基于虚拟仪器的信号发生器的设计与实现翻译.docx
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基于虚拟仪器的信号发生器的设计与实现翻译.docx
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基于虚拟仪器的信号发生器的设计与实现翻译
毕业论文(设计)
论文题目:
基于Labview的虚拟信号发生器的设计
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2013年05月26日
VirtualInstrumentsBasedonReconfigurableLogic
Abstract.Avirtualinstrumentresultsfromthecombinationofageneralpurposecomputerwithagenericdataacquisitionsysteminordertoemulateatraditionalmeasurementinstrument.Thedataacquisitionhardwareofthevirtualinstrumentsprovidescomputerswithinput/outputcapabilityandisusuallybasedontheintegrationofstandardcircuitswithfixedarchitecture.Meanwhilethesoftwaredefinestheanalysisandprocessingoftheacquireddatathatisthefunctionofthegeneratedvirtualinstrument.Asaconsequence,thevirtualinstrumentsarecharacterizedbytheirversatilityandlowcostbuttheylackofperformanceoftheapplicationorientedhardwarearchitectures.Inthispaper,wepresentavirtualinstrumentsystembasedonreconfigurablehardwarethatimprovesthefeaturesofvirtualinstrumentspreservingtheirversatilityandlowcost.
1.Introduction
Theemergenceofvirtualinstrumentationisarevolutioninthehistoryofthedevelopmentofmeasuringinstruments.Itfullyutilizesthelatestcomputertechnologytoimplementandextendtheinstrumentfunction.Usingtheimageofacomputerscreencanbeeasilysimulateavarietyofequipmentcontrolpanelstotheneedsexpressedintheformoftheoutputoftestresults.Usingcomputersoftwaretoachievemostofthesignaloftheanalysisandprocessingtocompleteavarietyofcontrolandtestfunction.Theuserthroughtheapplicationofgeneral-purposecomputerprogrammodulesandfeaturesofthehardwaretogether.Throughfriendlygraphicalinterfacetooperatethiscomputer.Asinoperatingtheirowndefinitionofindividualinstrumentsoftheirowndesigncanbemeasuredtocompletetheacquisition,analysis,determine,control,display,datastorageandsoon.
VirtualInstrumentsadvantagesofmoretraditionalinstruments:
(1)Astrongintegrationofcomputerhardwareresources.Breakingthetraditionalinstrumentsindataprocessing,display,storageandotherlimitations,andgreatlyenhancedthecapabilitiesoftraditionalinstruments.
(2)Theuseofcomputersoftwareresourcestoachievesomepartofthesoftwareofinstrumenthardware,savingmaterialresources,increasesystemflexibility.Throughsoftwaretechnologyandthecorrespondingnumericalalgorithm.Directlyonthetestdataforvariousanalysisandprocessingintime.Throughthegraphicaluserinterfacetechnology,trulyuser-friendly,human-computerinteraction.
(3)Hardwareandsoftwareofvirtualinstrumentisanopen,modular,reusableandinterchangeabilitycharacteristics.Therefore,theusercanaccordingtotheirownneedsandusedifferentmanufacturersproducts.Thedevelopmentoftheinstrumentsystemismoreflexible,efficientandshortentheformationtimeofthesystem
Thetraditionalinstrumentsareapplicationspecificsystemsbasedonfixedhardwareandsoftwareresourcessotheirfunctionandapplicationsaredefinedbythemanufacturer.Theseinstrumentsarecomplexsystemsandthereforetheybecomeexpensiveanddifficulttomanage.
Thewidespreadusageofpersonalcomputersinmanyscientificandtechnologicalfieldsmakethemanidealhardwareandsoftwareplatformfortheimplementationofmeasurementinstruments.Byaddingasimpledataacquisitionsystem,apersonalcomputercanemulateanyinstrument.Theinstrumentsgeneratedinthiswayarecalledvirtualinstrumentsbecausetheydonothaveexclusiveaccesstohardwareandsoftwareresources.Differentinstrumentscanbeimplementedoverthesamehardwarebyonlyreprogrammingthesoftware.Thevirtualinstrumentsofferplentyofadvantagesthemostimportantofwhichisthelowcostduetothereusabilityofhardwareandsoftwareresources.Theabovecharacteristicsandthecontinuousevolutionandcheapeningofthepersonalcomputersmakethevirtualinstrumentsavaluablealternativetotraditionalones.
Nevertheless,therearetwomainfactorswhichlimitstheapplicationofvirtualinstruments.Byonehand,thedatacaptureisreducetoslowratesbecauseofthemorecommonoperatingsystemsofthegeneralpurposecomputersarenotorientedtorealtimeapplications.Byotherhand,thedataacquisitionsystemisnotanapplicationorientedsystembutagenericone.Therefore,ourproposalisfocusedontheenhancementofvirtualinstrumentsbythereplacementofthegenerichardwarewithareconfigurabledataacquisitionsystem,asitisshowninFigure1.Bythisway,somedataprocesscanbeimplementedbyhardwarereducingthedataflowto/fromthecomputerandrisingthemaximumsamplerate.
Thebenefitsofvirtualinstrumentsbasedonreconfigurablelogicarethefollowing:
-Thebandwidthoftheinstrumentscanbeincreasedimplementingthemoretimecriticalalgorithmsbyhardware.
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