Summary of Research on Satellite Cooperative Transmission Technology in Space Information Network

With the increasing demand for high-speed transmission of space information, space communication networks based on satellite cooperation are widely used in ocean communications, emergency rescue, spacecraft tracking, and deep space exploration. Aiming at the characteristics of complex network structure, dynamic topology, unstable transmission quality, and the resulting transmission time extension, high bit error rate, poor connectivity, etc., the satellite-based system is analyzed from three aspects: network architecture, collaboration strategy, and working frequency. Cooperative space information transmission technology has been researched and prospected. From the perspective of network architecture, the future space communication network is gradually moving toward a multilayer three-dimensional network, and the structure will evolve to a more flexible spatial self-organizing mesh network structure; from the perspective of network components, there are inter-satellite links and on-board Cooperative satellites with processing functions will increasingly become the most basic and important component of future space communication networks. At the same time, by analyzing different collaboration strategies and working frequency bands, it can be seen that adaptive transmission of spatial information based on high frequency bands and cross-layer joint optimization will become the main means to ensure reliable and effective transmission of spatial information, and it will also realize the integration of space, space and ground in the future. An important technical approach for intelligent communication.