英文文献翻译基于ARM与线性CCD高速数据采毕业设计.docx

英文文献翻译基于ARM与线性CCD高速数据采毕业设计.docx

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英文文献翻译基于ARM与线性CCD高速数据采毕业设计

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毕业设计

中英文翻译

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2011年6月

High–SpeedDataAcquisitionSystemBasedonARM&Linear-CCD

DongJianjunZhaoXiaojin

Dept.Four,TheFirstAeronauticalTechnicalCollegeoftheAirForceXinyang464000.China.

Abstract:

Thispaperpresentsasystemoflinear-CCDbasedonARM,theworkingclockfrequencyofARM,CPLDandFIFOareusedasIObetweenADandARM.Itmakesthecircuitworksordertoincreasethecommunicationspeed,theUniversalSerialBus（USB）technologyisadoptedtocommunicatewiththePC.ARMisthekeyprocessorutilizedtocontrolthedatasampling,datacomputeanddatatransfer.Asaresult,thewholesystemworkseffective.Thesystemcanbeappliedtotheandoperationsituationsfrommulti-channelanalogsignals.

KeyWords:

ARM;LinearCCD;Contact-line;Pantograph;Stagger–value

I.Introduction

Inelectrificationrailways,inordertoextendthelifeofthepantographonelectriclocomotives,sothatthesliderofpantographwearevenly,thecontact-line（electrifiedrailwaypowerfeedline）instraight-linesegmentsisarrangedaszigzagroute（curvesectionarrangedintheformofpolyline）.Thedistancebetweenthecontact-lineofpositioningpointandthepantographcenterlinetrackiscalledoutstagger-value,whichisakeyindicatorofcontact-line.

Stagger-valuecannotbeignored,thevaluetoosmallwillaffectthesliderofpantographwearevenlyandthepurposeofextendingusinglife;otherwise,insomecases（suchascaughtinastiffwinds）,causealargerangeoflateralmovementoftheroof（andtheexcessoftheeffectiveworklengthofpantograph,sothatthestagger-valueofcontact-linebeyondthestandardrange,leadingtodeteriorationofthecurrentcollection,andevencauseincorrectrunningofthepantographaccident.Pantograph-catenarymalfunctionwillresultininterruptionoftrainoperation,whichimpactonrailtransportseriously.Inordertoavoidthesephenomena,thestagger-valueanditschangesshouldbetestedregularly.Therefore,alocomotivecontact-linemonitoringsystemanditsmatingdataacquisitionsystemweredeveloped,whichcalculatetheinstantstagger-valuequickly.

II.SystemComponents

Systeminfigure1.

Thesystemconsistsofthefollowingcomponents:

（1）usingTOSHIBACompany’sofcontact-lineimages（CCDoutputthesignalofcorrespondingtimesequenceofposition）;

（2）usingAtmelCompany’sAT91RM9200processorofARM9seriestorealizedigitalsignalacquisitionandprocessing;（3）usingPDIUSBD12USBinterfacedevicetocompletethedatacommunicationsbetweenmeasurementsystemandthePC.

DuetothecharacteristicsofitsimprovedHarvardstructure,specialinstructionsandquicktorealizeavarietyofsignalprocessing,ARMprocessoriswidelyusedinimageprocessing,communications,radar,sonar,precisionmachineryfields,etc.ARMprocessorisadoptedforitsarithmeticspeedandbuswidth.Asthereal-timesignalanalysisandcalculationrequirea1632-bitRISC（reducedinstructionsetcomputer）microcontroller,whichincorporatesarichsetofapplicationperipheralsandprovideasingle-chipsolutionforindustrialcontrolapplicationsthatrequireawiderangeofperipheralsatlowpowerconsumptionandstrictlystableworking.

Fig1Systemblockdiagram

.Real-timeprocessingandtransmissionofCCDdigitalimage

Inordertoachievereal-timedigitalimage

transmission,severalmajorfactorswhichaffectreal-timetransmissionshouldbenecessarytosolve:

First,thespeedoflineararrayCCDdataacquisition;Second,thetransmissionspeedbetweenlineararrayCCDandARMprocessor;thethirdisthedatatransmissionspeedbetweenARMprocessorandcomputer.Thefollowingwillbedescribedindetail.

A.LineararrayCCDacquisitionspeed

Acquisitionspeedisacriticalperformanceindicatorforimagesensor,TOSHIBACompany’sTCD1209DlineararrayCCDisusedtomeetthetargets.Itsclockpulsefrequencycanoperateasinfigure2.

B.TransmissionspeedbetweenCCDandARMprocessor

InordertoimprovethespeedofCCDdataacquisitionandreduceconversiontime,adoptingmakeitexchangedatawithARMprocessoratdeviceisadopted.It’sasingle-channel,8-bitADconverter,whichoperatesoverawiderangeoftemperature,convertsfast,operatesatconversionratesupto230MSPS,thusachievingentiresignalacquisitionoflineararrayCCD.ADC08200isshowninfigure3.

Fig3High-speedADconverterADC080200

FIFOisusedasadatabuffertoco-ordinatetherateofARMprocessorandADC.Itisatwo-port（inputandoutputport）memoryfortemporarystorageoffirstinfirstoutdata.DuetothetimetowritedatatoFIFOisfarlessthantheADconversiontime,therefore,theacquisitionspeeddependsontheADconversionspeed.

Inordertoimprovethespeedoftheentire