泛在无线信号定位技术的优化分析

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1、万方数据北京交通大学硕士专业学位论文ABSTRACTABSTRACTABSTRACT：Withtherapiddevelopmentofwirelesscommunicationandinformationtechnology,thecommercialscaleoflocalizationtechnologyhasbeenincreasing．111eGPS-basedlocalizationtechnologyisoftenunavailableintheindoor,underground,denseurban孤．e嬲orunderthebadweathercondi

2、tions，SOtheland—basedubiquitouswirelesssignallocalizationbecomesthenecessaryadditionaltechnique．Althoughithasbeencommercialized,itsperformanceislimitedbythemeasurementerrorinthecomplexenvironment,whichcauseslowlocalizationaccuracy．Atthesametime，consideringthecontradictionbetweenthelocaliza

3、tionaccuracyandthecomplexity,theerrormitigationtechnologywithlowcomplexitybecomestheresearchhotspotinthefieldoflocalizafion．Throughthereviewoftherelatedliteratureandresearchstatus，threemajorresearchdirectionsarestudiedinthispaper：theNon-Line-of-Sighterrormitigationtechnology,thelocalizatio

4、ntechnologyutilizingthesignalreflectedpathsinthemultipathtransmissionandthenodelocalizationtechnologyinthewirelesssensornetwork．rnleresearchandinnovationpointsareasfollows．RegardingtotheNon-Line-of-Sighterrormitigationtechnology,thewirelesslocalizationalgorithmsbasedondistancegeometryaresu

5、mmarizedandanalyzed，anditisappliedtothecellularnetworkenvironment．111econstraintconditionsbasedontheoryofdistancegeometryusing4and3basestationstolocatearededucedrespectively,andthemeasurementsareop"ttmizedwiththefilteralgorithmbasedonthedatasearchandtheconstraintalgorithmbasedonnonlinearop

6、timizationrespectively．Accordingtothecharacteristicsofthetwomethods，analysisoftheapplicationscenariosiscarriedout．Simulationresultsshowitseffeetiveness．Regardingtothelocalizationtechnologyutilizingthesignalreflectedpathsinthemultipathtransmission,theLPMD(LineofPossibleMobileDevice)algorith

7、mutili7：ingthesingle-boundreflectedpathisimprovedfirstly．Andthen,basedontheideologyofraytrac迦anddeadreckoning，thesignalpathreckoningmethod沥ththeassistanceofgeographicinformationsystemisproposedtosolvetheproblemwiththemulti-boundreflectedpath．Withtheidealizatio