GEO星机双基SAR时间同步误差对运动目标检测的影响建模与分析  

The Impact Modeling and Analysis of Time Synchronization Error on Moving Target Indication for GEO Spaceborne-Airborne Bistatic SAR System

作　　者：崔畅 董锡超[1,2] 胡程 田卫明[1,2] CUI Chang;DONG Xichao;HU Cheng;TIAN Weiming(Radar Research Lab,School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401135,China;Key Laboratory of Electronic and Information Technology in Satellite Navigation(Beijing Institute of Technology),Ministry of Education,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院雷达技术研究所,北京100081 [2]北京理工大学重庆创新中心,重庆401135 [3]卫星导航电子信息技术教育部重点实验室(北京理工大学),北京100081

出　　处：《信号处理》2022年第1期74-82,共9页Journal of Signal Processing

基　　金：重庆市杰出青年科学基金项目(cstc2020jcyj-jqX0008);国家自然科学基金重点国际(地区)合作研究项目(61960206009);国家自然科学基金面上项目(61971039,61971037)。

摘　　要：地球同步轨道星机双基地合成孔径雷达(GEO SA-BSAR)系统是以GEO SAR发射,飞机装载多通道系统接收信号的双基地SAR系统,其可充分利用GEO平台提供的长时间稳定的波束覆盖特性,为运动目标的检测和监视提供了便利。但是,GEO SA-BSAR系统由于收发分离,不得不面临发射端和接收端的频率源差异导致的时间同步误差的问题,影响到动目标检测的性能。为了研究GEO SA-BSAR系统的时间同步误差对动目标检测性能的影响,本文对GEO SA-BSAR系统在时间同步误差影响下的多通道运动目标信号建模,并推导得到了动目标检测性能指标与时间同步误差之间的解析关系式。理论分析和仿真结果表明时间同步误差会导致目标的输出信噪比损失,并产生径向速度估计误差。Geosynchronous spaceborne-airborne bistatic synthetic aperture radar(GEO SA-BSAR)system has a GEO transmitter,and the aircraft is equipped with multi-channel antennas to receive signals.GEO can provide a long-term stable beam coverage,which is convenience for moving target detection and monitoring.However,the GEO SA-BSAR system uses different frequency source between transmitter and receiver,leading to a time synchronization error and the performance degradation of the moving target indication(MTI).In order to study the impact of time synchronization error on MTI performance in GEO SA-BSAR system,the multi-channel moving target signal under the influence of time synchronization error is modeled in this paper,and the relationship between MTI performance indicators and time synchronization error is deduced.The theoretical analysis and simulation results show that the time synchronization error will lead to the output SNR loss and the radial velocity estimation error of the target.

关 键 词：地球同步轨道 星机双基地合成孔径雷达 时间同步误差 动目标检测 

分 类 号：TN959.4[电子电信—信号与信息处理]