基于ECS+FIR的星载SAR快视成像算法  

A New Quick-look Algorithm for Spaceborne Synthetic Aperture Radar Based on ECS+FIR

作　　者：文竹[1] 周荫清[1] 陈杰[1] 

机构地区：[1]北京航空航天大学电子信息工程学院201教研室,北京100083

出　　处：《电子学报》2004年第6期933-937,共5页Acta Electronica Sinica

基　　金：国家"8 63"计划课题 (No .2 0 0 1AA1 350 50 )

摘　　要：常用的快视成像算法 (SPECAN算法、RD +FIR算法等 )无法满足大距离徙动条件下星载SAR成像处理的精度要求 .针对以上问题 ,本文提出了一种基于等效斜视模型的ECS +FIR滤波的快视成像算法 .该算法的运算量不随距离徙动量的增大而增加 ,适合于大距离徙动量的星载SAR数据快视成像 .该算法在距离向采用FIR滤波来降低信号采样率 ,在方位向利用SCANSAR原理采用部分孔径数据进行成像 ,从而有效地减小了成像处理的运算量 .论文详细地给出了ECS +FIR快视算法的原理和流程 ,并将该算法同SPECAN算法、RD +FIR算法进行了比较 .通过大量计算机仿真和对处理结果的对比分析 。In the space-borne SAR quick-look processing,it can not satisfy the process precision and the process speed simultaneously with the conventional quick-look algorithms,SPECAN,RD+FIR,etc,to process the echo data which has large range migration.To solve this problem,this paper presents a quick look algorithm:ECS+FIR (Extended Chirp Scaling and FIR filter) algorithm,which is based on the equivalent slant range model.The computation amount of this algorithm will not change with the increase of the range migration,so it is quite suitable to process the space-borne SAR echo data with large range migrations.In addition,this algorithm uses sub-aperture data in the azimuth processing instead of the FIR filter in azimuth,which reduces the computing amount.The principle and flow chart of the algorithm are discussed in details,and a comparison between the ECS+FIR and other quick look algorithms has been made.Several simulation study results are given to demonstrate the feasibility of the algorithm.

关 键 词：合成孔径雷达 快视成像处理 ECS算法 FUR滤波 

分 类 号：TN95[电子电信—信号与信息处理]