gnss多频段卫星信号模拟器关键技术分析及其实现-analysis and implementation of key technologies of gnss multiband satellite signal simulator.docx

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2018-06-04 发布于上海
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gnss多频段卫星信号模拟器关键技术分析及其实现-analysis and implementation of key technologies of gnss multiband satellite signal simulator.docx

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gnss多频段卫星信号模拟器关键技术分析及其实现-analysis and implementation of key technologies of gnss multiband satellite signal simulator

AbstractAbstractWiththeestablishmentanddevelopmentofglobalnavigationsatellitesystems, satellite navigationhasbeenplayingapivotalroleinmanyareasofmodernsociety.GNSS satellitesignalsimulator,whichcouldsimulatevarioussophisticatedenvironments,and generateGNSSsignalswithhighprecisionandstability,providesanintegratedplatformforthedesignandperformancetestingofGPS/GLONASSmulti-modereceiver.ThispaperconcentratesontheresearchandrealizationofGNSSmulti-bandsatellitesignalsimulator.StartingfromthebasictheoryofGPS/GLONASSnavigationsystem,itgivesthesignalsimulationmodelbasedontheanalysisofthesignalsystem.Itcarriesoutdeepresearchandmakesseveralimprovementsinthekeytechnologiesofsatellitesignalsimulator,whichincludessatelliteorbitrecurrence,errormodelsimulation,high-precision signaldelay,temporalandspatialcoordinatesynchronization.Tomeettherequirementsof signalprecisionunderhigh-dynamicenvironment,thispaperproposesanovelmethodof pseudo-rangecalculationand 3-orderfrequencysynthesization.Inaddition,thispaper proposesanINSobserveddatasimulationmethod,whichcansimulatetheGNSS/INS integratedsignalthroughdatacombinationwithsatellitesignalsimulationalgorithm.Thepaperaddressestheoveralldesignscheme,elaboratesonthefunctionandimplementation methodsofthemajormodulesofDSPandFPGAsoftware,andfocusesonthedesignof keymodules,includingcarriertrajectorygeneration,initialphasecalculation,frequency correction,messagetransmissiontiming.Finally,thepaperrealizesthedesignofGNSSmulti-bandsignalsimulatorbasedon thedual-DPSplusFPGAhardwareplatform,andconductssufficienttestsandevaluation ofits performancethroughtheclosed-looptestingsystem. Tesing resultsareasfollows:(1) Understaticcircumstance, the positioning precision forGPSL1/L5dual-frequency,GLON ASSL1/L2dual-frequencyandGPS/GLONASSdual-modeare±8m,±15mand±10mres pectively.(2)Underdynamiccircumstance,thepositioningresultsofuniformlyaccelerated rectilinearmotionandcircularmotion correspondwiththesimulatorsetting.(3)WhenGNS SreceiverusesINSobserveddata to cal