一种适用于条带SAR的快速后向投影算法  

A fast back-projection algorithm for stripmap SAR

作　　者：刘财安 李飞 张衡 LIU Caian;LI Fei;ZHANG Heng(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100190 [2]中国科学院大学,北京100049 [3]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电子设计工程》2022年第13期38-43,共6页Electronic Design Engineering

摘　　要：各类BP的快速算法通过子孔径合成的方式降低相近孔径间的数据冗余,减少成像计算量,然而这些快速算法大多只针对聚束SAR成像。为了实现条带SAR的高效率精确成像,该文通过聚束SAR和条带SAR的子孔径合成分析,指出条带SAR在子孔径合成中存在的孔径积分变化和角域欠采样现象,并提出一种基于线性成像网格的快速后向投影(FBP)算法。通过条带SAR的点目标仿真和实测数据实验,从成像质量和成像效率两个角度验证了该算法的有效性。Various fast algorithms of Back-Projection(BP)adopt subaperture synthesis approach to reduce the data redundancy between close apertures,and reduce the amount of imaging calculations.However,most of these fast algorithms are only for spotlight SAR imaging.In order to achieve high-efficiency and accurate imaging of stripmap SAR,this paper points out the integration aperture variation and angular domain under-sampling phenomenon in subaperture synthesis of stripmap SAR through spotlight SAR and stripmap SAR subaperture synthesis analysis,and proposes a Fast Back-Projection(FBP)algorithm based on a linear imaging grid.The effectiveness of this algorithm is verified from the perspectives of imaging quality and efficiencythrough stripmap SAR point target simulation and measured data experiments.

关 键 词：合成孔径雷达(SAR) 快速后向投影(FBP)算法 条带SAR成像 积分孔径 

分 类 号：TN957.52[电子电信—信号与信息处理]