等离子鞘套包覆临近空间高速日标逆合成孔径雷达成像方法

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关键词：等离子鞘套；空间高速目标；逆合成孔径雷达；CEEMDAN去噪；分数阶傅里叶变换；ISAR成像中图分类号：TN955-34 文献标识码：A 文章编号：1004-373X（2026）07-0040-08

Inverse synthetic aperture radar imaging method for near-space high-speed targets enveloped by plasma sheaths

HU Jie，XIE Yaocong，HUO Changyu （Qingdao Universityof Technology，Qingdao ， China）

Abstract：In the processof ISAR （inverse syntheticapertureradar）imaging for high-speed space targets enveloped by plasmasheaths，thevelocity-inducedradarechointra-pulsemovementcancausedistance-dimensional defocusinthe ISAR imagingresults.Inviewofthis，thepaperinvestigatesthereflectioncharacteristicsoftheplasmasheathandthevelocityfield distribution，establishesanchomodelforhig-speedtargetsenvelopedbyplasmasheaths，andrevealsthemechansmbywhich theplasmasheath flowfieldcausesdistance-dimensionaldefocusoftheISARimagingofahigh-spedspace target.Amulticomponent linear frequencymodulation parameter estimation method based on CEEMDAN （complete ensemble empirical mode decompositionwithadaptivenoise）andFRFT（fractionalFouriertransform）isproposedtoobtainthevelocityparametersof the plasmaflowfieldatdiferentpositionsofthetargetsurface.Amatchedfilteringalgorithmwithavelocitycompensationfactoris designedonthebasisof theplasmaflowfieldvelocity toachieveISARimagingforargetsenvelopedbyplasmasheaths.Simulation resultsvalidatetattheproposedmethodisefectiveandcarealiztheISARimagingdistance-dimensionaldefocusingsuppion in the case of the plasma sheath envelope.

Keywords：plasma sheath; space high-speed target; ISAR; CEEMDAN denoising; FRFT; ISAR imaging

0 引言

随着现代雷达成像技术的发展，逆合成孔径雷达（InverseSyntheticApertureRadar，ISAR）成像已成为一种重要的目标识别手段，在军事和民用领域都有着广泛的应用[1-3]。（剩余8675字）