外文翻译基于单片机的汽车倒车防撞语音提示系统.docx
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外文翻译基于单片机的汽车倒车防撞语音提示系统.docx
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外文翻译基于单片机的汽车倒车防撞语音提示系统
外文资料:
BasedonnRF24E1andTMC2023automobilecollisionavoidancesystemdevelopmentandrealization
CarengineeringdepartmentofinstituteoftechnologyofMunich
ByLORENZFERDIDAD
Progressofsocietywiththedevelopmentoftimes,moreandmorecarshaveenteredordinarypeople'sfamily.Thoughthehighwaytermsisbeingupdated,yetavoidthecrowdedcurrentsituationofgettingonthecarofunavoidablehighway,inaddition,thespeedisimprovedgradually,themalignanttrafficaccidentishappeningallthetime,havebroughttheenormouslifeandpropertylosstopeopleandthesociety.Caranticollisionsystemwhetheronecansendoutseeingandhearingsurveydeviceofwarningsignalinadvancetodriver.Itinstall,atcar,cansurvey,attemptpedestrian,vehicleorbarrieraroundclosetheautomobilebodyusually;Cansendoutandcollidethedangeroussignalsoontodriverandpassengeraheadoftime,impeldriverbypassdrivertakeemergencymeasurepunishspecialdangeroussituationeven,avoidlosses.Atpresent,thoughvariouscountriesstudy,preventsystemofcollidingfrom(usuallycalltheinitiativesecuritysystemintheworld),buthowcouldsolvethetimidandalertproblembetter,perplexingrelevantworkersallthetime.Theresearcherintheworldstudiesthroughalargenumberofexperiments,hasalreadyreachedcommonunderstanding,ifwanttosolveproblemdescribedaboveeffectively,theanticollisionsystemmusthavethefollowingfunctions:
1)Mustbecapableofexaminingtheangle,theazimuthalinformationofthegoalisessentialforremovingemptilyandalertly
(2)Apttoproduceanti-interferenceperformancestrongcomplicatedtransmissionsignal,cooperatewithreal-timehigh-efficientsignaldealwithwithgoalmeasuringalgorithms,inordertoremoveemptilyandalertly.
Onlytheabovetwopointscombinetogetherandguaranteethesystematicdependabilitythatthecardefendscollidingclosely.
1TMC2023chipandthenRF24E1chipcharacteristicintroducedTMC2032isonekindofnewentiredigitalcorrelationinstrumentelectriccircuit,itscorrelationwordlengthandtherelatedthresholdareprogrammable.Thischipisthemonolithic64CMOSentirenumeralcorrelationinstrumentlargescaleintegratedcircuitwhichAmericanTRWCorporationrecentyearspromoted,itsinteriorhadthreeindependentclocks8displacementspositionsregisters(stochasticdataregisterA,localcoderegisterBandshieldcoderegisterM);Moreoveralsohas7registerstousefortoloadpre-placedlimit.0~64betweenwilfullylongstochasticdataandthelocalcodeafterthecorrelationoperation,bythethreesamitthecushion7BCDcodeoutput,andlimitcomparewiththeinitializationinthecomparator,ifthecorrelativevalueisbiggerthanorisequaltolimit,thentheflagbitbylowlychangeshigh.BecausehasusedtheadvancedhighspeedCMOSproductioncraft,theparallelcorrelationspeedreachesashighasabove30MHz.Butwidelyappliestosynchronization,thematchedfiltering,harmsinthecodeexamination,therecordingandthebarcoderecognition,especiallysuitstotheradarsignalrecognition.NRF24E1isonekindofoperatingfrequencymayachieve2.4GHzthewirelessradiofrequencyreceivinganddispatchingchip,thechanneloperationtimeissmallerthan200mus,thedatarateis1Mbpsoutside,doesnotneedtomeettheSAWfilter,isglobalgenerallowcostradiofrequencysystemlevelchipwhichthepresentworldpromotesforthefirsttime.Theinteriorinlayshaswith8,051compatiblemicroprocessorsand109inputsA/Dswitches,maybetweenunderthe1.9V~3.6Vvoltagethesteadywork;TheinterioralsoinlayshaveimpresstheadjusterandtheVDDvoltagemonitoringdevice.WirelessreceivinganddispatchingpartiallyhaswiththenRF2401similarfunction,thisfunctionstartsbytheinternalparallelmouthandinternalSPI,eachdue-outsignalsaysregardingtheprocessorallmaytakeseverscarriesontheprogramming,orgivesthemicroprocessorthroughtheGPIOportbiography.ChipnRF24E1mayrealizethewirelesscommunicationinworldpublicfrequencybandscope2.4~2.5GHz.Receivesanddispatchesthepartialpackagestoincludethefrequencydivider,theamplifier,theregulatorandtworeceivinganddispatchingunits.Theoutputenergy,thefrequencybandandotherradiofrequencyparameterpassableradiofrequencyregistersconvenientlyhaveprogrammedtheadjustment.Underthetransmissionpattern,thecurrentconsumptiononlyhas10.5mA;Underthereceivepattern,thecurrentconsumptiononlyhas18mA,thereforethepowerlossisquitelow.
