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1、High–SpeedDataAcquisitionSystemBasedonARMLinear-CCDAbstract:Thispaperpresentsahighspeedacquisitionsystemoflinear-CCDbasedonARM,high-speedlinear-CCDandhigh-speedADCareselected.AsthesamplingspeedofA/DisslowerthantheworkingclockfrequencyofARM,CPLDandFIFOareusedasI/ObetweenA
2、/DandARM.Itmakesthecircuitworksharmonious,simpleandeasycontrolling,andalsoincreasestheefficiencyofARM.Inordertoincreasethecommunicationspeed,theUniversalSerialBus(USB)technologyisadoptedtocommunicatewiththePC.ARMisthekeyprocessorutilizedtocontrolthedatasampling,datacompu
3、teanddatatransfer.Asaresult,thewholesystemworkseffective.Thesystemcanbeappliedtothehighspeeddataacquisitionandoperationsituationsfrommulti-channelanalogsignals.KeyWords:ARM;LinearCCD;Contact-line;Pantograph;Stagger–valueI.IntroductionInelectrificationrailways,inordertoex
4、tendthelifeofthepantographonelectriclocomotives,sothatthesliderofpantographwearevenly,thecontact-line(electrifiedrailwaypowerfeedline)instraight-linesegmentsisarrangedaszigzagroute(curvesectionarrangedintheformofpolyline).Thedistancebetweenthecontact-lineofpositioningpoi
5、ntandthepantographcenterlinetrackiscalledoutstagger-value,whichisakeyindicatorofcontact-line.Stagger-valuecannotbeignored,thevaluetoosmallwillaffectthesliderofpantographwearevenlyandthepurposeofextendingusinglife;otherwise,insomecases(suchascaughtinastiffwinds),causealar
6、gerangeoflateralmovementoftheroof(andthehigherthespeed,thegreaterpantographswingaround),somepartsofcontact-linewillbeinexcessoftheeffectiveworklengthofpantograph,sothatthestagger-valueofcontact-linebeyondthestandardrange,leadingtodeteriorationofthecurrentcollection,andev
7、encauseincorrectrunningofthepantographaccident.Pantograph-catenarymalfunctionwillresultininterruptionoftrainoperation,whichimpactonrailtransportseriously.Inordertoavoidthesephenomena,thestagger-valueanditschangesshouldbetestedregularly.Therefore,alocomotivecontact-linemo
8、nitoringsystemanditsmatingdataacquisitionsystemweredeveloped,whichcalculatetheinstantstagger-valuequick