Access Algorithm Research And Reliable Topology Designing In Aerospace Network

Aerospace network is consisted of satellites deployed in different orbits, performing different tasks, near space aircrafts, ground systems. It is a space and ground based comprehensive network connected through inter-satellite and satellite-ground links. Aerospace network can accomplish information collection, processing and transmission quickly and intelligently, has become the focus of the satellite and space science research for many countries.The service in aerospace networks is featured with short communication period, huge volume of data, and high demanding of data integrity, which needs the aerospace network to provide fast, reliable access performance. The access algorithms in existing terrestrial and satellite communication systems cannot meet the need of aerospace network. This thesis compared the access algorithm in existing terrestrial and satellite communications systems, combining the characteristics of aerospace networks, proposed an environment perception based algorithm for optimal access, considering the network load, routing hops and link survival time. Taking the complexity of the algorithm into account, this thesis proposed two sub-optimal access algorithm based on greedy algorithm and greedy and genetic combined algorithm, and made a simulation comparison of the above algorithms.Distributed satellite system has become an important research direction of aerospace networks for its high performance, low cost, high reliability and high adaptability. The current research of distributed satellite system focus on satellite key technologies, formation flying and autonomous operation, the reliable study of topology is quite limited. Due to the fact that small satellites are deployed in space, once spent, is very difficult to repair, which will make a significant impact on the entire distributed satellite systems. Therefore, this thesis studied reliable topology design in distributed satellite system. A reliable topology is proposed for distributed satellite system-double rings crossing redundant topology. By comparison with the existing topology, this thesis proved that the proposed topology is superior to traditional topology in information transmission capability, reliability and ease of realization of topological structure.