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COMPARISONOFGEOMETRY-BASEDDOPPLERAMBIGUITYRESOLVERINSQUINTSAR
&
WenchaoLiUniversityofElectronicScienceandTechnologyofChinaANINDIRECTDOPPLERRATEESTIMATIONSCHEMEOFSARINLOW-CONTRASTSCENE
COMPARISONOFGEOMETRY-BASEDDIntroductionSyntheticApertureRadar(SAR)Animportantremotesensingtool.MonostaticSARBistaticSARStripmapSARScanSARSpotlightSARSide-lookingSARSquint-lookingSAR……IntroductionSyntheticApertureIntroductionSquintSARGeometrymodelSquintangleIntroductionSquintSARGeometryIntroductionSquintSARRangeHistory：ThelineartermisrangewalkThequadratictermisrangecurvature
IntroductionSquintSARRangeHiIntroductionDopplercentroid()Dopplerrate()Afterrangewalkcorrection,theazimuthdatacanbemodeledasalinearfrequencymodulated(LFM)signal,SignalmodelIntroductionAfterrangewalkcIntroductionInprinciple,itispossibletocomputeDopplerparameterfrompriorinformationprovidedbyGPS/INS,butmeasurementuncertaintiesontheinformationwilllimittheaccuracy.IntroductionInprinciple,itiIntroductionAnincorrectDopplercentroid
alossofSNR;anincreaseintheazimuthambiguitylevel;ashiftinthelocationofthetarget;…...
IncorrectDopplerrateCorrectDopplerrateAnincorrectDopplerratewouldblurtheimage.IntroductionAnincorrectDopplIntroductionTherefore,DopplerparameterEstimationfromechodataisanessentialprocedureforhighqualitySARprocessingIntroductionTherefore,DopplerDopplercentroidestimation(ResolveDopplercentroidambiguity)DopplercentroidestimationDopplercentroidestimationAsazimuthdataaresampledbypulserepetitionfrequency(PRF),thereisalwaysDopplercentroidambiguity,andthebiggerthesquintangleis,themoreseriousthedopplerambiguitywillbe.Dopplercentroidisusuallyexpressedintwoparts:thebasebandDopplercentroidandDopplerambiguitynumber.DopplercentroidestimationAsDopplercentroidestimationMultiplePRFWavelengthdiversityalgorithm(WDA)Multilookalgorithms(MLCC,MLBF)
Geometry-basedalgorithmsDopplercentroidestimationMuGeometry-basedalgorithmsTherelationshipbetweenDopplercentroidandrangewalkslope,Sincethismethodisbasedonthegeometriccharacteristicsoftherangecompresseddata,itisnamedasageometry-basedDopplerambiguityresolver.ThenDopplercentroidcanbecomputedviaestimatingtherangewalkslope.Geometry-basedalgorithmsTherConventionalRadontransformschemeRadontransform:Awell-knowntoolfordetectingslope.
Itintegratesintensityalongeverypossibledirectionintheimageandmapsthisinformationintoafeaturespace.Itinvolvestwo-dimensionalsearch.Geometry-basedalgorithmsConventionalRadontransformsIterativeschemeTheslopeisseenasasearchingvariable,andentropyisusedtomeasuretherobustnessofsignal.Itutilizesthepriorinformationofplatform,andreplacestheRadontransformwithasimpleintegrationofimageintensityoverazimuth.Geometry-basedalgorithmsIterativeschemeTheslopeissImprovedRadontransformschemeThisschemeutilizespriorinformationofplatform,convertthedataintobinarydata,andconducttwo-stepRadontransform,whichwouldmakeitissparseandreducetheneedtosearchthewholefeaturespace.Geometry-basedalgorithmsImprovedRadontransformschemComparisonsItisobviouslythattheycangivetheaccurateDopplerambiguitynumber.WhilethespeedoftheiterativeschemeandtheimprovedRadontransformschemeismuchfasterthanconventionalRadontransform.ComparisonsItisobviouslythaDopplerrateestimation(Autofocus)DopplerrateestimationParametricMethodMetric-basedAutofocus(Entropy/Contrast)MapDrift(MD)Shiftandcorrelate(SAC)DopplerrateestimationNonparametricMethodProminentPointProcessing(PPP)PhaseGradientAutofocus(PGA)Time-FrequencyAnalysisHighcontrastscene.ParametricMethodDopplerrateLowcontrastsceneLowSNRWithoutprominentpoint
Whatcanwedo?DopplerrateestimationLowcontrastsceneDopplerrateEstimationSchemeAccordingtothefactthatDopplerrateisinverselyproportionaltorange,
ItindicatesthattheDopplerrateinlow-contrastscenecanbeestimatedindirectly.EstimationSchemeAccordingtoEstimationFlowchartDopplerrateinhigh-contrastsceneisestimatedfirstusingRadon-Wignertransform,andthenusingthefactthatDopplerrateisinverselyproportionaltorange,Dopplerrateinlow-contrastsceneisestimatedindirectly.EstimationFlowchartDopplerraResultsHighContrastScene
WithProminentPoint
Timefrequencyanalysis
RadontransformLowContrastScene
WithoutProminentPointTimefrequencyanalysis
