基于SIM508的车载GPS终端设计.pdf

JournalofNanchangInstituteofTechnology ISSN 1674—0076 04／15 PP18—23 Volourne31，Number1，February2012 DesignofvehicleGPSterminalbasedon SIM508 LIYanhua ，XIAO Wenguang2 (1．DepartmentofElectronicInformation，AnhuiBusinessVocationCoHege，Hefei230041，China； 2．AutomobileElectronicEngineeringCentre，EastChinaResearchInstituteofElectronicEngineering，Hefei230088，China) Abstract：From theperspectiveofoptimizingproductandimprovingcompetitiveness，thispaperpointsoutsomedefectsofthe conllnonvehic1eGPSmonitoringterminals，suchaslowintegrationofhardwaremodules，highcost，largesize，andlowreliabili— tv．Thesedefectsleadtohihg costinmaintenanceandlowcustomersatisfaction．Anovelsolutionisproposedinthispaperto solvetheseDroblems．OursdutionadoptsanARM7 coreSTR750FV2T6ashtehostcontroller，nadusesGPS／GPRSmodule SIM508asthetransceivertolocateandcommunicate．ThissolutionreducesthecostandsizeofcommonvehicleGPStemr i— nalswithahihgDerformance．Theexperimentresultshowsthatoursolutionfunctionswellinpracticaluseandcanbereferred inthefurtherreserachonvehiclesafetymonitoringtechnology． Keywords：GPS；SIM508；vehiclemonitoring；ATcommands 1 Introduction Generalpacketradioservice(GPRS)basedonGSMsystemprovidesend—to—end，wideareaandwirelessIP connection．Itsendsdataintheform ofpacketwithfastspeed．highcommunicationqualitywithoutdependenceon publicswitchedtelephonenetwork[¨ anddistributesnetworkcapacitywhenitisnecessary．ThevehicleGPStemr i— ， nalmakesuseofGPRScommunicationnetworktorealizethereliabletransmissionofpositioningdaat informationto monitorclients． ． TheDositioningunitandcommunicationunitarethekeycomponentsofvehicleGPSterminal，buttheyareof- tenrealizedbvtwoseparatehardwaremodulessuchasGSM moduleMC39iorMC55ofSiemensCompanyandGPS moduleLassenIQofTrimbleCompany．Thiskindofdesi