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1、VariablerateirrRationcontrolsystemiitegratedwithGPSandGISYangQing1，PangShujieh3，YangChenghai2Systemprheple,LiMintong1，LiYongjun1,YangShuming1(LCollegeofMechanicalandElectronicEngineeriny,NorthwestAricuItureandForestryUniversity9Yangling,Shaanxi712100，China2USDA2RSKik
2、adelaGarzaSubtropicaIAricuIturaIResearchCenter,VVeslaco,Texas78596，USA；3.ChineseAcadanyofAgricuIturaIMechanizationSciences，Beijing100083,China)AbstractTheobjectiveofthisstudyistouseadvancedelectronicandcomputertechnologytodesignapracticalandeco2nomicalvariablerateirri
3、gationcontrolsystemaccordingtotheactualconditionsinruralareasofChina.Thecontrolsystemintegratessingle2chipmicyoco(SCM)technology,GlobalPositioningSystem(GPS)andGeographicInformationSystem(GIS).ThemainhardwareandsoftwarecomponentsofthesystemincludeanAT89C51single2chipun
4、itasthemicropro2cessor，anIC(IntegratedCircuit)cardusedtotransferGISinformationintheunit，andaGPSreceiverbasedonJupiterGPSOEMdevelopedindependentlyMeanwhile，ashipieandquickdata^ueryingalgorithmbasedonthevectormethodwasputforwardandusedinthesystem.Thecontrolsystemreceived
5、positioninformationfromtheGPSOEM，recognizedthesiteanddeterminedthevehiclepositioninthefield.Then，theamountofwatertobeappliedwasfoundfromawaterprescriptionmapontheICcardbasedonthepositiondata，andthewaterflowratewascalculatedbasedonvehiclespeedandthespraywidth.Finally，th
6、eflowinformationwasconvertedtoanelectronicsignaltodriveawatcr2rcgulatingvalveonanirrigationmachinetoaccomplishvariablerateirrigation.TheexperimentresultsinfieldandlaboratoryshowedthattherewasapproximateaccuracyforthelowcostGPSOEMreceiverself2developedcomparedwithTrambl
7、eAgGPS132，andthecontrolsystemwasabletofulfillvariablerateirrigationautomaticallybasedonaprescriptionmaportoapplyaspecifiedamountofwaterthroughmanualcontrolKeywords:variablerateirrigation;controlsystem;prescriptioninap；GPSOEM;GISCLCNimber:TP273;S2742DocumentD:AArticleD:
8、100226819(2006)10201342)5YangQhg,PangShujie,YangChenghai,etalVarhblerateirrigationcontrolsystemintegratedwithGPSandG1
