理想导体表面电磁散射的高阶微扰解

针对经典微扰法（SPM）求解粗糙表面电磁散射特性存在的问题，提出了一种基于二维表面场的一阶和二阶展开近似高阶微扰算法。用该法计算了高阶表面场分量的全极化后向散射SPM解和二阶场分量对水平极化双站及后向散射系数的修正解。研究了不同粗糙度下掠入射时高阶SPM求解的双站散射系数，以及不同方位角下高阶场量的散射特性。通过对合成场的修正，解决了近掠入射条件下散射系数计算的误差。数值计算结果证明该算法有效。

High-Order Small Perturbation Method for Perfectly Conducting Rough Surface

To solve the problem in electromagnetic scattering calculation by classical small perturbation method(SPM),a new high-order SPM was put forward based on first-order and second-order expansion approximation of 2-dimensional surface electric field in this paper.The full polarized backscattering coefficient of high-order surface electric field and horizontal polarized backscattering coefficient correction of second-order electric field were computed by this new method.The bistatic scattering coefficient solved in grazing incident for various surface roughness by high-order SPM and scattering characteristic of high-order electric field in different azimuth angle were discussed.The error in scattering coefficient calculation in low-grazing incident was corrected by modification of electric field integration.The numerical computation results showed that the method in this paper was effective.