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应答器上行链路信号接收系统的研究
Abstract
WiththedevelopmentofrailwayenterpriseandtheconstructionofthePassengerDedicatedLinesandthehigh—speedrailway,theimprovementoftherailroadtransportcapacityandtherailwaytransportationefficiencyhasalwaysbeenthemostconcerningissueintherailywaysystemonthebasisofthepresentrailywaylines.、ⅣhetherinTBTCorCBTC,balisehasbeenwidelyusedandplayedallinfluentialroleasoneofthetransmittinginformationmethodsbetweenthetrainsandthetracks.Atpresent,baliseusedinChinaisnotyetdomestic.Balisetechnologyfromabroadcanonlymeettheneedsofthedevelopmentofrailwayconstruction.However,thecoretechnologyofthebalisehasbeenmonopolizedbyforeigncompanies.Designingandmanufacturingofbalisewithourownintellectualpropertyhavevitalrealisticsignificanceandeconomicvalue.
Basedontheanalysisofthecomposition,sorts,principlesandapplicationofbalise,thisthesisfocusesOiltheresearchofbaiiseuplink-signalreceiversystem.WiththecurrentsituationofChinesehigh-speedrailwaytraincontrolsystem,thisthesisproposesanewbaliseuplink-signalreceiversystemprogram.Thisprogramisdividedintothreemodules:dataacquisitionmodule,datademodulationmodule,decodingmodule.Accordingtothefeaturesofuplink signal,theparameterssuchasthequantityoftransmittinginformation,carrierfrequency。demodulationschcme,therateoftransmittinginformationandthetransmissionbandwidthwillbedetermined.Be圮.ausetherearemuchmoreinterferencesignalsinreceiversystems,theinformationmodulationmodeandthechoiceofcarrierfrequencyarcespeciallyimportant.Concerningoftheperformanceandcomputationalcomplexityofseveraldemodulationalgorithms,thisthesisadoptsthedifferentialdetectionsolutiontransfermodeinthesignaldemodulation.Designofdigitalfilterisanimportantpartinsignalprocessing.,11璩band.pass,low.passanddelayfiltersarcinvolvedindifferentialdemodulation.删SalgorithmiscarriedoutbⅣMATIAB.日托differentialdetectionsolutiontransfermodewillbeverifiedinsimulationbyusingoftheSn仉,I,肿【t001.Meanwhile。ontheconcernofthenoiseenvironment.thefactorsthatinfluencethesimulationresultwillbeanalyzed.Onthebasisofhardwaredigitalsignalprocessingtechnology,thedifferentialdetectionmodeisusedtofinish2FSKsignaldemodulationslabdesigninthisthesis.
TIliSthesisanalyzesandresearchesintOtheCRC(CyclicRedundancyCheck)anddescramblingalgorithmofthebaliserecriverontheanalysisofthe同FFS(FormFitFunctionSpecification)codingstrategyofbaliseandthebasisofthetelegramdecodingstrategy.Accordingtocodingtheory,twomethodswillbeadoptedtoverify也e(汰C.Inaccordanceoftheprocessofscrambling,thedescramblingoperationatthereceivingsidewillbecarriedout.FPGAisusedtocompletethedesignofthebalisetelegramdecodingprogram.Andeach.Ⅱ.