数字轨道地图辅助的列车定位方法研究

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1、北京交通大学硕士学位论文数字轨道地图辅助的列车定位方法研究姓名：李翀申请学位级别：硕士专业：交通信息工程及控制指导教师：蔡伯根20080601ABSTRACTABSTRACT：Withthedevelopmentofrailwaytransportation，traindensityandspeedhaveincreasedgreatly．Itmakesincreasingrequirementfortrainpositioningaccuracyandreliability．Trackdigitalmaphasbeen

2、widelyadoptedinmap—matchingduetoitslowcostandreliablecharacteristic．However,map-matchingdoesn'tdealwitllGPScomputationsandsimplyobtainsthenavigationsolutionfromGPS，SOitbecomesinvalidwithoutvalidGPSoutput．Thus，it’Ssignificanttousetheaccuratetrackdigitalmaptodevelo

3、patrainpositioningmethodwitllhigherperformance．TheparticularitythattrainmovesalongfixedtrajectorymakesitpossibletoUSetrackmapdirectlyintrainpositioningsolution．Firstly,amap-aidedGPSintegritymonitoringalgorithmcalledMA-RAIMisproposed．Anewlocaltrack-basedcoordinate

4、systemisapplied，andthetrackgeographicalinformationprovidedbytrackmapdatabaseisadoptedforredundancyequationandconstraintinthisalgorithm．TheerroneousGPSmeasurementwillbeeliminatedfromthecomputationifitexceedsthethresholdlimit．Tllisalgorithmnotonlyensurestheposition

5、ingprecision,butalsorelievesthehighrequirementforsatellitenumberclaimedbyconventionalGPSintegritymonitoring．OnthebasisofMA—RAIM，thisthesisconcentratesonaninnovativemap—aidedtrainpositioningapproachwhichintegratestrackmapdata,GPSsatelliteephemerisandrawmeasurement

6、sinpositioningcomputations．Inthiskeyapproach，amap—aidedpositionmeasurementmodelandamap·aidedvelocitymeasurementmodelaleproposed，inwhichLeastsquaresmethodandKalmanfilterarerespectivelyadoptedtocalculatethepositionandvelocityoftrain．Thefinalsolutionisintegratedbyas

7、signingsuitableweightstothetwomentionedmodels．Detailedmathematicaldeduceandsimulationfortheproposedmethodalegiveninthethesis．Onthebasisofsimulation,theexperimentalverificationfortheproposedmethodiscarriedout，andtheperformanceisevaluatedandanalyzed．Theresultsshowt

8、hat，thetrainpositioningaccuracyandstabilityfortheproposedmethodisobviouslyimprovedunderthesameconditions，comparedtothecurrentsolutionbothinnormalandsignalshado