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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
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