GNSS-R双基SAR成像运动误差分析及补偿  

Motion error analysis and compensation of GNSS-R bistatic SAR imaging

作　　者：郝令政 朱云龙[1] 吴世玉 王博 HAO Lingzheng;ZHU Yunlong;WU Shiyu;WANG Bo(School of Electronic Information Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《导航定位学报》2019年第2期36-43,共8页Journal of Navigation and Positioning

基　　金：地理信息工程国家重点实验室基金项目(SKLGIE2017-Z-2-3)

摘　　要：针对GNSS-R双基SAR成像系统中存在的运动误差问题,建立基于GNSS-R信号的成像仿真系统:分析接收机运动误差对成像结果的影响并给出解决方法,重点分析恒定速度误差、线性速度误差和周期性速度误差3种情况;并通过频域相位的方法进行误差参数运动补偿。仿真结果表明,运动补偿后的图像分辨率显著提高,验证了算法对GNSS-R SAR系统运动补偿的有效性。Aiming at the problem that there exist motion errors in GNSS-R bistatic SAR imaging system,the paper proposed a simulation system of imaging with GNSS-R signals:the influence of the motion errors of receivers on imaging results was analyzed with corresponding solution,and the constant velocity error,the linear velocity error and the periodic velocity error were focused on;then the method of frequency domain phase was used to make the motion compensation of error parameters.Simulational result showed that the image resolution with motion comensation could be improved significantly,which verified the validity of the motion compensation for GNSS-R SAR system by the proposed method.

关 键 词：全球卫星导航系统 合成孔径雷达 误差分析 后向投影算法 误差补偿 

分 类 号：P228[天文地球—大地测量学与测量工程]