Research On GEO/LEO-based Double Layer Satellite Networks Routing Algorithm

With the increasing requirements on informationalization of society, we are no longer content with the construction of information highways on earth, but more attention has being paid to the space information infrastructure development. With the extended space information requirements and heavy space information dependence, space strength and information have been convinced to be the strategy resources. Routing is the basic problem in the design of space-based networks, and is one of the research focuses nowadays. Routing technology has special meaning for increasing the delay performance and reliability performance of data traffic transmission. Despite that the routing problem has been resolved effectively in terrestrial networks, many new challenges exit for routing in space-based network due to highly dynamic topology, very limited on-board processing capabilities, large propagation delay of inter-satellite links and unbalanced traffic load carried in the network. Based on the analysis of the technology challenges for routing in space-based network and the limitation of related work, this dissertation focuses on resolving the problem of routing algorithms designing for space-based networks in double layer networking architectures.Considering periodicity and foresee of satellite network, the routing algorithm can be optimized applying the thinking of dynamic programming. Routing handoff and delay jitter dramatically decrease in the course of data transmission after applying optimized thinking. Considering the characteristic of double layered satellite networks based GEO and LEO, this dissertation bring forward an invulnerable hierarchical routing strategy based satellite group and cluster, furthermore, it apply increment message technology to reduce routing control overheads. And design the mechanism of gusty incident when satellite networks dynamic change. At last, on the topic of constellation simulation, with the purpose of acquiring appropriate parameter value, we select STK as software solution. On the topic of routing algorithm simulation, we select OPNET as software solution, through simulation experiment and result analysis, it is testified that the routing algorithm has a good performance. In addition, a performance comparison is made out by simulation, with the result of the double-layered constellation and the routing algorithm being better.This research is an exploration of network simulation for satellite network routing strategy. And this paper bring forward a routing algorithm based on"three managing strategy of satellite networks, two processing mechanism, and a optimized resolvent".The result can be applied in the satellite network research, providing simulation support for protocol implementation and performance analysis.