AIS系统基带信号的研究与DSP实现

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1、电子科技大学硕士学位论文AIS系统基带信号的研究与DSP实现姓名：刘毅申请学位级别：硕士专业：通信与信息系统指导教师：陈天麒20060101ABSTRACTBythedevelopmentofmodemshippingtransportation，aequipment，whichcallautoresponseandidentify，isespecialbenefitforoceanshippingsecurity、trafficcontrollingandmaritimeenvironmentsurveilling．Tilisdissertation．basingonsimulatio

2、n，makesadeepresearchonsimulatingsignalofGMSK(GaussianfilteredMiulmunFrequencyShinKeying)basebandmodlllafionanddemodulationinAIs(AutomaticIdentificationSystem)equipment：ThetechnologyrelatedinthefollowingmakesthemodulationanddemodulationofbasebandsignalintorealizationbvTIDSP．atthesametime，providesa

3、keytechniquetodevelopAISsysteminland．SignalforminganddiffcrentdemodulationofGMSKbasebandsignalaremainlydiscussedinthedissertation．GaussFilter,phaseintegral，SINtable,matchedfilter,calculateangle．bit-syncMoulzation、outputfilter、A／D、D／AandeteofGMSKbasebandsignalarecare血llystudiedthroughsoftwareemula

4、tioninSYS田巳l讧VⅢWenvironment．ThemodulationanddemodulationofGMSKbasebandsignalarecarriedoutbythewayofusingTMS320VC549ofntointegratesoftwareandhardware．Thes3rstemwhichcombinewithFPGA．hasmanycharactersofflexiblestrucRkre、morevcTsamity、beingliabletomaintainandupgrade．Suchdiathesismadeitsuitableforbloc

5、kingdesignandrealtimesignalprocessing．Amonglotsof址Ssoftwareprotocols．thecourseofhowmessage1inITU。1371produce、packedandcodeisparticularlyinvestigatedinthisarticle．nleoutputofHDLCdatapackagewascodedbvNRZI．thenconductsthemodulationofGMSKbasebandsignalthrou曲DSP．ThemessagewascorrectlyanalyzedbysABBrec

6、eNer，whichprovedtheintercomlectionandintercommunicationbetweenapparatus．AwayofusingoneFLASHtobootfourDSPwasdiscussedinBOOTofthesystem．Accordingtothemodehavingbeensetted，theina$terDSPloadprogr锄throughexternalparallelinterface．ControlledbyhostDSP．TheslaveDSPloadstheprogramthroughHPI．111eelectrocirc

7、uitofthismodeiscomparativelysimple．andcancutthecost．buthavesomecomplexitytocarryingout．Afterthesystemhasmanyfactured，anecessarytestedwasperformedonthebasebandboard．nlequalityofsignaliswellenoughtocommunicatewithotherAJ