一种宽波束机载SAR运动误差的时域补偿方法  

Time-domain compensation algorithm for airborne wide-beam SAR motion error

作　　者：邓云凯[1] 谭鸽伟[1] 郑晓双[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《系统工程与电子技术》2009年第5期1078-1082,共5页Systems Engineering and Electronics

摘　　要：针对运动误差对机载SAR分辨率提高的严重制约和低载频雷达的应用场合,提出了一种宽波束机载SAR运动误差的时域补偿算法。该算法在对两步运动补偿后的方位向剩余运动误差随方位位置的变化特性进行研究的基础上,通过对原始SAR数据在频域分块,然后对分块数据在时域实现运动误差的补偿,从而克服了误差形式的限制,可获得高分辨率的SAR图像。给出了应用该方法的具体步骤,并通过仿真实验和真实SAR数据的成像结果证明了该算法的有效性。Aiming at both the motion error limits airborne SAR resolution seriously and the application of lower carry-frequency radars, a kind of time domain compensation algorithm for airborne wide-beam SAR mo tion errors is put forward. Based on the research of which the azimuth residual motion error varies with the azi- muth position after compensating two-step motion, the algorithm implements motion error compensation for ev ery divisional data block in time domain after the SAR data are divided into many small blocks in frequency do main, thus overcoming the limitation of the motion error form, and high-resolution SAR images are obtained. The realizing steps of this method is given, and simulation experimentation and real SAR data imaging results are given to prove the feasibility of the algorithm.

关 键 词：机载SAR 运动误差 宽波束 运动补偿 

分 类 号：TN958[电子电信—信号与信息处理]