基于单片机的汽车防盗报警系统设计中英文参考资料.docx
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基于单片机的汽车防盗报警系统设计中英文参考资料.docx
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基于单片机的汽车防盗报警系统设计中英文参考资料
Basedonmonolithicintegratedcircuitautomobilesecurityalarmsystemdesign
Abstract:
Decodestheautomobilesecuritysystemusingthemonlitchisintegratedcircuitinteriorresourcesrealizationjumpcode,iteachtimeusestheremotecontrolpasswordallischanging,bothenhancedthesystemsecurity,andgreatlyreducedthecost.
Keyword:
Monolithicintegratedcircuit,Automobilesecuritysystem,Code/decode
Introduction
Isunceasinglyprogressivealongwiththesocialeconomyandthehightechrapiddevelopment,intheroutineworkandthelife,theautomobilehasbecomethepeopleidealtransportationvehicle.Butthefollowingmotorvehiclethecasewhichrobbedgraduallyisalsoincreasedhascreatedthepiloteconomicalpropertyloss.Inordertoreducetheautomobiletorobtheeventtheformationrate,forhastheautomobiletheusertoprovidethesafetycontrol,simplydevelopsonekindtobereliable,theeaseofoperation,cansendoutinthediscoverynormalconditiontothepilotreportstothepolicethereminderandthesecuritywarningsafetysystemhasthepracticalsignificance.Thisarticlebasedontotheexistingautomobilesecurityalarmsystemgeneralizedanalysis,developsonekindofbrand-newsecurityalarmsystem.Thissystemhasmainlyusedthejumpcodecode/decodingprinciple,causestheoverallsystemtobesafer,greatlyreducespasswordexplainingrate.
1.Systemprincipleofwork
Theautomobilesecurityalarmsystemtheremotecontrolwhichcarriesbythedriverandinstallsintheautomobilethecontrollertwopartscomposes.TheremotecontrolandthecontrolleralluseeightCMOSwhichAmericanAT-MELCorporationproducestheAVRmonolithicintegratedcircuit,thisseriesmonolithicintegratedcircuitbasedonnewsimplifiesinstructionRtheISCstructure,includestheservicelifemosttobefewis1,000timewrites/scratchesthecirculationtheFlashprogrammemory,aswellastheservicelifeatleastis100,000timewrites/scratchesthecirculationEtheEPROMdata-carrierstorage,some2onlyhavewhentheentirepiececleaningcancleantheprogrammingencryptionlocksthelocalization.
1.1Systemdesign
Theautomobilesecurityexaminationusestheultrasonicsensor.Theultrasonicsensoriscomposedbytheultrasonicwavetransmissioncircuitandthesupersonicreceptionelectriccircuit,intheautomobilecabappropriateposition,installstheultrasonicwavelaunch/receiver,aswellasswitchelectriccircuitT1.Whentheautomobileparksthevehicleownerpersonmustleavetheautomobile,withremotecontrolclosedswitchT1,theautomobilealarmsystemsatgarrisonsthecondition,aroundthesystemuseultrasonicwaveexaminationvehicleobstacle.Launchesthepartialelectriccircuitslikeschart1toshow.WhenitsP1mouthP1.1,P1.2totheDtrig,theP1.0controlultrasonicwavelaunch,are0,thephotoelectricitycoupleroutputstheTP1endis1,thepermissionultrasonicwavelaunch,launches/thereceiveultrasonicwaveinturn,thecirculationrepeatedlycarrieson.Simultaneouslythemonolithicintegratedcircuitinteriorcounterstartstocount.Thesteamdistancebetweenvehiclesobstacledistanceisthetimewhichsendsoutthroughthesoundnavigationandrangingreflectsspendsdeterminesandcarriesonthecomputation.ThereflectionsignalcausestheDtriggertoproduceinterruptrequestsignalINT1,simultaneouslystopscounting,readstakescountsthevalue,calculatestheactualdistanceaftertheformula,thencarriesonthecomparisonwiththedatumdistance,ifexamineswhentheactualdistanceisbiggerthanreferencevalue80cm,doesnotcarryontheaccustom-opticstoreporttothepolice;Ifsomepeopleapproachtheautomobiletoenterthecab,theexaminationactualdistanceissmallerthanorwasequaltowhenreferencevalue80cm,throughmonolithicintegratedcircuitP2.2andtheP2.3port,actuatestheindicatinglampdisplaycircuitandthesoundalarmcircuit,sendsoutthreetwoflash.Andtriggersahighlevel,theactuationiswirelesssignaltransmissioncircuit.
