gnss软件接收机中室内微弱卫星信号捕获技术的分析-analysis of indoor weak satellite signal acquisition technology in gnss software receiver.docx

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2018-06-04 发布于上海
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gnss软件接收机中室内微弱卫星信号捕获技术的分析-analysis of indoor weak satellite signal acquisition technology in gnss software receiver.docx

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gnss软件接收机中室内微弱卫星信号捕获技术的分析-analysis of indoor weak satellite signal acquisition technology in gnss software receiver

ABSTRACTWiththedevelopmentofmoderninformationtechnology,satellitenavigation technologyhasbeenwidelyappliedtopeople’slife.Thediversitynavigationapplication environmentrequireGNSSnavigationreceiverwithhigh-performance, suchashigh sensitivityhigh dynamicandmulti-constellationcompatible and so on.High sensitivityis animportantindicatorforGNSSsoftwarereceiver,whichreflectsGNSSsoftware receiver’scapabilitiesfortheweaksatellitesignalprocessing.Inthispaper,westudy indoorweaksignalcharacteristicsandproposedanimprovedcircularcorrelation algorithmbaseonbestestimateofthenavigationdatacombinations.Bysimulation,we verifiedthedetectioncapabilityofthemethodforindoorweaksignalacquisitionand proposesomesuggestionsandmethodsforindoorweak signalacquisition.ThisthesisfirstintroducethesignalstructureofGlobalPositioningSystem, clarifiesthesignalcharacteristicsofindoorweaksignalandstudythreekindsof acquisitionalgorithmsonGNSSsoftwarereceiver.Thethesisthenanalyzescommon integrationtechnologyandtwokindsofindoorweaksignalacquisitionalgorithms.On thisbasic,thethesisproposesanimprovedindoorweaksignalacquisitionalgorithm. SinceCross-correlationinterferenceresultedfromstrongsignal, thethesisalso researches thecross-correlationinterferencemitigationalgorithm.Finally,thethesisproposedan improvedfinefrequencyestimationalgorithmforstrongsignalreconstructed.ThethesisworksonthesimulationandverificationfortheweakGNSSsignals acquisitionweproposed.Inordertogiveatheoreticalanalysisandpractical environmentalanalysis,we produceGNSSIFsignaleitherfromexperimentalsimulation oractualnavigationsatellitesignal.ThesimulationprogramgivestheacquisitionresultsandacquisitionprobabilitycurveunderdifferenceC/N0,Theresultsshowthatthe acquisitionmethodthisthesispresentedcaneffectivelyacquisitionGNSSindoorweak signal.Key Words：GNSSsoftwarereceiver indoorweak signal acquisition目录摘要...........................................................................................................IABSTRACT.......................