Research On The Networking Technology Of The Large-scale Small Satellites Cluster

As an emerging space distributed system,small satellite clusters have the advantages of low cost,easy maintenance,and flexible configuration,and have received extensive attention and research from the aerospace industry.In the future,the scale of the small satellite cluster system will be larger and larger,and the tasks will become more and more complex.Therefore,building an efficient and reliable networking mechanism to ensure high-speed,reliable,and real-time data transmission has great scientific research value and practical application significance.This paper draws on the hierarchical network structure of the terrestrial wireless ad hoc network,and proposes a clustering networking scheme that is more suitable for large-scale small satellite cluster systems.The main research contents are as follows:First of all,the key technology,architecture and characteristics of large-scale small satellite cluster system are deeply studied,and related typical clustering algorithms and routing protocols based on clustering structure are discussed and analyzed,which lays the foundation for subsequent research and work.Then,in view of the characteristics and key issues of satellite cluster networking,a new adaptive distributed weighted clustering algorithm is proposed.In the cluster head election,the average connectivity of the nodes in the cycle,the maximum service capacity of the load,and the priority of the cluster head are comprehensively considered.The ground control terminal is initialized to calculate the comprehensive weight of each satellite and divide the cluster head and member nodes.After the calculation is completed,the Note to the satellite,and then the satellite nodes in the cluster will perform the maintenance process in a completely distributed manner based on their neighbors and their own information.Simulation analysis shows that compared with the minimum identification priority clustering algorithm and the maximum connection priority clustering algorithm,the cluster structure generated by this algorithm has fewer clusters,good stability,and can effectively balance the load of cluster head nodes.Finally,aiming at the shortcomings of single-path routing algorithm with poor stability and unbalanced load,a on-demand multi-path routing algorithm based on cluster structure is proposed.The algorithm quickly searches multiple paths that meet Qo S requirements through the cluster structure,and distributes traffic among multiple paths,optimizes paths through mechanisms such as path repair and local shortening,and reduces the number of re-initiated routing starts.Compared with the single-path routing algorithm,multi-path routing can reduce the routing overhead caused by frequent disconnection of the link frequency,and at the same time,the traffic load is distributed on multiple paths to solve the problem of limited satellite resources that easily cause congestion.Experiments show that the algorithm can effectively improve network quality and balance the traffic load of nodes in the network.