搜索
厦门大学博硕士论文摘要库厦门大学博硕士论文摘要库厦门大学博硕士论文摘要库I摘要随着海洋探测、水下观察、潜艇对潜通信等水下应用领域对通信技术的需求和要求不断提高，构建高数据传输速率的水下通信系统成为了一个新技术课题，当前，水下无线光通信技术以其具有极高的信息承载能力和传输速率等优势，吸引了不少科研组织和研究人员的投入。本课题的提出正是出于水下应用领域对通信技术的需求日益增加的背景下，研究对象是水下无线光通信系统的相关技术和发射与接收系统设计。本论文首先对当前国内外研究现状进行了较深入的分析了解，其次对水下无线光通信系统的相关知识进行了理论概述，介绍了蓝绿激光的海水信道特性，对比了当前较常见的几种水下通信方法，分析了水下无线光通信的几项较关键的技术，昀后完成了系统的相关设计，并对应用于语音传输的通信系统进行了实验。在水下无线光通信系统设计中，提出了一套基于连续激光器的系统设计方案，采用的是连续蓝光模组TTL调制发射的方式，AMBE-1000低速率语音编码，由单片机控制处理，高速光电探测器进行信号接收与转换，通过信号的恢复处理实现了语音传输，并对该系统的水下传输实验进行了相关测量和分析。在此基础上，提出了另一套基于脉冲高功率激光器的设计方案，并根据脉冲激光输出的特点，对发射信号的“归零”处理和接收信号的放大整形处理进行了相关设计研究。针对适用于水下无线光通信的光源设计研究，提出了一种掺Pr3+:YLF声光调Q固体激光器的设计方案，并对其进行了可行性分析。关键词：水下无线光通信；蓝绿激光；AMBE；归零码；声光调Q厦门大学博硕士论文摘要库IIIAbstractTheneedanddemandforcommunicationtechnologyhavebeenimprovinginmanyunderwaterapplications,suchasoceanexploration,underwaterobservationandsubmarinecommunication,buildingahighdatatransmissionrateofunderwatercommunicationsystemhasbecomeanewtechnologyproject.Atpresent,theunderwaterwirelessopticalcommunicationtechnologywiththeadvantagesofhighinformationcapacityandtransmissionrate,attractedmanyresearchorganizationsandresearchers.Thisprojectisjustunderthebackgroundofincreasingdemandfortheunderwaterapplicationrangeofcommunicationtechnology.Theresearchobjectistherelevanttechnologyofunderwaterwirelessopticalcommunicationsystemandthedesignoftransmit/receivesystem.Firstlythispaperdescribedthecurrentresearchstatusathomeandabroadin-depthknowledge,secondlyhascarriedonthetheoreticaloverviewoftheunderwaterwirelessopticalcommunicationsystem,introducedtheblue/greenlaserchannelcharacteristicunderwater,comparedthecurrentcommonlyusedmethodofunderwatercommunication,andanalyzedthekeytechnologyofunderwaterwirelessopticalcommunication,finallyhascompletedtherelevantdesignofthesystem,andhasproceedtheexperimentalstudyforvoicetransmission.Inthedesignofunderwaterwirelessopticalcommunicationsystem,wehaveputforwardasetofsystemdesignschemebasedoncontinuouslaser,whichusedabluelightmodulewithamodulationwayofTLLastransmitter,AMBE-1000forlowratespeechcoding,STC89C52formicrocomputerprocessing,high-speedphotoelectricdetectorforreceivingandconvertingthesignal,andrealizedthevoicesignaltransferthroughtherecoveryprocessofthereceivedsignal,andthen,wehavedonetherelatedmeasurementandanalysisoftheunderwatertransmissionexperimentbythissystem.Basedonthis,wehavedesignedanotherschemewhichbasedonahighpowerpulselaser,andaccordingtothecharacteristicsofpulselaseroutput,wehavecarriedontherelateddesignresearchontheprocessingofemissionsignalbyreturnzeroandtheamplificationplasticprocessingofthereceivedsignal.Aimedatthestudyoflightsourcedesign,whichwassuitablefortheunderwaterwirelessopticalcommunication,wehavecomeupwiththedesignofanacoustoopticallyQ-switchedPr3+:YLFdopedsolidstatelaser,andhavecarriedthroughthefeasibilityanalyzed.KeyWords:underwaterwirelessopticalcommunication;blue/greenlaser;AMBE;RZ;acoustoopticallyQ-switched厦门大学博硕士论文摘要库V目录摘要..........................................................................................................................................I第1章绪论............................................................................................................................11.1引言................................................................................................................................11.2研究背景.......................................................................................................................11.3国内外研究现状..........................................................................................................21.3.1国外水下无线光通信现状............................................................................31.3.2国内水下无线光通信现状............................................................................81.4本课题研究目标........................................................................................................101.5研究的主要内容........................................................................................................10第2章水下无线通信系统概述................................................................................122.1引言..............................................................................................................................122.2蓝绿激光海水信道特性..........................................................................................122.2.1海水的光吸收.................................................................................................122.2.2海水的光散射.................................................................................................132.2.3海水中的激光传输特性...............................................................................142.3现行的几类水下无线通信方法............................................................................152.3.1水声通信..........................................................................................................152.3.2低频无线电波通信........................................................................................162.3.3水下电磁耦合无线通信...................................................