Chart1Ultrasonicwavetransmissioncircuit
1.2Code/decodingprinciple
ThepresentautomobileremotecontrolsecuritysystemaremanyisusesVD5026/27,PT2262/72,HT12E/Dandsoonthegeneralcode/decodestheelectriccircuit,itspassworddecidedbythecomponentaddress,eachsetofsecuritysystemsuseafixedinvariablepassword.Alongwiththemicroprocessingtechnologydevelopment,throughthereceiveremotecontroltransmittingmessage,mayinterceptthisfixedpassword,moreovergeneralarrangesthedecodingaddresstolosethepersontocarrythecomponentsizelimit,itsquantityisimpossibletoomuch,canobtainnotrepeatedlycodesveryisalsolimited,alsocanveryquicklyexplainthepasswordwiththeautomaticscanner.Therefore,thiskindofpasswordfixedinvariableautomobilesecuritysystemhasreceivedtheseriousthreat.Decodestheautomobilesecuritysystemusingthemonolithicintegratedcircuitinteriorresourcesrealizationjumpcode,iteachtimeusestheremotecontrolpasswordallischanging,withthepasswordnolongerduplicatesuses,causestheinterceptionpasswordalsoismakesafutileeffort,inaddition,itmayincreasetheenoughmanypasswordsfigure,enhancesthesystemresistanceillegalscanningtheability.Theremotecontrolcodingaltogetherhas12bytes,separatelyby3bytescodeschannelscode,3bytescodesforewordsnumber,5bytesjumpscodes,1bytepressedkeyoperationcodeiscomposed.Encodedfrontaddsonlogicineachbyte0totaketheoutsetposition,encodedbehindaddsonalogical1achievementineachbytetostoptheposition,andinmostfrontaddsonseverallogic1totaketheguidancesignal,thisconstitutedtheserialcodedsignalwhichusesintotransmit.Thecodechannelcodeusesintoexpresstheremotecontrolstatus;eachsetofsystemsuseafixedchannelcode.Thecodeforewordnumberusesintorecordtheencodedorder,itsstartingvalueis0,themonolithicintegratedcircuiteverytimecodesatime,thecodeforewordnumberupwardlycountstime.ThecodechannelcodeandthecodeforewordnumberdepositsinmonolithicintegratedcircuitEEPROM,guaranteesthempowercuttheinfluence.Thejumpcodeisthesystematictruepassword,itpassesthroughthecomplexspecialalgorithmbythecodechannelcodeandthecodeforewordnumbertoextract,thisspecialalgorithmforeignsecurity.Thepressedkeyoperationcodebythepressedkeywhichpresseswasdecided,when"thehypothesis"thekeyispresseddown,itscodedecidesas01H;When"relieves"thekeypressesdown,itscodedecidesas00H.Whetheristhedecodingconfirmsreceivethecodelegitimateaseriesofoperatingprocess.Wasconfirmedthelegitimatecodeneedstosatisfythreeconditions;
(1)codesthechannelcodeandthedecodingchannelcodeissame;
(2)codedtheforewordnumbertobebiggerthanthedecodingforewordnumber(decodingforewordnumbertorecordonlegitimatelyhasusedcodeforewordnumber,thisconditionmightguaranteebeforehasusedcodewasinvalid);(3)jumpsthecodetobeequaltoreusesthespecialalgorithmtoextractchangesthecode.Afterthemonolithicintegratedcircuitconfirmedreceivesisthelegitimatecode,writesthecodeforewordnumberinthedecodingforewordnumber,andcompletescorrespondingoperationprocessingaccordingtotheoperationcode.ThedecodingchannelcodeandthedecodingforewordnumberalsodepositsinmonolithicintegratedcircuitEEPROM,guardsagainstbecauseofpowercutloses.
1.3Securityreportstothepolicerealization
IfwillhaverobberChenZheRutheroom,startstheautomobile,afterwrongpassword,thentheautomobilestoragebattery+12Vvoltage,theignitionelectriccurrentwayignitionlock,theignitionoutage,theengineextinguishes,againstarts,willduplicatetheaboveprocess,likethis,thebanditsandthievesalwayswillnotbeabletostarttheautomobile,willnotbeabletoachieveitsanticipatedgoal.ThealarmcircuitmainlyiscomposedbytheintegratedblockandthespeakerandelectronicswitchingSCR.Triodeorthemultiple-unittube,areforenhancetheelectriccircuitmeasurewhichthepowerbutoftenuses,ithascomposedacurrentamplificationfactorverybigequivalenttransistor,totalenlargementfactorforthesetwoenlargementfactorproduct.SCRistheelectronicswitchingwhichconstitutesbythesilicon-controlledrectifier,theelectriccapacityandtheresistanceconstitutionnegativeboosterconcurrentlyfilter,provides+3+4VtoICthevoltage,ICistracesDrawsupsoundreportstothepolicetheintegratedcircuit,thealarmapparatusbytheSCRcontrol,robsthevehiclethiefonceafterthewrongpassword,thenthestoragebatteryelectriccurrententersthesecuritysystembesidesagroup,anothergroupisstartedintheengine,afterleadstheenginework,naturalcontactoutputvoltage,afterthedifferentiatingcircuit,silicon-controlledrectifierSCRistriggered,alsopassesthroughtheresistancetofallthepressure,thevoltageaddsintheICpowersourceinputend,ICobtainsthevoltageoutputalarm,enlargesafterthemultiple-unittube,Destroysmovesthespeakertosendoutresoundinglyreportstothepolicethesound.whenstaticstate,entireelectriccircuitdoesnotconsumetheelectricity.
2.Softwaredesign
Thealarmapparatussoftwaredesignmainlydividesinto:
Masterroutine(alarmapparatusinitialization,keymodulationanddecoding);Alarmapparatusinterrupthandlingroutine.Thisalarmapparatusinstallsontheautomobilesteeringwheel.Afterinstalls,startsthealarmapparatus,thealarmapparatusautomaticallyretards20~30stostarttowork,inordertoletsusethepersontohavetheenoughtimetolockthega
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