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1、西安理工大学硕士学位论文II万方数据abstractTitle:THEIMPACTANILYSISOFTHESPECTRUMANDITSINFLUENCEONOPTICALTRANSMISSIONCHARACTERISTICSOFMOVINGMEDIAMajor:CommunicationandInformationSystemName:WeiYangSignature:Supervisor:Prof.XizhengKeSignature:AbstractAsaresultofrain,snowandothermedia'smove
2、ment,wirelesslasercommunicationsubcarriersignalatreceivingendwillhaveaDopplerfrequencyshiftandaspectrumbroadening,whichwillaffectthedemodulationofmodulatedsignal,especiallyinthedemodulationofhigh-ordermodulatedsignal.Furthermore,whenthelaserpropagatesinthemovingmedia,t
3、hemovingmediawillaffecttheopticaltransmissioncharacteristics.Theimpactofthespectrumanditsinfluenceonopticaltransmissioncharacteristicsisanalyzedinthisarticle,themainworkareasfollows:1Basedonthespectrumfunctionofmovingscatterer'stimecorrelationdifferentialscatteringcros
4、ssection，theDopplerfrequencyshiftandspectrumbroadeningcharacteristicsofrainfallandsnowfallisanalyzedbyusingnumericalcalculation,anditisverifiedbyusingtheexperimentaldata.2Basedonthetheoryofopticalpropagationinthemovingmedia,takingtheatmosphericmovementinMartiansurfacea
5、sanexample.howthepermittivity,permeabilityandrefractiveindexofthemedia,thewavelength,thewavevelocityandtheenergydensityofthelaserchangewiththeanglebetweentheopticalpropagationdirectionandthedirectionofthemedia'smovementisanalyzedbyusingnumericalcalculationwhenthelaserp
6、ropagatesinmovingmedia;Thechangeofopticalpropagationdirectionisanalyzedbyusingnumericalcalculation.Theresultsshowthat:1)TheamountofDopplerfrequencyshiftisproportionaltothefallingspeedofraindrops,snowflakes,andthewavelengthbecomesinverseratio.Andthegreatertheinclination
7、angleofopticalpropagation,thegreatertheamountoftheDopplerfrequencyshiftwillbe,thegreaterthespeedfluctuation,themoreseriousofspectrumbroadeningeffect.2)Someinherentpropertiesofthemediaandthelaserwillchangewiththeanglebetweentheopticalpropagationdirectionandthedirectiono
8、fthemedia'smovement,andcomparedwiththestationarymedia,therewillbedeviations,andthebiggerthespeedofthemedia'smovement,
