基于虚拟仪器的信号发生器的设计与实现翻译Word文档格式.docx

基于虚拟仪器的信号发生器的设计与实现翻译Word文档格式.docx

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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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