三维复杂目标近区散射场的计算

针对复杂目标近场电磁散射特性问题，应用有限元全波数值方法计算复杂目标在赫兹偶极子辐射球面波照射下的散射特性. 由于有限元方法所计算的区域有限，为精确获得目标近区散射场，通过已得输出面上电流源和磁流源，推导得出空间中任意位置处的散射电场严格表达式，并将其用于计算复杂目标的近区广义雷达散射截面. 通过数值试验验证该严格计算公式的正确性，展示该方法对复杂目标近场电磁散射特性问题的有效性. 

Computation of Near-Field Scattering by 3-D Complex Target

To solve near field electromagnetic scattering characteristics by complex target, finite element method (FEM) was used to calculate scattering characteristics by complex target under Hertz dipole's radiation spherical wave. Because of the limited computation domain by FEM, scattering field anywhere in space was strictly deduced by the current and magnetic sources on the output interface which encloses the target. The strict scattering field was then used to compute the generalized radar cross section in target near field. Numerical experiments demonstrate the correctness of scattering formula and the validity of this method.