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方位多通道SAR通道误差校正研究.docx

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方位多通道SAR通道误差校正研究 Abstract: Thispaperaimstoexplorethechannelerrorscalibrationinmultichannelsyntheticapertureradar(SAR)systems.Channelerrorsoccurduetovariousfactorssuchaselectronicnoise,componentmismatch,andantennapatterndeviation.Theseerrorscancausedistortionsinthereceivedsignal,resultinginimagedegradationandreducedaccuracyintargetdetectionandclassification.Therefore,accurateandefficientcalibrationtechniquesarevitaltoimprovetheperformanceofmultichannelSARsystems.Thispaperconductsanin-depthstudyoftheexistingchannelerrorcalibrationmethodsandproposesanovelcalibrationalgorithmbasedonadaptivefilteringandleastsquaresestimation.TheproposedmethodisevaluatedusingsimulatedSARdata,andtheresultsdemonstrateitsfeasibilityandeffectivenessinmitigatingchannelerrors. 1.Introduction Syntheticapertureradar(SAR)isaremotesensingtechnologythatutilizestheDopplershiftofradarechoesreflectedfromascenetoconstructhigh-resolutionimages.MultichannelSARsystemshavebecomeincreasinglypopularduetotheircapabilityofprovidingadditionalinformationandimprovingthequalityofSARimages.However,theperformanceofmultichannelSARsystemscanbesignificantlyaffectedbychannelerrors.Channelerrorsarisefromimperfectionsinthehardware,suchasmismatchesbetweenchannels,antennapatterndeviations,andelectronicnoise.ToachieveaccurateSARimagereconstruction,thesechannelerrorsneedtobeaccuratelycalibrated. 2.ExistingChannelErrorCalibrationMethods Variouschannelerrorcalibrationmethodshavebeenproposedintheliterature.Thesemethodscanbebroadlycategorizedintotwotypes:pre-flightcalibrationandin-flightcalibration.Pre-flightcalibrationaimstocharacterizeandcorrectthechannelerrorsbeforetheSARsystemisdeployed.In-flightcalibration,ontheotherhand,iscarriedoutduringSARdataacquisitionandaimstoestimateandcorrectthechannelerrorsinrealtime. 2.1Pre-flightCalibrationMethods Pre-flightcalibrationmethodsrequireaccurateknowledgeofthesystem'shardwareandcaninvolveextensivemeasurementsandmodeling.Somecommonlyusedpre-flightcalibrationmethodsincludepolarizationcalib