基于三角网格的凸导体目标SB-ILDC算法

Triangular mesh based SB-ILDC with applications to perfectly conducting convex target scattering calculation

阴影边界增量长度绕射系数(SB-ILDC)可以用于计算电大尺寸目标在阴影边界处由不一致电流产生的表面绕射场,其在双站散射计算中对物理光学法(PO)有显著的修正作用。本文提出了一种基于三角网格模型的目标阴影边界寻迹算法,并将SB-ILDC拓展应用于三角网格模型光滑凸表面目标的宽带双站散射和高分辨率一维距离像的计算。通过典型目标计算结果同Mie级数解的对比,证明该方法对于凸导体目标PO散射场的修正是快速、显著的。

The shadow boundary incremental length diffraction coefficient（SB-ILDC）method can be used to approximate the surface diffractive field radiated by the nonuniform shadow boundary currents on electrically large sized targets,which greatly improves the accuracy of the physical optics（PO）technique in bistatic scattering calculation.In this paper,a shadow boundary search algorithm based on triangular mesh model is proposed,SB-ILDC is extended to the wide-band bistatic scattering computation and high-resolution range profile（HRRP）synthesis of targets with convex smooth surfaces,which are represented by triangular mesh elements.Numerical results for typical targets are presented and compared with Mie series solution to demonstrate the validity and applicability of the proposed technique.