS 海谱模型 

分 类 号：TN95[电子电信—信号与信息处理]