基于时域弹跳射线与BP算法的聚束SAR目标电磁成像快速仿真方法  

A fast simulation method for spotlight SAR electromagnetic imaging using time domain SBR and BP algorithm

作　　者：杨鹏举 张蓉 吴瑞 田炜[1] YANG Pengju;ZHANG Rong;WU Rui;TIAN Wei(School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China;Key Laboratory for Information Science of Electromagnetic Waves(MoE),Fudan University,Shanghai 200433,China;School of Integrated Circuits and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]延安大学物理与电子信息学院,延安716000 [2]复旦大学电磁波信息科学教育部重点实验室,上海200433 [3]北京理工大学集成电路与电子学院,北京100081

出　　处：《电波科学学报》2025年第1期80-88,共9页Chinese Journal of Radio Science

基　　金：国家自然科学基金(62461054,62061048,62361054,62261054);陕西省重点研发计划(2023-YBGY-254)。

摘　　要：针对复杂群目标合成孔径雷达(synthetic aperture radar,SAR)电磁成像快速模拟问题,采用一种基于宽度优先搜索(breadth-first search,BFS)算法进行K-d树构建,显著提升了时域弹跳射线(time-domain shooting and bouncing ray,TDSBR)法的射线追踪效率。使用TDSBR法分析了复杂电大尺寸目标的时域电磁响应特性,结合后向投影(back-projection,BP)算法对雷达回波信号进行聚焦处理进而获得了复杂目标的高分辨SAR图像。通过与FEKO软件中的频域射线追踪算法进行对比,验证了本文TDSBR算法在复杂群目标SAR电磁成像快速模拟中的有效性和高效性。Aiming at the problem of rapid simulation of SAR electromagnetic imaging of complex group targets,a K-d tree construction based on breadth-first search(BFS)algorithm is used,which significantly improves the timedomain shooting and bouncing ray method(TDSBR)ray tracing efficiency.The time-domain shooting and bouncing ray method is used to analyze the time-domain electromagnetic response characteristics of complex electrically largesize targets.The radar echo signal is focused by combining the back-projection(BP)algorithm to obtain a highresolution synthetic aperture radar(SAR)image of the complex target.By comparing with the frequency domain ray tracing algorithm in FEKO software,the effectiveness of the proposed TDSBR algorithm in analyzing the electromagnetic scattering characteristics of complex group targets is verified.The imaging results show that TDSBR combined with the BP algorithm can effectively handle the SAR electromagnetic imaging simulation problem of complex group targets.

关 键 词：电磁散射 K-D树 时域弹跳射线(TDSBR)法 后向投影(BP)算法 聚束合成孔径雷达(SAR)成像 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]