预览加载中，请您耐心等待几秒...

频率步进雷达ISAR成像包络对齐新方法.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

频率步进雷达ISAR成像包络对齐新方法 摘要： 频率步进雷达逆合成孔径雷达（ISAR）成像技术已经成为海上、空中和地面目标识别的重要手段之一。然而，在ISAR成像中，由于复杂的目标运动导致成像包络没有对齐，进一步影响成像质量。本文提出了一种新的ISAR成像包络对齐方法，通过分析目标运动规律，利用频率步进采集的数据来实现包络对齐，并通过实验证明了该方法的可行性和有效性。 关键字：ISAR；频率步进雷达；成像包络对齐。 Introduction: InverseSyntheticApertureRadar(ISAR)imagingtechnologybasedonFrequencyStepRadarhasbecomeanimportantmeansoftargetrecognitiononland,seaandair.Targetmotionintheimagingprocess,however,canleadtomisalignedimagingenvelopesthatmayfurtheraffectimagingquality.Inthispaper,anewmethodisproposedforaligningimagingenvelopesinISARimaging,throughanalysisofthetarget'smotionandutilizationoffrequency-steppeddataacquisitiontoachieveenvelopealignment.Experimentalresultsdemonstratethefeasibilityandeffectivenessofthismethod. Keywords:ISAR,FrequencyStepRadar,ImagingEnvelopeAlignment. ISARImagingPrinciples: ISARimagingutilizesthemovementoftheradarplatformortargettoobtainalargeamountofdataaccordingtodifferentangles,andthenusessignalprocessingmethodstosynthesizeahigh-resolutionimage.Theradarreceivestheechosignalsthatarereflectedbytheobject,andthefrequencymodulationsignalemittedbytheradarperiodicallyvariestoachieverangecompression.TheDopplereffectcausedbytheobject'smotionthenproducesachangeinthefrequencyofthereflectedsignal,allowingforinformationabouttheobject'svelocityandorientationtobeextractedfromthesignals.Thedatathusobtainedcanbeusedtogenerateahigh-resolutionimageoftheobjectinthespatialdomainorfrequencydomain. ISARImagingEnvelopeAlignmentFactors: TheimagingenvelopeisakeyfactorindeterminingthequalityofISARimaging.Amisalignedimagingenvelopecanleadtopoorimageresolution,poorcontrast,andaconfusinginterpretationofthetarget'sshape.Themainfactorsthatcausemisalignedimagingenvelopesaretargetrotation,platformmotion,andanyvibrationoftheimagingsystem. NewMethodforISARImagingEnvelopeAlignment: Theproposedmethodutilizesthefrequency-stepdataacquisitionmodeoftheradar,toacquiredataatdifferentfrequenciesduringtherotationofthetarget.Thecollecteddataisprocessed,toobtainthefrequencyspectrumofth