超宽带电磁散射的时间步进法

An Analysis of Marching-on-in-time Method for Ultra-widebandElectromagnetic Scattering Problems

采用时间步进法对飞机的基本构成部件(球、圆柱、薄板)的超宽带电磁散射问题进行了研究。导出了磁场积分方程数值计算公式,所得时域散射远场与实测或其它方法计算结果相比,吻合较好。本方法与时域有限差分法(FDTD)相比,无须设置吸收边界条件,适于成像数据的提取,运算简便。与频域方法相比,它可解决超宽带电磁散射预测问题。

The marching-on-in-time method is employed in analyzing the ultra-wideband electromagnetic scattering problems of aircraft's basic parts (sphere, cylinder, sheet metal). A magnetic field integral equation is derived, and the result obtained is better in coincidence as compared with the measured or other computed result. The method introduced in this paper is effective, without setting the absorbing boundary conditions, and simple in computation. Its results can be used for imaging reconstruct of radar targets compared with FDTD method, and this method can also be used for solving EM scattering problems of ultra-wideband in comparison with the method used in frequency domain.