非对称战术数据链组网协议研究及系统建模仿真

【作者】 曾勇；

【导师】 李绍荣；

【作者基本信息】 电子科技大学 ， 电路与系统， 2007， 硕士

【摘要】 本文根据战场通信覆盖和数据分发的需求,用空中平台作为超视距战术通信的中继平台,构成非对称数据传输系统,对系统体制、通信协议和数据分发调度算法等进行了研究,并进行了系统仿真。论文的主要内容有:1.基于超视距通信的传输体制及结构分层概念,研究了包括数据链路层、ip层和tcp层的五层数据链传输机制模型及各层所具备的功能;并对非对称数据链网络的网络运行模型进行了阐述。2.研究了无线非对称链路,根据战术通信对信息服务优先权的特殊要求,提出了一种“动态优先级轮询”MAC层调度算法,在点播模式下,可提高非对称广播信道数据的传输效率,并对链路操作过程进行了详细的分析。3.分析了基本TCP/IP作为系统传输层协议用于无线非对称环境下存在的问题。研究了一种把物理层链路和传输层相结合处理往返时间(RTT)的方法:物理层链路采用与信道相关的动态RTT,传输层采用常数RTT,消除了两层RTT之间的相互干扰,从而提高了无线链路的利用率;利用和修改TCP层的零窗口机制,改善了连接断开的性能;研究了IP层分组格式,编址方案及多网结构下的路由寻址算法。4.对现今较流行的仿真软件OPNET进行功能介绍,对无线信道建模进行了阐述。5.提并建立了非对称战术数据链的网络拓扑,建立了空中平台、地面节点的模型,状态转移图以及在仿真中所用到的应用层业务配置。对非对称战术数据链进行了流程和功能上的仿真,并对结果进行了分析,给出了结论。更多还原

【Abstract】 Motivated by the increasing request of providing the battlefield data dissemination and communications relay, we presents the design of an aerial vehicle platform’s applications of tactical communications for providing beyond-line-of-sight(BLOS) communications capability. Providing a description of the aerial vehicle platform’s development, we conduct a deeply study on the wireless asymmetric data link structure, communication protocols and the algorithm of data dissemination. and carried on the system to emulate.The main works can be summarized as follows.1.The transfer architecture of the aerial vehicle’s BLOS communication is studied. Based layered structure, we studied a five layer data link model, which includes mac layer, ip layer and tcp layer.etc.and the function that each layer have.2.A wireless asymmetric physical layer link model is studied. To meet the requirement of the information service priority, we presented a dynamic priority scheduling algorithms, which working on the order programming mode, can improve the efficiency of the asymmetric broadcast channel.3.The problems of wireless asymmetric network applications using the original TCP/IP as system transport layer protocols is studied and analyzed.We consider the Round-trip time(RTT) with the physical layer and the transfer layer combined together. Physical layer using RTT related to the channel state and transfer layer using the constant RTT, the interference between the two layers can be eliminated, and so the effectiveness of the wireless data link can be enhanced. The grouping of IP layer.Addressing precept and the routing arithmetic under many networks is studied.4.The simulation software OPNET is introduced, the modeling of wireless channel is illuminated.5.A wireless asymmetric data link structure model is studied. Building up the model of the aerial vehicle node.CGS node and the estate transfers diagram and the application layer operation configuration used in simulation.更多还原