分层介质目标电磁散射计算的快速射线追踪方法  

Fast ray-tracing method for electromagnetic scattering computation of multi-layered dielectric structure

作　　者：张磊 王超 董纯柱[1,2] 侯兆国 殷红成[1,2] 

机构地区：[1]电磁散射重点实验室,北京100854 [2]中国传媒大学信息工程学院,北京100024

出　　处：《电波科学学报》2015年第2期208-216,共9页Chinese Journal of Radio Science

基　　金：973项目(2010CB731905)

摘　　要：针对利用射线追踪方法计算分层介质目标散射时由于海量射线导致的资源和效率瓶颈问题,提出了改进的蒙特卡洛法和自适应射线细分法,实现对超电大分层介质目标高频电磁散射的快速计算.改进的蒙特卡洛法基于射线在介质分界面上反射和折射的能量分布,将射线分裂等效为按照特定概率发生反射或折射,射线追踪过程中射线数保持不变,而自适应射线细分法通过选择稀疏的初始射线,并根据目标结构和材质的变化自动细分加密,在保证计算精度的同时最大程度降低射线数.仿真试验与参考结果对比验证了本文方法的精确和高效,并分析了两种方法的优缺点,给出了适用范围以及在实际工程应用中的建议.Both the improved Monte Carlo method and the adaptive ray sub-division method are proposed to solve the bottle-neck problem of computation resource and efficiency resulting from the great number of rays for the ray-tracing method to calculate the electromagnetic(EM)scattering of multi-layered dielectric structure.The improved Monte Carlo method regards ray splitting as reflection or refraction separately based on special probability calculated by the energy distribution of the reflected and refracted rays,and the ray number keeps the same.The adaptive ray subdivision method reduces the number of rays farthest by choosing sparse initial rays,and ensures the calculation accuracy by adaptively adding rays based on the variety of structure and material.Simulation experiments and reference results show that the proposed two methods are accurate and efficient.Finally,the paper analyses the merits and demerits,and points out the scope of application and suggestions in practical aspect.

关 键 词：分层介质结构 射线追踪法 电磁散射 蒙特卡洛法 自适应射线细分法 

分 类 号：TN011[电子电信—物理电子学]