Cycle slip detection and repair for undifferenced GPS observations under high ionospheric activity

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1、GPSSolutDOI10.1007/s10291-012-0275-7ORIGINALARTICLECycleslipdetectionandrepairforundifferencedGPSobservationsunderhighionosphericactivityChangshengCai•ZhizhaoLiu•PengfeiXia•WujiaoDaiReceived:23October2011/Accepted:12June2012ÓSpringer-Verlag2012AbstractWedev

2、elopanewapproachforcycleslipdetec-windowaveraging
Second-order
Time-differencephasetionandrepairunderhighionosphericactivityusingundif-ionosphericresidualferenceddual-frequencyGPScarrierphaseobservations.Aforwardandbackwardmovingwindowaveraging(FBMWA)algori

3、thmandasecond-order,time-differencephaseiono-Introductionsphericresidual(STPIR)algorithmareintegratedtojointlydetectandrepaircycleslips.TheFBMWAalgorithmispro-Inthepastdecade,preciseGlobalNavigationSatelliteposedtodetectcycleslipsfromthewidelaneambiguityofS

4、ystem(GNSS)applicationsbasedonasingledual-MelbourneWu¨bbenalinearcombinationobservable.Thefrequencyreceiverhavebecomeincreasinglypopular.FBMWAalgorithmhastheadvantageofreducingthenoisePrecisepointpositioning(PPP)isatypicaltechniquethatlevelofwidelaneambigui

5、ties,eveniftheGPSdatausesonlyoneGNSSreceivertoachievedecimeterorevenareobservedunderrapidionosphericvariations.Thus,thecentimeterhighprecisionpositioningsolutions(Zumbergedetectionofslipsofonecyclebecomespossible.TheSTPIRetal.1997;KoubaandHe´roux2001).Inthe

6、PPPapplica-algorithmcanbetterremovethetrendcomponentofiono-tions,akeylimitationisthelongambiguityconvergencesphericvariationscomparedtothenormallyusedfirst-order,time,typicallyabout30minundernormalGNSSobser-time-differencephaseionosphericresidualmethod.Theva

7、tionconditions(BisnathandGao2008).Thus,itishighlycombinationofSTPIRandFBMWAalgorithmscanuniquelydesiredthattheGNSScarrierphasesignalsbecontinuouslydeterminethecycleslipsatbothGPSL1andL2frequencies.tracked,ensuringcontinuousdeliveryofhighprecisionPPPThepropo

8、sedapproachhasbeentestedusingdatacollectedsolutionsaslongastheinitialambiguitiesareresolvedatunderdifferentlevelsofionosphericactivitieswithsimulatedthebeginning.AnydiscontinuitiesinGNSScarrierphasecyc