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1、2010InternationalConferenceonComputer,Mechatronics,ControlandElectronicEngineering(CMCE)StudyonGPS-basedPortableFieldRescuePositioningSystemXiaoLuoJiandongZhaoYichaoLiuDept.Mechanical,ElectronicandDept.Mechanical,ElectronicandDept.Mechanical,Electroni
2、candControlengineeringControlengineeringControlengineeringBeijingJiaotongUniversity,BeijingJiaotongUniversity,BeijingJiaotongUniversity,HaidianDistrict,BeijingHaidianDistrict,BeijingHaidianDistrict,BeijingIx881124@yahoo.com.cnzhaojd@bjtu.edu.cnannosky
3、@hotmail.comAbstract-ThepaperpresentsaGPS-basedpositioningmethodmainlyusedtofieldrescue.ThepositionandorientationoftherescuerandthetrappedareacquiredusingGPSchipanddigitalcompass.UsingtheGPSdataandcompassdata,therelativedistanceandorientationbetweenth
4、emarecalculatedfromthegeometricrelationshipsbasedonaseriesofformulasinGeographicInformationScience(GIS).Usingthistechnology,wedevelopasolar-poweredportablefield-rescuedevice.Theexperimentsprovethatthedevicecandoaccuratecoordinationviawirelesscommunica
5、tion,helpingrescuerstosearchthetrappedmoreaccuratelyandquickly.Keyword-fieldrescuesystem;GPSnavigationandlocation;wirelessdatatransmission;digitalcompass;EmbeddedSystemsFigureI.Thesystemstructure.1.INTRODUCTIONHowever,thereisnorelativeangleinformation
6、inGPSInrecentyears,withtheincreasinglypopularofthedataoutput,andunabletocalculatetherelativedirection.TooutdooradventureinChina,theoutdoorrescuegraduallysolvethisproblem,thesystemusesadigitalcompass[2],comingintoview.Astheoutdooradventurewithacertain[
7、3].whichtransmitsthedataofabsolutepositioncollectedbydegreeofrisksuchasdisappearance,thegovernmentisreluctancesensortothecontroller,asthenavigationworkinghardtoimprovethefieldrescuesystem.referenceazimuth[4],[5].Fromthepastexperience,itisfoundthatinth
8、eprocessConsideringaboutthere'snomobilephonenetworkofwaitingforrescue,themostdifficultproblemisthatthesignalinthefield,weuseawirelessdatatransmissiontrappedunabletoknowtheirlocationsaccuratelyforthelackmoduletoimplementthecommunicationamongmul
