幅相误差对多发多收模式SAR成像影响分析  

Theoretical Analysis on Effects of Amplitude-Phase Error and Antenna Position Error on Multiple Transmit-Receive SAR Imaging

作　　者：李舆坤 洪峻[1,2] 明峰[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]微波成像技术国家重点实验室,北京100190 [3]中国科学院大学,北京100049

出　　处：《雷达科学与技术》2017年第6期571-579,592,共10页Radar Science and Technology

基　　金：国家高分对地观测重大专项(No.GFZX0403220401)

摘　　要：方位多通道SAR系统采用数字波束形成技术(Digital Beam-Forming,DBF),有效解决了高分辨率与大测绘带之间的矛盾,实现了高分辨率、宽测绘带对地观测,多发多收模式是方位多通道SAR未来的发展方向。建立了通道幅相特性误差和天线相位中心误差两类误差影响下的回波幅相误差模型,通过对方位向信号脉冲压缩的数学推导,求出了多发多收模式下回波信号的假目标位置和峰值-假目标比的解析表达式,从理论上分析了以上两类误差对该系统成像性能的影响。通过点目标成像仿真,验证了公式的正确性,得出了各类成像性能指标随各类误差变化的曲线。Incorporated with digital beam-forming（DBF）techniques,the multi-channel spaceborne SAR system are able to overcome the contradiction between high resolution and wide swath and yield high resolution and wide swath（HRWS）images.The multiple transmit-receive mode is promising.In this paper,we build the echo model in which two kinds of channel errors,channel gain-phase error and antenna position error,are incorporated.By calculating the result of compression on the mismatched multi-channel azimuth signals,we get the analytical formulas of peek-to-ghost-ratio（PGR）under multiple transmit-receive mode.Then we can analyze the effects of these errors on imaging.Simulation validates the correctness of the formulas and also gives the curves which describe the relation of the imaging performance and these errors.

关 键 词：多发多收 合成孔径雷达 方位多通道 相位中心误差 

分 类 号：TN958[电子电信—信号与信息处理]