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1、WeightedRAIMforPrecisionApproachToddWalterandPerEngeStanfordUniversityAbstractcollectedfromStanfordUniversity’swide-areadifferentialGPSnetwork.TheuseofdifferentialGPSisbecomingincreasinglypopularforreal-timenavigationsystems.Asthesesystemsmigratetosaf

2、ety-of-lifeapplications(e.g.1.0Introductionprecisionapproachandlanding),theirintegritybecomesmoreimportantthantheiraccuracy.OnemethodforTheuseofdifferentialGPSinasafety-of-lifeincreasingbothaccuracyandintegrityistheuseofapplication,suchasprecisionappr

3、oach,requiresthattheweightinginthenavigationsolution.Thismethodusesasystemprovideaccuratenavigationalinformationwithaprioriinformationtoweightcertainsatellites(e.g.thosehighdegreeofintegrity.Anypotentiallyhazardousorathigherelevation)overothersatellit

4、es.Theaccuracymisleadingpieceofinformationmustbeflaggedassuch,increasesbecausewebetterusetheinformationavailable.beforeitleadstoapositioningerror.ThemostrobustTheintegrityincreasesbecausesatellitesthataremorewaytoensurethattheinformationisvalidistohav

5、ealikelytointroduceerrorcontributelesstothesolution.multi-layerseriesofcheckswithasmuchindependencebetweenthelayersaspossible.IdeallythevalidityoftheAweightedpositionsolutionbyitselfdoesnotcorrectionswouldbeverifiedbothonthegroundandinprovidesufficien

6、tintegritytosupportprecisionapproach.theair.ReceiverAutonomousIntegrityMonitoringHowever,thismethodcanbecombinedwithaweighted(RAIM)isonepossiblemethodtocheckthevalidityofformofReceiverAutonomousIntegrityMonitoringthecorrectionsintheair.(RAIM)toincreas

7、ethelevelofintegrity.RAIMusesredundantmeasurementstochecktheconsistencyofanRAIMisasimpleyetpowerfultechniquetooverdeterminedsolution.Thischeckiscrucialbecausechecktheconsistencyofthenavigationsolution.Thisonlyausercandetectcertainerrortypes(e.g.severe

8、paperpresentstheweightedformofRAIMandhowitcanairframemultipathorlocalinterference).Adifferentialbeappliedtoprecisionapproach.Specifically,wewillreferencestationcandetectmanytypesoferrors.concentrateonCategoryIprecisionapproachaswillbeHowever,i