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1、外文文獻(xiàn)ADAQcardbasedmixedsignalvirtualoscmoscopeAbstractComplexsignalsfindmanyapplicationsinSONAR,RADAR，EchoLocationSystemsandforstudyingtheresonantfrequencies.DigitalStorageOscilloscopcs(DSO)isusedthesedaysforacquisitionanddisplayofroutinesignals.Thisinstrument,foundineverymeasureme
2、ntlaboratory,thoughpotentindisplayingsimpleperiodicwaveformslikesinusoidsfailswhenfrequency-varyingtimesignalsareapplied,Thisproblemsurfacesbecausetheunderlyingtechniqueofoscilloscopeusedtotriggerthewaveformdoesnotacquiescewithcomplexsignalslikechirp.Readysolutiontothisproblemisth
3、emixedsignaloscilloscope.Thisisacostlysolutionandsmalllaboratoriescannotaffordtohavethecostlyinstruments.Inthispaper,acosteffectiveDAQcardbasedmixedsignalvirtual0scilloscopeisproposedtostudythecomplexsignals.Anintelligenttechnique,WeightedHammingDistance(WHD)algorithmwasusedtoaccu
4、ratelytriggerthecomplexwaveforms.Alsoforfrequencydomainanalysis,JointTimeFrequencyAnalysis(JTFA)techniqueswereused.ALabVlEW'TMbasedvirtualinstrumentwasdesignedanddevelopedwithacapabilitytoacquire,displayandanalyzethetriggeredsignal.TheintegratedprogramminglanguageLabVIEWTMwaschose
5、nasitoffersmanysimplereadytousefunctions.Inawaytheproposaloffersacosteffective,fastandflexiblesolutiontotreatthecomplexsignals.Theneedtocreatesuchsolutionsistheconsequenceofcostlyhardwaresystems.Thedeficiencyofconventionalhardware.Schemeforthevirtualoscilloscopeforcomplexsignalswi
6、thsomerealtimeexperimentalresultsarepresentedinthiswork.Kevywords:Virtualinstrumentation,Chirpsignal,Dataacquisition,Triggering,Complexsignals,JTFA1.IntroductionForthelasttwodecadestherehasbeenatremendousprogressincomputertechnology.Measurementdomainisnolongerleftunaffected.Theway
7、measurementsarebeingdoneistotallyrevolutionized.Computerbasedmeasurementorsayvirtualinstrumentationisgraduallyreplacingthecostlybenchtopinstrumentationasitoffers25flexible,fastandcosteffectivesolutions.VariousclassicalinstrumentationsystemsnamelyOscilloscope,MultimetersandSpectrum
8、analyzersect.arealmostphasedoutby
