表面平整目标的电磁散射快速预估

Fast evaluation of electromagnetic scattering problems for flat surface targets

针对表面基本由平面构成的散射体,在传统弹跳射线法的基础上,对射线跟踪以及射线求交测试方法进行改进,使得该方法对于分析隐身飞行器等有更好的应用。研究了单根射线与三角形的快速求交方法,同时与弹跳射线法相结合,使用三角形对目标进行两次表面拟合,分别得到用于求交测试的稀疏三角面元,以及用于射线追踪的起始三角面元,利用快速求交方法,完成射线追踪,进行物理光学积分,完成目标远场电磁散射的快速预估,将该方法的计算结果与文献结果进行对比,验证了该方法的可靠性,通过计算不同拟合面元密度下情况下的结果,验证了该算法的高效性。

Based on traditional shooting and bouncing rays （SBR）, the ray-tracing procedure and intersection tests were im- proved for the flat surface scatterers. Combined with SBR, a fast method of ray/triangle intersection was studied. The surface of the targets was subdivided by triangles twice, obtaining low density of triangles used for intersection tests and high density of tri- angles used for ray tracing as the original ray tubes. After ray-tracing program, the electromagnetic scattering problem could be solved by physical optics （PO） integration. The results of the proposed method were compared with those in the references. The good agreement between the results proved the preciseness of this method. And the efficiency of the method was proved by the re- sults of different densities of subdivisions.