基于时域弹跳射线法分析电大尺寸目标的散射  

Analysis of electromagnetic scattering of electrically large objects with time domain shooting and bouncing rays method

作　　者：丁建军[1] 陈磊[1] 刘志伟[1] 陈如山[1] 

机构地区：[1]南京理工大学通信工程系,江苏南京210094

出　　处：《系统工程与电子技术》2010年第9期1846-1849,1888,共5页Systems Engineering and Electronics

基　　金：国家重点基础研究发展计划(973计划)(2009CB320201);国家自然科学基金(60871013)资助课题

摘　　要：通过对频域弹跳射线法的表达式进行逆傅里叶变换推导出时域弹跳射线法的表达式,并且讨论了与时域弹跳射线法相关的八叉树加速算法、Nyquist抽样准则及遮挡判别方法。与时域低频方法(如时域有限差分法、时域积分方程法)相比,时域弹跳射线法的优点是计算速度快、所需内存少,是分析电大尺寸目标宽带雷达散射截面的高效方法。实际算例的数值结果表明,时域弹跳射线法与其他精确方法的结果吻合很好。The expression of time domain shooting and bouncing rays（TDSBR） method is derived from the expression of frequency domain shooting and bouncing rays（FDSBR） by the inverse Fourier transform.The topics,such as the octree acceleration algorithm,sampling criterion of Nyquist and the shaded elements identification,which are related to TDSBR method are also discussed.Compared with low frequency methods（such as FDTD,TDIE）,the memory requirement and simulation time are greatly reduced with the TDSBR method.Therefore it is an efficient method for analyzing the wide band RCS of electrically large objects.Numerical results indicate that the results of the TDSBR method are in good agreement with the results of the exact solutions.

关 键 词：时域弹跳射线法 逆傅里叶变换 电磁散射 雷达散射截面 

分 类 号：TN957[电子电信—信号与信息处理]