基于单片机的汽车防盗报警系统设计-中英文参考资料.docx

BasedonmonolithicintegratedcircuitautomobilesecurityalarmsystemdesignAbstractjDecodestheautomobilesecuritysystemusingthemonlitchisintegratedcircuitinteriorresourcesrealizationjumpcode,iteachtimeusestheremotecontrolpasswordallischanging,bothenhancedthesystemsecurity,andgreatlyreducedthecost.KeywrOrdjMonolithicintegratedcircuit,Automobilesecuritysystem,Code/decodeIntroductionIsunceasinglyprogressivealongwiththesocialeconomyandthehightechrapiddevelopment,intheroutineworkandthelife,theautomobilehasbecomethepeopleidealtransportationvehicle.Butthefollowingmotorvehiclethecasewhichrobbedgraduallyisalsoincreasedhascreatedthepiloteconomicalpropertyloss.Inordertoreducetheautomobiletorobtheeventtheformationrate,forhastheautomobiletheusertoprovidethesafetycontrol,simplydevelopsonekindtobereliable,theeaseofoperation,cansendoutinthediscoverynormalconditiontothepilotreportstothepolicethereminderandthesecuritywarningsafetysystemhasthepracticalsignificance.Thisarticlebasedontotheexistingautomobilesecurityalarmsystemgeneralizedanalysis,developsonekindofbrand-newsecurityalarmsystem.Thissystemhasmainlyusedthejumpcodecode/decodingprinciple,causestheoverallsystemtobesafer,greatlyreducespasswordexplainingrate.1.SystemprincipleofworkTheautomobilesecurityalarmsystemtheremotecontrolwhichcarriesbythedriverandinstallsintheautomobilethecontrollertwopartscomposes.TheremotecontrolandthecontrolleralluseeightCMOSwhichAmericanAT-MELCorporationproducestheAVRmonolithicintegratedcircuit,thisseriesmonolithicintegratedcircuitbasedonnewsimplifiesinstructionRtheISCstructure,includestheservicelifemosttobefewis1,000timewrites/scratchesthecirculationtheFlashprogrammemory,aswellastheservicelifeatleastis100,OOOtimewrites/scratchesthecirculationEtheEPROMdata-carrierstorage,some2onlyhavewhentheentirepiececleaningcancleanIheprogrammingencryptionlocksthelocalization.1.lSystemdesignTheautomobilesecurityexaminationusestheultrasonicsensor.Theultrasonicsensoriscomposedbytheultrasonicwavetransmissioncircuitandthesupersonicreceptionelectriccircuit,intheautomobilecabappropriateposition,installstheultrasonicWaveIaunchZreceiver,aswellasswitchelectriccircuitTl.Whentheautomobileparksthevehicleownerpersonmustleavetheautomobile,withremotecontrolclosedswitchTl,theautomobilealarmsystemsatgarrisonsthecondition,aroundthesystemuseultrasonicwaveexaminationvehicleobstacle.Launchesthepartialelectriccircuitslikeschart1toshow.WhenitsPlmouthPl.1,Pl.2totheDtrig,thePLOcontrolultrasonicwavelaunch,are0,thehotoelectricitycoupleroutputstheTPlendis1,thepermissionultrasonicwavelaunch,launches/thereceiveultrasonicwaveinturn,thecirculationrepeatedlycarrieson.Simultaneouslythemonolithicintegratedcircuitinteriorcounterstartstocount.Thesteamdistancebetweenvehiclesobstacledistanceisthetimewhichsendsoutthroughthesoundnavigationandrangingreflectsspendsdeterminesandcarriesonthecomputation.ThereflectionsignalcausestheDtriggertoproduceinterruptrequestsignalINTl,simultaneouslystopscounting,readstakescountsthevalue,calculatestheactualdistanceaftertheformula,thencarriesonthecomparisonwiththedatumdistance,ifexamineswhentheactualdistanceisbiggerthanreferencevalue80Crn,doesnotcarryontheaccustom-opticstoreporttothepolice;IfsomepeopleapproachIheautomobiletoenterthecab,theexaminationactualdistanceissmallerthanorwasequaltowhenreferencevalue80cm,throughmonolithicintegratedcircuitP2.2andtheP2.3port,actuatestheindicatinglampdisplaycircuitandthesoundalarmcircuit,sendsoutthreetwoflash.Andtriggersahighlevel,theactuationiswirelesssignaltransmissioncircuit.Chart!Ultrasonicwavetransmissioncircuit1.2CodeZdecodingprincipleThepresentautomobileremotecontrolsecuritysystemaremanyisusesVD502627,PT226272,HT12EDandsoonthegeneralcode/decodestheelectriccircuit,itspassworddecidedbythecomponentaddress,eachsetofsecuritysystemsuseafixedinvariablepassword.Alongwiththemicroprocessingtechnologydevelopment,throughthereceiveremotecontroltransmittingmessage,mayinterceptthisfixedpassword,moreovergeneralarrangesthedecodingaddresstolosethepersontocarrythecomponentsizelimit,itsquantityisimpossibletoomuch,canobtainnotrepeatedlycclesveryisalsolimited,alsocanveryquicklyexplainthepasswordwiththeautomaticScannerTherefbre,thiskindofpasswordfixedinvariableautomobilesecuritysystemhasreceivedtheseriousthreat.Decodestheautomobilesecuritysystemusingthemonolithicintegratedcircuitinteriorresourcesrealizationjumpcode,iteachtimeusestheremotecontrolpasswordallischanging,withthepasswordnolongerduplicatesuses,causestheinterceptionpasswordalsoismakesafutileeffort,inaddition,itmayincreasetheenoughmanypasswordsfigure,enhancesthesystemresistanceillegalscanningtheability.Theremotecontrolcodingaltogetherhas12bytes,separatelyby3bytescodeschannelscode,3bytescodesforewordsnumber,5bytesjumpscodes,1bytepressedkeyoperationcodeiscomposed.EncodedfrontaddsonIogicineachbyteOtotaketheoutsetposition,encodedbehindaddsonalogical1achievementineachbytetostoptheposition,andinmostfrontaddsonseverallogic1totaketheguidancesignal,Ihisconstitutedtheserial