single epoch gps deformation signals extraction and gross error detection technique based on wavelet transform

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1、SingleEpochGPSDeformationSignalsExtractionandGrossErrorDetectionTechniqueBasedonWaveletTransformGeo-spatialInformationScience(Quarterly)Volume9,Issue3September2006ArticleID:1009—5020(2006)03—187—04Documentcode:ASingleEpochGPSDeformationSignalsExtractionandGrossErrorDetectionTechniqueBased

2、onWaveletTransformWANGJianGAOJingxiangXUChanghuiABSTRACTWavelettheoryisefficientasanadequatetoolforanalyzingsingleepochGPSdeformationsigna1.Waveletanalysistechniqueongrosserrordetectionandrecoveryisadvanced.Criteriaofwaveletfunctionchoo—singandMallatdecompositionlevelsdecisionarediscussed

3、.Aneffectivedeformationsignalextractingmethodisproposed,thatiswaveletnoisereductiontechniqueconsideringgrosserrorrecovery,whichcombineswave—letmulti—resolutiongrosserrordetectionresults.Timepositionrecognizingofgrosserrorsandtheirrepairingperformancearerealized.Intheexperiment,compactlysu

4、pportedorthogonalwaveletwithshortsupportblockismoreefficientthanthelongeronewhendiscerninggrosserrors,whichcanobtainmorefinelyanalyses.Andtheshapeofdiscernedgrosserrorofshortsupportwaveletissimplerthanthatofthelongerone.Meanwhile,thetimescaleiseasiertoidentify.KEYWORDSnoise;singleepochGPS

5、deformationsignal;Mallatalgorithm;grosserrordetection;grosser—rorrecoveryCLCNUMBERP228.42:P207IntroductionGPStechniqueiswidelyusedfordeformationmonitoringthanksforthehighprecision.Usual—ly,therearethreeworkingmodesassociatedwithGPSdeformationobservation:periodicalGPSdeformationmonitoringn

6、et,GPSmonito-ringarrayandreal?.timeGPSdeformationmoni?.toringtechnique[.Thereal—timeGPSdeforma—tionmonitoringtechniqueisapplicabletode—formationbodythatownfastdeformationfea-ture,fiercetendencychangeorsaltationcharac—teristies.SingleepochGPSschemecangetmorecrediblereal—timedeformationinfo

7、rmationinaidofdeformationcontro1.WhereashighfrequencysingleepochGPSdeformationsignalisaffectedbyvariousfactorssuchunstabletroposphere,assignalinterruption,multi—patheffectsandstrongelectromagneticfield,whichresultsinalotofnoisesandsomegrosserrorsinthede—formationsig