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1、西北工業(yè)大學(xué)碩士學(xué)位論文水聲通信編碼與同步技術(shù)研究姓名：王平申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：張效民20030301AbstractInthepast10years，therapiddevelopmenthashappenedinthestudyofunderwateracoustic(UWA)communicationtechniques，withmoreattentiontotheunderwateracousticcommunicationsystems．Thedissertationbeg
2、inswiththeintroductionoftheunderwateracousticcommunicationsystem，andiscompactlydevotedtothestudyonthesynchronizationandcodingtechniquesinunderwateracousticcommunication，basedontheanalysisofthecharacteristicsofUWAchannels．ThethreemaincharacteristicsofUWAchann
3、elsarestudiedthoroughly，andtheirinfluenceontheUWAcommunicationsystemarecompletelyanalyzed．AimedatthefeaturesoftheUWA，theLFM(1inearfrequency—modulated)pulsesynchronizationisproposed，inwhichLFMistheframesynchronizationsignal，andrealizeaccuratesynchronizationby
4、usingreplicacorrelationinreceivingend．TheLFMpulsetimedelaycodingmethodisalsoproposedindissertation，whichincreasesthespeedoftransmittingsignalinUWA．TheUWAmodulatorytechniquebasedonFrequencyShiftKeying(FSK)issystematicallyandin—depthstudied．AssociatedwiththeLF
5、Mflamesynchronizationmethod，thethreemethods：periodogrammethod，Welch’Smethodandhigher-ordercumulantmethodarecompletedanalyzed．IncombinationwiththecharacteristicsofUWA，DifferentialPhaseShiftKeying(DPSK)isstudied．Thetwodemodulationmethods：differentialdemodulati
6、onmethodandcrossspectrademodulationmethodaredeeplystudied．WiththeLFMpulseframesynchronizationmethod，theperformanceofUWAcommunicationsystembasedonDPSKisapparentlyimproved．Keywords：UnderwaterAcousticDigitalCommunicationUnderwaterAcousticchannelFrameSynchroniza
7、tionLinearFrequencyModulated(LFM)PulseTimeDelayCodingFrequencyShiftKeying(FSK)DifferentialPhaseShiftKeying(DPSK)2墮!!三些查蘭堡!蘭笪笙苧——————————————————————．!絲序言第一章緒論近幾年來，隨著海洋開發(fā)事業(yè)的發(fā)展，各種數(shù)據(jù)信息，如遙測數(shù)據(jù)、水下機(jī)器人和海上石油平臺(tái)的遙控?cái)?shù)據(jù)、水文站的采集數(shù)據(jù)等等，對利用水聲信道和水聲通信系統(tǒng)進(jìn)行傳送的要求大為增加。水聲通信應(yīng)用范圍的增大使得對系
8、統(tǒng)的信息量和性能的要求也隨之增加，國內(nèi)外已經(jīng)開展了大量的工作著重研究怎樣擴(kuò)展系統(tǒng)的帶寬和如何提高數(shù)據(jù)的傳輸率上，這些研究主要集中在編碼調(diào)制技術(shù)和抑制多徑干擾的信號(hào)處理方面。本文正是在這樣的情況下，結(jié)合國防十五重點(diǎn)預(yù)研課題“水聲遙控技術(shù)”而提出的。1．1水聲信道和水聲通信技術(shù)簡介海水介質(zhì)是一種導(dǎo)電介質(zhì)，向海洋空間輻射電磁波會(huì)被海水介質(zhì)本身所屏蔽，其大部分能量會(huì)以渦流的形式被損耗掉，因此電
