机动目标双基地ISAR越距离单元徙动校正算法  

Correction Algorithm of Migration Through Resolution Cells in Bistatic ISAR of Maneuvering Target

作　　者：郭宝锋[1,2] 尚朝轩[1] 高梅国[2] 王俊岭[2] 姜洪伟[2] 

机构地区：[1]军械工程学院电子与光学工程系,石家庄050003 [2]北京理工大学雷达技术研究所,北京100081

出　　处：《数据采集与处理》2014年第4期562-569,共8页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(51107147)资助项目

摘　　要：逆合成孔径雷达(Inverse synthetic aperture radar,ISAR)使用距离多普勒算法成像时,当目标尺寸较大或转角过大,会发生越距离单元徙动(Migration through resolution cells,MTRC)现象,严重影响目标成像效果。基于双基地ISAR转台模型,针对成像的MTRC问题,对解线频调后的目标回波进行研究,分析了机动目标MTRC的产生机理,并将匹配傅里叶变换(Match Fourier transform,MFT)应用到MTRC的校正中,消除了快时间频率与慢时间的耦合项,有效解决了MTRC引起的ISAR图像散焦问题。仿真结果表明,基于MFT的双基地ISAR MTRC校正算法能够有效校正机动目标的距离徙动,提高ISAR成像质量。When the size of target is big or the rotation angle is big,migration through resolution cells （MTRC） may occur when employing range-Doppler imaging algorithm in inverse synthetic aperture radar （ISAR）,which can affect the imaging quality.Aiming at the problem of MTRC,the echo after dechirping is researched based on bistatic ISAR turntable model.And the cause of MTRC is analyzed.The match Fourier transform （MFT） is used to correct MTRC,which can eliminate the coupling of fast frequency,slow time and solve the image defocusing problem caused by MTRC.Simulation result shows that the correction algorithm based on MFT can correct the MTRC of maneuvering target and improve the image quality.

关 键 词：逆合成孔径雷达 双基地 机动目标 越距离单元徙动 匹配傅里叶变换 

分 类 号：TN957[电子电信—信号与信息处理]