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空间信息网节点都暴露于空间的复杂环境,导致其很容易遭受攻击,出现卫星或链路的故障或失效,从而影响空间信息网通信的可靠性。因此,提出一种基于跳面节点与petri网的空间信息网可靠性评估算法,完成了可靠性评估指标的建立、可靠性评估两部分。构建petri网评估模型,在此模型上建立单颗卫星的静态拓扑并组建跳面。利用petri网跳面节点计算网络的连通可靠度,评估连通可靠性和抗毁性。在业务可靠性评估过程中,利用基于选择复制的动态数据传输算法,采集petri网评估时所需数据,通过petri网中变迁置信度计算,对业务可靠性评估。仿真结果表明,算法能够有效评估空间信息网的可靠性,为构建可靠性较高的拓扑、保证数据的可靠传输提供有力的依据,可以有效避开故障部位或拥塞区域,提高了网络的抗毁性。
Spatial information network nodes are exposed to the complex space environment, leading to its vulnerability to attacks, satellite or link failure or failure, thus affecting the reliability of the space information network communications. Therefore, this paper proposes a space information network reliability assessment algorithm based on jump nodes and petri nets, and completes the establishment of reliability evaluation index and reliability evaluation. Construct a petri net evaluation model, in which a static topology of a single satellite is established and a surface of jump is established. Petri nets nodes are used to calculate the connectivity reliability of the network to evaluate connectivity reliability and survivability. In the process of business reliability assessment, the dynamic data transmission algorithm based on selective replication was used to collect the data needed for the evaluation of petri net. The reliability of the business was evaluated through the change confidence calculation in petri net. The simulation results show that the algorithm can effectively evaluate the reliability of the spatial information network and provide a strong basis for the construction of highly reliable topological and reliable data transmission, which can effectively avoid the fault location or congested area and improve the anti-destruction of the network Sex.