复合电磁散射分析中的精确几何建模

研究了二维导体粗糙面与三维半掩埋导体目标双站复合电磁散射，给出了一种粗糙面与目标复合电磁散射建模方案．首先利用谱方法生成随机粗糙面并利用逆向工程方法获得连续曲面，进而与半掩埋目标复合获得精确的三维复合模型．在精确几何模型基础上，根据入射波频率对其进行表面网格剖分．接着利用物理光学方法和多层快速多极子方法对单一导体粗糙面以及粗糙面与目标复合体模型的电磁散射特性进行研究，计算了双站雷达散射截面．

Accurate geometry modeling in analysis of composite EM scattering

An approach to studying composite electromagnetic (EM) scattering from the 2-D conducting rough surface and half-buried 3-D conducting target is proposed from geometry modeling to radar cross section (RCS) calculation. A two dimensional rough surface is simulated using the spectral method, which is then converted into a continuous curved surface through inverse engineering. The target model and rough surface model are combined together into a very accurate composite model, after which the surface mesh is generated with the information on the incidence frequency. Then the physical optics method (PO) and multi-level fast multiple algorithm (MLFMA) are respectively employed to study the scattering problem. The results of the single rough surface and the combinative model are given and compared.