微波射頻識別技術(shù)研究.pdf

1、西安電子科技大學(xué)博士學(xué)位論文微波射頻識別技術(shù)研究姓名：尹應(yīng)增申請學(xué)位級別：博士專業(yè)：電磁場與微波技術(shù)指導(dǎo)教師：劉其中龔書喜20020409ABSTRACTFortherequirementsofremoteinformationmanagementandmobilebusiness，themicrowaveradiofrequencyidentification(RFID)technologyisstudiedinthisdissert

2、ationwiththeautomatictrainidentificationsystemoftheNationalMinistryofRailroadasabackgroundThefundamentalsassociatedwithRFIDsysteminthefieldofelectromagneticsandcommunicationsaresummarizedandthetechnicalessenceiSpointedou

3、tattheviewpointofsystemdesignThemaincontributionsoftheauthor’SareasfollowFirstlythefirstvisualreaderortagdetectorisdevelopedsuccessfullyTheperfomlancedetectionandanalysisofthetagsarerealizedThereaderiSintegratedwiththefu

4、nctionsofmicrowavetransmitterreceiverdatacollector，digitalsignalprocessing(DSP)，spectrumanalyzerfieldstren【gthmeter，andencodingThisachievementisappraisedbytheNationalMinistryofRailroad，whichfillsthenationalblankandreache

5、stheleadinglevelintheworldThisproducthasbeenappliedinpracticeSecondlyamicrostripantennausedinportablereaderandthetwonoveltagantennaswhichareadual—banddipoleantennaandacircularpolarizedmicrostripantennaaredevelopedTheanal

6、ysisanddesignoftagdetectorarepresentedThecharacteristicsofthetagareimprovedandthetagobtaineduseinpracticeNext，thetechniquesofDSPwithhigh—speedandhigh—accurateandfloatingpointprocessingaresuccessfullyappliedintheareaofmic

7、rowaveradiofrequencyidentificationThismakesreal—timecollectionandFFTtransforillanddisplaypossible，andthetag’SperformanceisanalyzedquantificationallyintimedomainandspectraldomainMoreoverthecancelingtechnologyoftwomicrowav

8、esignalswithsamefrequencyisappliedinmicrowaveRFIDsystemfirstlyandthemethodforimprovingtheisolationbetweenthetransmittingchannelandreceivingchanneliSobtainedTheisolationofthereaderisincreasedformorethan30dBbyseveralexperi

9、mentsFinallySomemethodsofdigitalprocessingtechniques，suchaspolynomialcurvefittingandexponentialcurvefittingandsubsectioncurvefitting，areusedfirstlytocompensatetheperformanceofthedetectorThemeasurementaccuracyofthereaderi