Reseach On Key Networking Technologies Based On Multiple Satellites Collaboration In Space Information Network

As the extension of ground network and satellite system, Space Information Network can provide integrated communication service to multiple space missions because of the its advantages such as wide coverage, flexible networking, not restricted by geographical environment and so on. However, with the development of information and communication services, the networking capacity of Space Information Network is highly required to ensure that Space Information Network can provide more comprehensive range of services and higher quality services. So this paper is themed on researching the key networking algorithms, such as structure design, topology control and access control, etc, so that the performance of Space Information Network could be improved.In this paper, on the basis of the research status, the characteristics of the Space Information Network are analyzed, and the significance of the satellite collaboration is also emphasized. And the relationships between constellation structure design and networking, multiple topology routing and networking, access control and networking are also expounded, what’s more there are also some innovative research results.On the basis of analyzing the principle of satellite constellation network structure design, in this paper a kind of construction of GEO/MEO/LEO constellation structure is put forward. The simulation scene is structured in STK, and the contrast scenes:LEO single-layer structure and MEO single-layer are also structured. In this paper, the proposed constellation coverage performance and link duration performance are analyzed.In this paper, a task oriented space information network topology routing algorithm is designed. Multiple sub-topologies are set according to the QoS demands of different tasks and the node busy degree of the space nodes, and the tasks rout in their own topologies and transmit the data packets. The simulation scene is designed in OPNET, according to the research result, it can be seen that the throughput performance, transmission delay performance and the link utilization performance are all improved.In this paper, an adaptive backoff algorithm based on S-ALOHA using Grey System is proposed, which calculates the backoff time adaptively according to the network conditions. And the network conditions are estimated by each user terminal according to the prediction of the channel access success ratio using the Model GM(1,1) in Grey system. The proposed algorithm is compared to the other known schemes such as the Binary Exponential Backoff (BEB) and the Multiple Increase Multiple Decrease Backoff (MIMD). The performance of the proposed algorithm is simulated and analyzed. Research results show that throughput of the system based on the proposed algorithm is better than of system based on BEB and MIMD. And there are also sorme improvements of delay compared to using BEB. And the proposed algorithm is especially effective for large number of user terminals in the satellite networks.