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1、AnalysisofanUltra-TightlyCoupledGPS/INSSysteminJammingErnestJ.OhlmeyerNavalSurfaceWarfareCenterDahlgrenDivision17320DahlgrenRoadDahlgren,VA,USAAbstract–TheperformanceofanUltra-TightlyCoupledPRNcodealignedwiththereceivedcode,andtoalignthe(UTC)GlobalPositioningSy
2、stem/InertialNavigationSystemoscillatorfrequencywiththereceivedfrequency.Whenin(GPS/INS)isevaluatedusingasystemsimulationoftheGPSlock,thetrackingloopsidentifytheline-of-sightrangeandreceiverandnavigationprocessing.TheUTCsystembeingrangeratetoeachsatellite,which
3、arecorruptedbyreceiveranalyzedusesabankofpre-filterstoestimatecodedelayerrorclockbiasanddrifterrors,amongothers.ThesepseudorangeandDopplerfrequencyerrorforeachsatellite.Theseoutputsare(PR)anddelta-range(DR)measurementsareprovidedtothesenttoacentralKalmannavigat
4、ionfilter.Thiscentralprocessorgeneratesestimatesofinertialnavigationposition,velocity,andnavigationprocessor,whichusesthemtoassisttheINSinattitudeerrors;IMUbiases;anduserclockerrors,whicharedeterminingthevehiclepositionandvelocity.Acharacteristicusedtocorrectth
5、enavigationsolution.IntheUTCapproach,ofthisarchitectureisthatthetrackingloopsoperateoutputsfromthecentralnavigationprocessor,afterprojectionautonomouslyandsendfeedbacktotheNCOswithoutanyintosatelliteline-of-sightcoordinates,areusedtocontroltheaidinginformationf
6、romthenavigationprocessor.Oneeffectcodeandcarrierreplicasignalsforeachsatellitechannel.Inofthisdecouplingisthattheabilityoftheloopstomaintaincontrast,aconventionaltightlycoupledGPS/INSsystemusestrackishighlysensitivetonoiseandvehicledynamics.separatetrackingloo
7、psforeachsatellitechannel,whichoperateInrecentyears,severalnewmethodsforintegratingtheautonomously.Asaresult,theUTCdesignisconsideredmoreGPS/INShavebeenproposed[4-7].Theapproachconsideredrobusttojammingandvehicledynamics.Closed-loopUTCnavigationperformanceiseva
8、luatedoverarealisticprecisioninthispaperisbasedon[7]andiscalled“ultra-tightlyguidedmunition(PGM)scenariointhepresenceofbroadbandcoupled”GPS/INS,orUTCforshort.Thekeyfeatureso
