基于OPNET的星地光网络性能测试仿真平台研究

Research on Space-ground Optical Network Performance Testing Simulation Platform Based on OPNET

为了测试星地光网络的性能,设计了一种基于OPNET的星地光网络性能测试仿真平台;介绍了平台的总体技术架构,探讨了星间链路建立的条件;采用最大接入仰角与最长服务时间加权的方式,完成星地链路的卫星接入服务;按照切换呼叫优先的策略完成业务传输中的卫星切换服务,确保星地链路不间断的通信能力;根据最小链路代价和首次命中原则,实现星地光网络的路由与波长的动态分配;最后,利用平台的OPNET软件测试了3种星座下的星地光网络性能,测试结果表明:在LEO、MEO和GEO星座下,星地光网络的网络阻塞率分别为10%、40%和54%,平均网络时延分别为0.1s、0.07s和0.054s;测试结果对星地光网络的工程应用具有一定的指导意义。

In order to test the performance of space-ground optical network, a space-ground optical network performance testing sim- ulation platform based on OPNET is designed. The total technology framework of the platform is introduced, and the establishment condition of link between stars is discussed. The satellite access service of space-ground link is accomplished by adopting weighted method of maxi mum access elevation and longest service time. The satellite switching service in the operation transmission is achieved by according to the strategy of switching call priority, which can ensure the uninterrupted communication capabilities of space-ground link. According to the principle of minimum link cost and First-Fit, the dynamic route and wavelength allocation is realized. Finally, the performance of space- ground optical networks of three kinds of constellations are tested by utilizing OPNET software of the platform. The results of the testing demonstrate that under the constellation LEO , MEO and GEO, the network blocking probability of space-ground optical network respec- tively is 10%, 40% and 54%, and the average network delay respectively is 0. 1 second, 0.07 second and 0. 054 second. The testing results have a certain guiding significance to the engineering application of space-ground optical network.