双基地SAR相位同步误差影响分析  

Analysis of Phase Synchronizaiton Error of Bistatic SAR

作　　者：刘永[1] 徐若曦[2] 冯彤 姚宏达[2] LIU Yong;XU Ruo-xi;FENG Tong;YAO Hong-da(Military Representatives Office of Astronautical Electromechanical System of Navy in Nanjing,Nanjing Jiangsu 210006,China;Beijing Institute of Control and Electronic Technology,Beijing 100038,China)

机构地区：[1]海军驻南京地区航天机电系统军事代表室,江苏南京210006 [2]北京控制与电子技术研究所,北京100038

出　　处：《计算机仿真》2019年第9期15-19,共5页Computer Simulation

摘　　要：相位同步设计是双基地SAR系统必须考虑的问题,其首要难点在于相位误差内涵及误差对成像质量恶化程度的分析。针对上述问题,在对三类误差进行数学分析的基础上,利用SystemVue仿真软件与Matlab协同建模,搭建了双基地SAR回波仿真模型,对点目标和舰船场景回波进行了仿真及CS算法处理。仿真结果表明,线性误差会导致图像在方位向平移。二次项误差引起回波主瓣展宽、副瓣抬高,造成方位向散焦。随机误差会显著抬高副瓣,增加图像噪声。量化分析结果对双基地SAR相位同步系统的设计具有指导意义。Phase synchronization design is one of the outstanding problems that must be considered in bistatic SAR system.The main difficulty is to analyze the connotation of phase error and the deterioration degree of image due to the error.In view of the above question,on the basis of mathematical analysis of three kinds of errors,the simulation model of bistatic SAR echo was built by using SystemVue simulation software and Matlab.Then simulation and CS algorithm processing of point target and scene echo were carried out.The results show that the linear error causes the image to shift in the azimuth direction,and quadratic term error causes the main lobe to widen,which leds the elevated sidelobe,and even the azimuth direction is out of focus.And random error can raise the sidelobe,which will increase the noise.The results have some guiding significance to the design counties of bistatic SAR phase synchronization system.

关 键 词：相位同步误差 仿真与建模 分析 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]