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ID:32289947
大小:7.79 MB
页数:72页
时间:2019-02-02
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1、西南交通大学硕士研究生学位论文第11页AbstractNow.、历mrapiddevelopmentofdomesticandinternationalhigh·speedrailwaysandhigll-speedtrains,anddistributednetworkcontrolsystems,traincommunicationnetwork(TCN)hasbeenwidelyappliedtothenewtrainsintheworld.InthefivekindsofCRHMultipleU
2、nits(MU)developedinChina,threekindsofMUuseTCNnetworkcontroltechnology.MultifunctionVehicleBus(MVB)gatewayisallimportantcomponentofTCN.butitsresearchandapplicationinChinaarefacedwimlong—termtechnologyblockadeandmarketmonopolyofforei弘manufacturers.And,beca
3、useofthedifferenceofthetechnicalstandardsbetweentherailtransmissionequipmentmanufacturers,manyboardequipmentsdonotsupporttheMVBbuscommunicationfunctions.ThismakesthatMVBgatewayiswidelyused.ButmanyMVBgatewaysonlyhavesingleprotocolconversionfunction.Thisno
4、tonlyviolatestheopennessprincipleofthetrainbus,butalsoaffectsthecompatibilityofMVBgateway.Underthisresearchbackgroundandapplicationenvironment,thesubjectreferstoTCNnetworkcommunicationstandardsIEC61375·1,andcombinesWi-Fiwhichisacurrentwirelesscommunicati
5、onhotspot,withCANbus,RS-485busandRS-232buswhicharewidelyappliedtotrains.ThepaperproposesaMVBmulti-protocolcommunicationgatewayscheme.Firstly,thispaperoutlinestheoveralldevelopmentofTCNandMVBgateway,secondlywefurtherresearchthekeytechnologyintheMVBmulti—p
6、rotocolcommunicationgateway,especiallytheprocessdatacommunicationofMVBreal-timeprotocol;Lastly,weanalyzethedesignandimplementationofboththemulti-protocolgatewaysoftwareandhardwareindetail.Forthehardware,thesystemusesasmallembeddedMVBcommunicationboardSSM
7、V62ADandhi曲一performanceandlow-powerARMprocessorSTM32F103ZET6developedbySTMicroelectronics.AndwedesignanddebugPCBhardwareboardofMVBmulti—protocolgateway.Forthesoftware,accordingtotheprincipleofrealtimeandreliabilityofMVBprocessdatalinklayercommunication,t
8、hepaperproposesthetraingatewayresidentialport,thedevicegatewaysourceport,andtheperiodicallytriggeraccesstooccasionaldatasetsschemes.AndfortheunreliableUDPtransmissioninWi—Fiwirelesscommunications,basedontheTCPtimeoutandret
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