基于弹跳射线技术的三维GTD模型构建方法  

3D-GTD model construction method using the shooting and bouncing ray technique

作　　者：陆金文 闫华[1] 张磊 殷红成[1] LU Jinwen;YAN Hua;ZHANG Lei;YIN Hongcheng(Science and Technology on Electromagnetic Scattering Laboratory, Beijing Institute of Environmental Features, Beijing 100854, China)

机构地区：[1]北京环境特性研究所电磁散射重点实验室,北京100854

出　　处：《系统工程与电子技术》2021年第8期2028-2036,共9页Systems Engineering and Electronics

基　　金：国家重点研发计划(2018YFC0825804)资助课题。

摘　　要：传统的基于弹跳射线(shooting and bouncing ray,SBR)技术的散射中心提取方法只考虑了理想点模型,但理想点模型无法描述散射中心的频率依赖特性。对此,提出一种基于弹跳射线技术的三维几何绕射理论(geometrical theory of diffraction,GTD)模型构建方法,在通过传统方法获取的理想点模型的基础上,利用射线管数据正向推算散射中心的频率依赖参数并修正其径向位置,实现了高精度三维GTD模型构建。仿真结果表明,点频、单视角下构建的三维GTD模型不仅能准确重构相同条件下的雷达散射截面(radar cross section,RCS),还能实现宽带RCS外推,能够满足目标宽带散射数据高效压缩和快速重构的应用需求。The traditional scattering center extraction method based on shooting and bouncing ray(SBR)technique only considers the ideal point model,which is unable to describe the frequency dependence of scattering centers.Therefore,a SBR-based method of three dimensional geometrical theory of diffraction(3D-GTD)model construction is proposed.Based on the ideal point model obtained by the traditional method,using ray-tube data,the frequency dependence parameters are forward determined and the down-range locations are corrected for scattering centers.The construction of high-precision 3D-GTD model is achieved.Simulation results show that the 3D-GTD model constructed at single frequency and single view can not only precisely reconstruct radar cross section(RCS)data under the same conditions,but also achieve RCS extrapolation within a wide frequency band.The proposed method is able to meet the application requirements of efficient compression and fast reconstruction of wide-band target scattering data.

关 键 词：散射中心建模 三维几何绕射理论模型 径向位置修正 弹跳射线技术 

分 类 号：TN95[电子电信—信号与信息处理]