2systemsstructuresentirewrapinformationgatheringsystemiscomposedbyfivesetsofradiofrequencieslaunchesandthereceivingdevice,eachsetoflaunchesandthereceivepartialbasicelectriccircuitsallaresame,thesefivesetsoftransmitter-receiversetalsoisconnectedwiththeDSPcentralprocessor,thecentralprocessorisresponsibleforthedatawhichcalculatesthemtopasson,makesthedecision-makingaccordingtotheactualsituation.Eachsetoflaunchesandreceivingdevicestructurelikechart1shows.FirstbyasthecoreradiofrequencytransmissioncircuitproducesthehighfrequencyelectromagneticwavetakenRF24E1,thenthemodulationsignalwhichsendsbycorrelationoperationchipTMC2032toitcarriesonthemodulation,thusproduceswithotherradiofrequencyreceivinganddispatchingunitdifferentradio-frequencysignals,preparesforfullforthereceive.Inordertoenabletheelectromagneticwavesignaltohavetheenoughfarpropagationdistance,butalsoneedstomodulateafterthesignaltocarryontheenlargement,completesthisfunctiontheelectriccircuitisthemeritputstheelectriccircuit.Finallypassesonairbornetoasuchsignal.Whensendsouttheelectromagneticwavemeetswhentheobstaclereturns,firstmustaftercorrelationoperationchipTMC2032toitcarryontherecognition,ifthesamegrouplaunchespartiallysendsreceives,andfurtherbequeathsthissignaltheradiofrequencyreceivepart;Otherwiserefusestoreceive.ThenthereceivepartiallyproducesaccordingtotheelectromagneticwaveintheairbornedisseminationThephasemovedcalculatesthetimewhichitsdisseminationconsumes,againcalculatestheobstacleandthisgroupofreceivinganddispatchingpartialdistances.Finallygivesthisdistanceinformationthecentralprocessor.Centralprocessingmonolithicconfidentialatthesametimethedistanceinformationwhichpassesontofivegroupsofradiofrequenciesreceivinganddispatchingunitmakesthecomputation,obtainsobstacleandvehiclespatialpositionwhichmeasured.Reachesthispoint,theobstacleinformationgatheringworkbasicallycompletes,isleftoverisbequeathsagainthiscomprehensiveinformationthehigherparaffincentralprocessor,letsitmakethefinaldecision-making。
3receivinganddispatchingunitsschemeofarrangementandthecomputationprincipleautomobileinthemiddleofthetravelprocess,regardingthefrontobstacle,mustbeabletojudgetheobstacletobeawayfromthecomputation,A,B,Cthreedistinguishtherepresentativetoinstallinfrontofthefrontofatrainthreesupersonicsensors;Erepresentstheobstacle;ThentheEFexpressionfromEtothehorizontalplanedistance,FGrepresentstheobstacletothefrontofatrainplanedistance,AGexpressestheobstacletoavehiclesidedistance.TherequestisEF,FGandAGthesethreecanexpresstheobstacleandtheautomobilespatialrelativepositiontangentialpath.Solutionasfollows:
InDeltaABC,makesBDAC,connectsEDandFD,thenmayaskDeltaABCareaSDeltaABC,namely:
SDeltatheABC=intheformula,S=(T1+T2+T3),T1,T2,T3separatelyexpresslinesegmentAB,BC,theAClengththereforeBD=2SDeltaABC/ACinDeltaADE,DistanceS1,S2,S3andknowndistanceT1,T2,T3cansurveywhichtheradiofrequencyreceivinganddispatchingsystemseparatelyreplaceAE,BE,CE,AB,BC,AC,thenmayresultinthreewhichaskstobeawayfromEF,FG,theAGvalue.
4usesrelatedalgorithmalongwithradiofrequencyindailylifewidespreadapplication,thepeoplegraduallydiscoveredtheradiofrequencyrangefinderhasthecertainflaw:
(1)Theusefuleffectisawayfromquiteshort,onlydependsontheenhancementemissivepowertoincreasethesurveydistanceisverylimited;
(2)Therangefinderprecisionmainlyisdecidedbytheechosignalsinglatonoiseratio,inthecertainsignaltonoiseratiosituation,onlydependsonbeforetheincreasetheleveltoenlargetheelectriccircuitthegaintoimprovethemeasuringaccuracyalsoismustoftenlimited.Inordertosolvetheaboveproblem,intheautomobilecollisionavoidancesystem,hasconceivedbasedonthepseudo-codemodulationradiofrequencylaunchandthereceivingsystem.ThewhitenoisespurtvalueobeystheGaussiandistribution(normaldistribution).Itspowerspectraldensityintheverywidefrequencybandiseven,moreovertheautocorrelationfunctionhasdeltathefunctionshape.Thepseudo-randomcodealthoughonlyhastwolevels,butactuallyhasthesimilarwhitenoisetherelatedcharacteristic,onlyisitsscopeprobabilitydistributionnolongerobeystheGaussiandistribution.Therefore,mayusethepseudo-randomsequencethebalancedcharacteristic,thetouristitinerarycharacteristicandthecorrelationcharacteristicandsoondescribesthewhitenoise.Thepseudo-randomcodeiswiththelogicoperationrealization,thesignalautocorrelationfunctionsatisfies:
Obviously,whenPenoughisbig,theautocorrelationcoefficienthastheincisivetwolevelscharacteristic,approachesdeltathefunction.Inbasedoninthepseudo-randomcodeultrasonicranging,ispreciselysurveysbetweenthelaunch
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