【作者】 张凌志； 刘飞峰； 曾涛；

【Author】 ZHANG Ling-zhi;LIU Fei-feng;ZENG Tao;Radar Research Laboratory,School of Information and Electronics,BIT;Key Laboratory of Electronic and Information Technology in Satellite Navigation(BIT),Ministry of Education;

【机构】 北京理工大学信息与电子学院； 卫星导航电子信息技术教育部重点实验室(北京理工大学)；

【摘要】 使用导航卫星作为外辐射源构成的差分干涉SAR是近年来兴起的一种新型对地观测手段。由于在长时间数据采集下,接收端的直达波通道与回波通道间的相位不一致性导致形变反演精度差,甚至无法进行形变反演。为此,本文提出了一种利用喇叭天线背瓣的直达波成像结果相位对场景目标进行相位补偿,以消除接收机通道链路误差的方法。该方法主要利用喇叭天线背瓣信号与主瓣信号的链路一致性,通过提取原点成像结果相位,对场景目标进行补偿,消除通道间链路相位误差对干涉相位的影响。仿真结果表明通过该方法可以消除接收通道链路间的相位误差,实测数据同样验证了所提方法的有效性,为导航卫星差分干涉SAR的实际应用奠定了基础。更多还原

【Abstract】 Differential interferometric SAR using navigation satellite as external radiation source is a new type of earth observation method that has emerged in recent years.Due to the phase inconsistency between the heterodyne channel(HC) and the radar channel(RC) at the receiving end under long-term data acquisition,the deformation inversion accuracy is poor,and even the deformation inversion cannot be performed.Therefore,this paper proposes a method for phase compensation of the scene target using the direct wave imaging result of the horn antenna back lobes to eliminate the phase error between the receiver channels.The method mainly utilizes the link consistency between the back lobe signal of the horn antenna and the main lobe signal,then compensates the scene target by extracting the phase of the origin imaging result,eventually eliminates the influence of the link phase error between the channels on the interference phase.The simulation results show that the phase error between the receiving channel links can be eliminated by this method.The measured data also validates the effectiveness of the proposed method and lays a foundation for the practical application of the navigation satellite differential interferometric SAR.更多还原