x(t)cos(2f(t)t0)

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1、MATECWebofConferences128,04009(2017)DOI:10.1051/matecconf/201712804009EITCE2017TheDesignofNonlinearChirpBasedontheDSPBuilderTechniqueDongZhang1,Shou-liangYang1,a,YangZhang21EngineeringResearchCenterofNewEnergyStorageDevicesandApplications,ChongqingUniversityofArtsandSciences,Chongq

2、ing402160,P.R.China2ChongqingPreschooleducationCollege,Chongqing404047,P.R.China)Abstract.Thispaper,byanalyzingthefunctionChirp,studiesthesoftwaredesignandrealizationofthefunction.ItoffersadesignplanbasedonthenonlinearChirpsignalofDSPBuildertechniqueanddesignsthesignalgeneratorofth

3、enonlinearChirpbasedonthedesignflowofMatlab/Simulink/DSPBuilder/QuartusⅡ.ItalsoconductssimulationverificationusingthedevelopmentsoftwareMatlab/SimulinkandQuartusII,provingthatthedesigncanwellrealizethesignalsourceChirp.TheexperimentprovesthattheDSPBuildertechniquecanmodifythestarti

4、ngfrequency,bandwidthandthefrequencyresolutionoflinearfrequencymodulationsignalsbychangingtheprogrammingparameters.Themethodisprovedtobesimpleindesigning,convenientinmodification,lowincostanditdoesn’tinvolveanyprogramming;therefore,itiseasytorealize.1IntroductionTheinstantaneousfre

5、quenciesofChirpchangewiththetime,i.e.,itisatimefunction.ItsmathexpressionisasThenon-linearFMpulsesignalsaretheoneswhosefollows.instantaneousfrequencieschangewiththetime,i.e.,thext()cos(2ftt())sinewaveswhoseinstantaneousfrequencieschangewith0(1)thetimeinarange1.Theyarewidelyus

6、edinsuchfieldsTheChirpfunctionscanbedividedintotwotypes:ascommunication,radar,sonarfortheirwonderfullinearchirpfunctionandnonlinearchirpfunctionbandwidthefficiency[2]3.ThestudyoftherealizationofaccordingtothegradationrulesoftheChirpoutputthewirelessfuzesignalsChirpinFPGAissignifica

7、ntforfrequenciescorrespondingtothesamplingtime.Thetheresearchofwirelessfuzesystem4.Thetestofstressfollowingtwodiagramsshowthetwochirpfunctions.wavesbasedonthetheoryofchirpsignalsiswidelyusedinengineerqualitynondestructivetesting.Alargenumberofexperimentshaveprovedthatthetestinginst

8、rumentsdevelopedonthebasis