ULTRA-TIGHTLY COUPLED GPS INS TRACKING PERFORMANCE

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1、AIAA's3rdAnnualAviationTechnology,Integration,andOperations(ATIO)TechAIAA2003-681517-19November2003,Denver,ColoradoULTRA-TIGHTLYCOUPLEDGPS/INSTRACKINGPERFORMANCEDavidE.LewisRaytheonCompany,ElSegundo,CAAbstractinterferingsignalcanpreventcommercialGPSrece

2、iveracquisitionandtrackingatsignificantdistancesawayThispaperpresentstheresultsofimprovementsinthefromtheinterferencesource.A0.1wattinterferingGPSreceivertrackingperformancewhenUltra-tightlysignalcoupledwithanInertialMeasurementUnit.Inatightlycoupledsys

3、temIandQdataareinputtotraditional120.0fixedgaintrackingloops.ResidualsarethenformedbetweentheLOSprojectednavigationsolutionandthe100.0trackingloopoutputs.HighrateIMUinputsare10KWconvertedtolineofsightaidingviathenavigationJammer80.0function,inordertored

4、ucetrackingloopbandwidths1KWJammerandprovidealeveloftrackingstability.InanUltra-(dB)100WJam60.0mernputtightlycoupledsystemthetrackingloopblockisIa10WJnnC/ACodeTrackingammereplacedbyanIntegrateandDump(I&D)processingte(Ultra-TightlyCoupledAiding)rJamtAnme

5、rblock.Bothrangeandrangerateresidualsareformed40.0/SaJC/ACodeTracking0.1W(TightlyCoupledAiding)JammedirectlywiththeI&Dblock,producinguncorrelatedrmeasurementsintotheKalmanFilter.TheNavigation20.0C/ACodeAcquisitionKalmanFilternow“playstherole”oftheloopfi

6、lterindirectlystabilizingtrackingerrors.Additionalstatesare0.01.010.0100.01000.0addedintheKalmanFilterforIMUandoscillatorRangetoInterferer(km)performance.Thistechniquereducestheeffectivebandwidthofthetrackingloop,whichresultsinhighertrackingperformance.

7、TheeffectsofIMUandoscillatorFigure1GPSReceiverPerformancequalitywerealsostudiedandplayadirectroleinversusJ/Sreceivertrackingperformanceandnavigationaccuracyinbothtightlycoupledandultra-tightlycoupledsystems.over5milesawaycanpreventGPSreceivertracking.Re

8、sultspresentedinthispaperwerecollectedfrombothThispaperaddressesacarrierandcodetracingaidingahighfidelityC-modelsimulationofatightlycoupledtechniquethatsignificantlyimprovesthetrackingandanUltra-tightlycouplednavigationreceiveran