RadontransformResultsHighContrastSceneConclusions
Thegeometry-basedschemecanbeusedtoresolveDopplerambiguityofSARwithlargemigration.ThespeedofimprovedRadontransformschemeandtheiterativeschemeisabouttentimesfasterthanconventionalRadontransformscheme.AnindirectestimationschemeofDopplerrateforlowcontrastsceneisdeveloped.Theindirectschemeiseffective,anditcanreducecomputationtimegreatly.ConclusionsThegeometry-baseThankyouforyourlistening!Thankyouforyourlistening!COMPARISONOFGEOMETRY-BASEDDOPPLERAMBIGUITYRESOLVERINSQUINTSAR
&
WenchaoLiUniversityofElectronicScienceandTechnologyofChinaANINDIRECTDOPPLERRATEESTIMATIONSCHEMEOFSARINLOW-CONTRASTSCENE
COMPARISONOFGEOMETRY-BASEDDIntroductionSyntheticApertureRadar(SAR)Animportantremotesensingtool.MonostaticSARBistaticSARStripmapSARScanSARSpotlightSARSide-lookingSARSquint-lookingSAR……IntroductionSyntheticApertureIntroductionSquintSARGeometrymodelSquintangleIntroductionSquintSARGeometryIntroductionSquintSARRangeHistory：ThelineartermisrangewalkThequadratictermisrangecurvature
IntroductionSquintSARRangeHiIntroductionDopplercentroid()Dopplerrate()Afterrangewalkcorrection,theazimuthdatacanbemodeledasalinearfrequencymodulated(LFM)signal,SignalmodelIntroductionAfterrangewalkcIntroductionInprinciple,itispossibletocomputeDopplerparameterfrompriorinformationprovidedbyGPS/INS,butmeasurementuncertaintiesontheinformationwilllimittheaccuracy.IntroductionInprinciple,itiIntroductionAnincorrectDopplercentroid
alossofSNR;anincreaseintheazimuthambiguitylevel;ashiftinthelocationofthetarget;…...
IncorrectDopplerrateCorrectDopplerrateAnincorrectDopplerratewouldblurtheimage.IntroductionAnincorrectDopplIntroductionTherefore,DopplerparameterEstimationfromechodataisanessentialprocedureforhighqualitySARprocessingIntroductionTherefore,DopplerDopplercentroidestimation(ResolveDopplercentroidambiguity)DopplercentroidestimationDopplercentroidestimationAsazimuthdataaresampledbypulserepetitionfrequency(PRF),thereisalwaysDopplercentroidambiguity,andthebiggerthesquintangleis,themoreseriousthedopplerambiguitywillbe.Dopplercentroidisusuallyexpressedintwoparts:thebasebandDopplercentroidandDopplerambiguitynumber.DopplercentroidestimationAsDopplercentroidestimationMultiplePRFWavelengthdiversityalgorithm(WDA)Multilookalgorithms(MLCC,MLBF)
Geometry-basedalgorithmsDopplercentroidestimationMuGeometry-basedalgorithmsTherelationshipbetweenDopplercentroidandrangewalkslope,Sincethismethodisbasedonthegeometriccharacteristicsoftherangecompresseddata,itisnamedasageometry-basedDopplerambiguityresolver.ThenDopplercentroidcanbecomputedviaestimatingtherangewalkslope.Geometry-basedalgorithmsTherConventionalRadontransformschemeRadontransform:Awell-knowntoolfordetectingslope.
Itintegratesintensityalongeverypossibledirectionintheimageandmapsthisinformationintoafeaturespace.Itinvolvestwo-dimensionalsearch.Geometry-basedalgorithmsConventionalRadontransformsIterativeschemeTheslopeisseenasasearchingvariable,andentropyisusedtomeasuretherobustnessofsignal.Itutilizesthepriorinformationofplatform,andreplacestheRadontransformwithasimpleintegrationofimageintensityoverazimuth.Geometry-basedalgorithmsIterativeschemeTheslopeissImprovedRadontransformschemeThisschemeutilizespriorinformationofplatform,convertthedataintobinarydata,andconducttwo-stepRadontransform,whichwouldmakeitissparseandreducetheneedtosearchthewholefeaturespace.Geometry-basedalgorithmsImprovedRadontransformschemComparisonsItisobviouslythattheycangivetheaccurateDopplerambiguitynumber.WhilethespeedoftheiterativeschemeandtheimprovedRadontransformschemeismuchfasterthanconventionalRadontransform.ComparisonsItisobviouslythaDopplerrateestimation(Autofocus)DopplerrateestimationParametricMethodMetric-basedAutofocus(Entropy/Contrast)MapDrift(MD)Shiftandcorrelate(SAC)DopplerrateestimationNonparametricMethodProminentPointProcessing(PPP)PhaseGradientAutofocus(PGA)Time-FrequencyAnalysisHighcontrastscene.ParametricMethodDopplerrateLowcontrastsceneLowSNRWithoutprominentpoint
Whatcanwedo?DopplerrateestimationLowcontrastsceneDopplerrateEstimationSchemeAccordingtothefactthatDopplerrateisinverselyproportionaltorange,
ItindicatesthattheDopplerrateinlow-contrastscenecanbee
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