铁路隧道覆盖解决方案的分析研究.pdf

北京邮电大学工程硕士学位论文摘要隧道按截面分为圆形、矩形、拱形、椭圆等形状,按照长度分为短隧道、中等长度隧道、长隧道。不同种类不同长度的隧道在进行无线覆盖时必然采取不同的解决方案。因此,研究复杂截面隧道中电磁波传输特性及不同长度隧道的覆盖解决方案,对完善隧道无线传输理论、指导隧道移动通信系统建设具有十分重要的理论意义和使用价值。本文研究了隧道中电磁波传播理论,提出了各种隧道的无线覆盖解决方案。主要工作有: 把空隧道看作有耗介质管波导,系统的研究了电磁波在其中的自然传播特性,用波模匹配理论研究了铁路隧道中常见的拱形截面的电磁波传输特性。以往的射线跟踪/镜像法只是应用在室内无线环境中,本论文使用它来分析隧道中无线电波的传播特性。论文系统的分析了射线跟踪法的基本理论和射线跟踪/镜像法的基本原理,使用射线跟踪/镜像法研究了隧道中无线电波的传输特性。本文对隧道覆盖中涉及的信号源选择、天馈线分布方式选择进行了系统的归纳和研究,提出了不同长度隧道的典型解决方案。关键词: 隧道覆盖电波传播分布方式射线跟踪法北京邮电大学工程硕士 Abstract Alltunnels plex CROSS section with circular,rectangle,arch,ellipse shape,In accordance withthelength of thetunnel isdivided intoshort,medium length ofthetunnel,long oftunnelsofdifferentlengths during wireless coverage,they willnaturally take ,it is importance tostudy on propagation characteristic ic wave and solution ofdifferentlengthstunnel coverage in atunnel plex cross section andotherproblems,which have usefulmeaning andreality value toperfect tunnel wireless propagation theory and to guide the research on tunnel munication system. This dissertationmainly studies basic theory of ic wave propagation intunnel,put forward avariety of wireless coverage solutionsforthe conclusions andinnovative work are followed as: The tunnel filledwith airisdielectrictubewaveguide with lossinwhich natural propagation characteristic ic wave dissertation systematically discusses ic transmission characteristics according to“wave—mode matching theory'’about mon railarchshape tunnel. The dissertation USe aray-tracing/imageapproach,which used toapply toindoor wirelessenvironments,toanalyze theradio wave propagation characteristics intunnel environments,andsystematically discusses theprimaryprinciple ofthisapproach,by using ittoanalyse thewireless propagation characteristicoftunnel. The dissertation collateandstudy the source selection,antenna pattern of distributioninvolved intunnelcoverage,putforward differentsolutions tothetypical