基于高频方法分析电大尺寸目标的散射

采用物理光学法及其改进方法分析电大目标的雷达散射截面。作为对物理光学方法的修正，采用等效电磁流法计算了物体棱边绕射场的贡献。由于电磁波在腔体内存在多次反射，物理光学方法对于腔体的电磁散射问题给出的结果误差较大。为此，可以采用迭代物理光学法和弹跳射线法计算腔体散射。分别采用迭代物理光学法和弹跳射线法方法计算了腔体电磁散射，并且对迭代物理光学法与弹跳射线法方法的优缺点进行了对比。最后，提出利用图形处理器加速弹跳射线法方法的射线追踪部分，实现了弹跳射线法方法的有效加速。数值结果表明上述方法是有效的。

Application of high frequency methods for scattering analysis of electrically large objects

The physical optics (PO) method and its improved methods are applied to analyze the radar cross section (RCS) of electrically large objects. To improve the PO method, an equivalent current method (ECM) is presented to obtain the contribution of wedge diffraction. Due to the multi-reflection of electromagnetic wave in cavities, the PO method can not predict the RCS of cavities correctly. To solve this problem, the iterative physical optics (IPO) method and shooting and bouncing rays (SBR) method are applied in the cavity scattering problems, and their merits and demerits are compared to analyze cavity problems. Finally, the graphics processing unit (graphics processing unit, GPU) technology is applied for the ray tracing procedure of SBR. As a result, SBR is significantly accelerated by the GPU technology. Numerical results demonstrate the accuracy and efficiency of the above methods.