【作者】 宋娜；

【导师】 刘群；

【作者基本信息】 哈尔滨工程大学 ， 计算机软件与理论， 2005， 硕士

【摘要】 卫星网络作为一个新兴的研究领域越来越受到科研人员的关注。目前,对卫星网络路由协议的研究还处于探索阶段。由于卫星网络的特殊性,我们不能照搬地面固定网及地面移动网的路由策略,必须研究适合星间通信的新的路由策略。因此卫星网络路由协议是目前重要的研究课题。 本文在对OSPF路由协议进行分析的基础上,从卫星网与地面网的差异出发,提出了适合于双层卫星网络的SOSPF路由协议;通过对OPNET网络仿真软件仿真机制的研究,实现了SOSPF路由协议的仿真;通过分析实验数据对SOSPF协议性能进行评价。 在对双层卫星网络路由协议设计方面,以卫星网络的动态性和时变特性为基础,参考OSPF路由协议的路由计算方法,首先设计了SOSPF协议的路由算法;然后,以减少链路切换率为目标提出了路由算法的优化策略;最后,完成SOSPF协议中协议部分的设计。 在对路由协议仿真方面,本文详细分析了OPNET仿真软件的仿真机制,建立卫星网络的网络模型和节点模型,重点研究了进程模型,在此基础上实现了SOSPF协议的进程仿真建模;然后,通过实验测试协议的性能,验证SOSPF协议表现出良好的路由性能;另外,将采用优化策略的路由算法应用于模型中,验证了优化策略明显降低了链路切换率。 本文的研究成果可应用于双层卫星网络中,为网络层的数据传输提供路由交换技术的支持。更多还原

【Abstract】 As a new research field, more and more attention has been paid to satellite network by researchers. Currently, the research on routing protocol of satellite network is still in an early stage. Since the particularity of satellite network, we can not copy the routing policy of Internet and mobile network. New routing policy is needed to fit to the satellite communication. So, satellite network protocol has been the important research topic.After the analysis of OSPF routing protocol and the difference between satellite network and terrestrial network, a two-layered satellite network routing protocol SOSPF is proposed in the thesis. A simulation implementation ofSOSPF routing protocol is also presented. Based on the simulation, a performance comparison of SOSPF routing protocol is given by experiment.On the topic of two-layered satellite network routing protocol, a routing algorithm of SOSPF protocol is presented according to characteristic of satellite network at first. Then an optimized strategy of routing algorithm is presented to reduce the link switch ratio. Last, the part of protocol of SOSPF is finished.On the topic of routing protocol simulation, a simulation model of SOSPF routing protocol is implemented in OPNET according to its simulation mechanism. Through simulation experiment and result analysis, it is testified that the routing protocol has good performance. In addition, the optimized strategy of routing algorithm and is applied to the model, with the result of getting less link switch ratio.The result of this paper can be applied to double-layered satellite network, providing routing switch support for data transfer in network layer.更多还原