Study On Evaluation Of Satellite Network Topology Survivability And Node Importance

With the advancement of space technology, satellite network technology has been rapidly developed,which making human social activities can’t leave the support of satellite network.The huge developing potential and broad market space attractting a number of scientists to research it. Human has already recognised the importance of satellite network topology, a good satellite network topology not only has good coverage,connectivity, but also can reduce the communication latency and increase network stability. Different from the ground networks, satellite network topology changes frequently that results network topology generation algorithms which suitting ground networks can not be applied to the satellite network. Therefore, designing a invulnerability, good network performance, suitable for the satellite network topology is important.This paper first introduces the satellite network,and some characteristics of the satellite network are analyzed in detail. then through the existing satellite network topology assessment method and analysis of satellite network node importance evaluation method,From the high dynamic characteristic of satellite network analysis, A method of network topology evaluation and a method for evaluating the importance of satellite network nodes based on node centrality is presented. Simulation results show that these two algorithms can achieve the ideal effect.The innovation of this work and the research results:(1)Aiming at high dynamic characteristics of satellite network topology, In view of the existing network topology survivability hop plane nodes based on the method of evaluation method to the problem of low degree of similarity topological structure is not high. A new method is proposed to access the survivability. The method defines a new correction factor, in theory, an analytical expression of the nodal method and its improved method is proposed,and this method is suitable for satellite network topology survivability evaluation of high dynamic.(2)Put forward the concept of close centrality, can accurately react to the degree of nodes close to the center of the network. A network node evaluation method based on close centrality is proposed, the method is a simple and accurate assessment method. But the same number of nodes can effectively distinguish the importance of nodes two network topologylink number in different changes, this method is applicable not only to the ground network,but also for the same number of nodes, high dynamic satellite network link in frequent changes, and evaluate the more accurate evaluation results can provide constructive suggestions to enhance the survivability of the whole satellite network.