基于TF/SF方法的三维复合目标电磁散射FDFD研究  

3D FDFD Algorithm with TF/SF Technique for Electromagnetic Scattering from a Composite Target

作　　者：胡晓娟[1] 葛德彪[1] 魏兵[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《计算物理》2008年第3期309-314,共6页Chinese Journal of Computational Physics

基　　金：国防预研基金资助项目

摘　　要：分析三维频域有限差分(FDFD)中通过总场-散射场(TF/SF)边界引入入射波的方法.基于等效原理,在TF/SF边界处设置等效面电磁流,将入射波引入总场区.根据边界附近节点的位置特点,将方程式中的相关节点加入或扣除入射波的相应分量修正FDFD方程式,使得方程式中的各节点满足同为总场或同为散射场的条件.算例结果验证了该方法的正确性.利用FDFD方法计算涂敷吸波材料的复合von Karman型弹头和某导弹模型的双站RCS(radar cross section),数值结果说明该方法是分析复合目标电磁散射问题的一种有效方法.A total-field/scattered-field（TF/SF） technique is used to introduce an incident wave for a scattering problem in three-dimensional finite-difference frequency-domain（FDFD） method. According to the equivalence principle, an incident wave is introduced in total-field region by setting equivalent electromagnetic currents on TF/SF boundary. FDFD equations at nodes near TF/SF boundary are modified to satisfy conditions that all nodes involved belong either to total-field or to scattered-field. Numerical results validate this technique. The presented technique is mainly applied to scattering problem with a composite target,which is composed of perfectly electronic conductor（PEC） and lossy dielectric medium. Bistatic radar cross section（RCS） of a composite yon Karman missile warhead and a missile model are computed with FDFD method. The results demonstrate its applicability in analyzing electromagnetic scattering with composite targets.

关 键 词：复合目标 TF/SF方法 频域有限差分(FDFD)方法 电磁散射 

分 类 号：TN011[电子电信—物理电子学]