高速平台SAR脉内多普勒效应误差分析和校正  

Error Analysis and Correction of Doppler Effect for SAR on High⁃Speed Platform

作　　者：金秋 王雨晗 杨果 王佳慧 毛新华 JIN Qiu;WANG Yuhan;YANG Guo;WANG Jiahui;MAO Xinhua(Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室,江苏南京211106

出　　处：《雷达科学与技术》2023年第3期237-246,共10页Radar Science and Technology

基　　金：国家自然科学基金(No.62071225);航空科学基金(No.2020Z017052001);江苏省自然科学基金(No.BK20211181)。

摘　　要：“停走停”近似模型被广泛运用于合成孔径雷达数据的处理,这种近似模型的误差对于大多数SAR来说可以忽略。然而,对于高速平台SAR,随着平台速度、斜视角以及积累时间的增加,这种近似误差往往无法忽略。如果不加以设计滤波器进行补偿,将会对成像结果在距离和方位向造成散焦以及发生位置变化。本文通过对“停走停”模型和脉内运动模型的比较,引入“停走停”近似带来的误差,分析其可忽略条件,建立精确的脉内运动模型。最后设计新的基于脉内运动的成像算法,并通过仿真结果验证该算法。“Stop⁃and⁃go”approximation model is widely used in synthetic aperture radar(SAR)data processing,and the error of this approximation model can be ignored for most SAR data.However,for high⁃speed platform SAR,with the increase of platform speed,squint angle and accumulation time,the approximate error can not be ignored.If the filter is not designed to compensate,it will cause defocus and position change in the distance and azimuth direction of the imaging results.In this paper,by comparing the“stop⁃and⁃go”model with the intra⁃pulse motion model,the error caused by the“stop⁃and⁃go”approximation is introduced,and the negligible condition is analyzed to establish an accu⁃rate intra⁃pulse motion model.Finally,a new imaging algorithm based on intra⁃pulse motion is designed and verified by simulation results.

关 键 词：高速平台 脉内运动 合成孔径雷达 误差分析 回波模型 

分 类 号：TN959.73[电子电信—信号与信息处理]