·48·兵工自动化OrdnanceIndustryAutomation2023-0642(6)doi:10.7690/bgzdh.2023.06.011基于改进重建滤波器组的机动目标MIMO-ISAR高分辨成像方法郭永辉,李云涛,张宇,何永华,李永刚(航天工程大学,北京101416)摘要:针对空间非均匀采样导致的方位向多普勒模糊问题,提出改进重建滤波器组的机动目标MIMO-ISAR高分辨成像方法。针对目标高机动模型,构建多载频线性调频信号的MIMO-ISAR回波模型,采用RWT(radon-wignertransform)参数估计目标运动参数,根据方位有效采样率构建滤波器组,通过实验验证该算法的有效性。结果表明,该方法能有效解决机动目标方位向多普勒模糊问题。关键词:Wigner-Ville分布;Radon变换;MIMO雷达;逆合成孔径雷达;滤波器组中图分类号:TJ06文献标志码:AHighResolutionMIMO-ISARImagingofManeuveringTargetsBasedonImprovedReconstructionFilterBankGuoYonghui,LiYuntao,ZhangYu,HeYonghua,LiYonggang(SpaceEngineeringUniversity,Beijing101416,China)Abstract:AimingattheproblemofazimuthDopplerambiguitycausedbyspatialnon-uniformsampling,animprovedreconstructionfilterbankbasedMIMO-ISARhighresolutionimagingmethodformaneuveringtargetsisproposed.Forthehighmaneuveringtargetmodel,theMIMO-ISARechomodelofmulti-carrierLFMsignalisconstructed,andthetargetmotionparametersareestimatedbyRWT(radon-Wignertransform)parameters,andthenthefilterbankisconstructedaccordingtotheeffectivesamplingrateofazimuth.Theeffectivenessofthealgorithmisverifiedbyexperiments.TheresultsshowthatthemethodcaneffectivelysolvetheproblemofazimuthDopplerambiguityofmaneuveringtarget.Keywords:Wigner-Villedistribution;Radontransform;MIMOradar;ISAR;filterbank0引言为更好地解译目标,ISAR图像的方位向分辨率要与距离向分辨率相当。在对非合作机动目标成像时,由于目标的速度和加速度都可能变化,造成横向的非均匀采样问题;因此,横向的非均匀采样是ISAR横向高分辨面临的问题之一。传统RD成像算法中,雷达发射信号的脉冲重复频率(pulserepetitionfrequency,PRF)预先设定,而距离多普勒(range-doppler,RD)成像算法要求PRF与目标速度满足关系PRF=2V(t)/(L•ΔRl)。当目标在相干积累时间内做高机动运动时,其速度急剧变化使PRF不匹配,因此成像过程中必然导致多普勒模糊。当前对ISAR多普勒模糊问题的研...