Joint Time-Frequency Interpretation of Scattering

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1、IEEETRANSACTIONSONANTENNASANDPROPAGATION,VOL.45,NO.8,AUGUST19971259JointTime-FrequencyInterpretationofScatteringPhenomenologyinDielectric-CoatedWiresCanerOzdemirandHaoLing,SeniorMember,IEEEAbstractÐThescatteringphenomenologyindielectric-coatedandthecompar

2、isonbetweenthemeasurementandsimu-wirestructureisinvestigatedusingthejointtime-frequencylationdataarepresentedinSectionII.InSectionIII,theprocessingofsimulatedandmeasurementdata.Themethodofshort-timeFouriertransform(STFT)techniqueisusedtomomentsisappliedto

3、carryoutthesimulation.Thecomputedextractpertinentscatteringphysicsofthestructure.Thedom-resultsarecomparedtomeasureddatainboththefrequencyandtimedomains.Thescatteringdataarenextanalyzedinthejointinantsurfacewave,ortheso-calledGoubaumode[11],time-frequency

4、planebyusingtheshort-timeFouriertransformisexcitedduetothedielectriccoatingaroundthewire.(STFT)techniquetoprovidefurtherinsightintothescatteringThefeaturesofthismodearestudiedandtheinterpreta-phenomenology.ThedispersiveGoubaumodeexcitedalongthetionofthedi

5、spersivebehaviorisgiveninthejointtime-coatedwirecanbeclearlyobservedinthejointtime-frequencyfrequencyplanewiththeaidoftheSTFTtechnique.Inplane.Inaddition,thetime-frequencydistributionseries,whichimprovestheresolutionoftheSTFTwhileovercomingthecross-Sectio

6、nIV,wefurtherexploremethodstogainbetterreso-terminterferenceproblemoftheWigner±Villedistribution,islutioninthejointtime-frequencyplane.OnecommonmethodappliedtobetteridentifybackscatteringreturnsthataredifficulttoachievebetterresolutioniswiththeWigner±Ville

7、distri-toresolveinthejointtime-frequencyplane.bution(WVD).However,itiswellknownthatcross-termIndexTermsÐElectromagneticscattering.interferenceoccursbetweenanypairofautotermsinthejoint-timefrequencyplane.TosuppressthecrosstermsintheWVD,therecentlydeveloped

8、time-frequencydistributionI.INTRODUCTIONseries(TFDSÐalsoknownastheGaborspectrogram)[12],HEanalysisofelectromagneticradiationandscatteringwhichistheWVDoftheGaborexpansionoftheoriginalTfromdielectric-coatedwirestructu