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基于相移和相位滤波的面波压制方法（英文）.docx

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基于相移和相位滤波的面波压制方法（英文） Title:SurfaceWaveSuppressionMethodbasedonPhaseShiftandPhaseFiltering Abstract: Surfacewavesareundesirableastheycaninterferewithdesiredsignalsinvariousapplicationssuchasseismicexploration,groundpenetratingradar,andnon-destructivetesting.Thispaperproposesamethodforsuppressingsurfacewavesbasedonphaseshiftandphasefiltering.Themethodinvolvesmanipulatingthephaseofthereceivedsignalstoattenuateunwantedsurfacewavecomponentswhilepreservingthedesiredsignalinformation.Experimentalresultsdemonstratetheeffectivenessoftheproposedmethodinsuppressingsurfacewavesandimprovingthesignal-to-noiseratio. 1.Introduction Surfacewavesoftenposechallengesinsignalprocessingapplicationsthatrelyonaccuratedetectionandlocalizationofsubsurfacetargets.Thepresenceofsurfacewavescanobscureordistortimportantinformation,leadingtoreduceddetectionperformance.Traditionalmethodsforsurfacewavesuppressioninvolveutilizingtemporalorspatialfilteringtechniques.However,thesemethodscanalsoattenuateusefulsignalcomponents,limitingtheireffectiveness.Thispaperpresentsanovelapproachthatleveragesphaseshiftandphasefilteringtoselectivelysuppresssurfacewaveswhileretainingdesiredsignalinformation. 2.SurfaceWaveCharacteristics Beforediscussingtheproposedmethod,itisessentialtounderstandthecharacteristicsofsurfacewaves.Surfacewavestypicallypropagatealongtheboundarybetweentwomedia,suchasthegroundandair.Theyexhibitlowervelocitiescomparedtobulkwavesandaremoresusceptibletoattenuationanddispersion.Surfacewaveshavedistinctwaveformsandfrequenciesthatcanbeexploitedfortheirsuppression. 3.TheProposedMethod Theproposedmethodinvolvestwomainsteps:phaseshiftandphasefiltering.Inthephaseshiftstep,thereceivedsignalismodifiedbyintroducingacontrolledphaseshift.Thephaseshiftisdesignedtomanipulatethecoherentinterferencebetweenthedesiredsignalandthesurfacewavecomponents.Bycarefullyadjustingthephaseshift,thesurfacewavecomponentscanbeattenuated,whilethedesiredsignalremainsrelativelyunaffected. Inthephasefilteringstep,afrequency-depen