面向大规模低地球轨道卫星网络的星间链路连接策略OA北大核心CSTPCD

For large-scale low earth orbit(LEO)satellite networks,two new inter-satellite link(ISL)connection strate-gies named Grid-V and Grid+were proposed,which improved the traditional Grid connection strategy.The proposed strategies made full use of the ISL connected to adjacent and cross-adjacent orbits.The Grid-V connection strategy aban-doned the intra-orbit links of the Grid connection strategy and used ISL of the adjacent and cross-adjacent orbits to form the network topology.The Grid+connection strategy,while retaining the Grid connection strategy,allowed satellites to establish cross-satellite connections with satellites in the same orbit or the cross-adjacent orbits.For the large-scale LEO satellite network with a Walker-Delta constellation configuration,a shortest distance inter-satellite routing algorithm was designed based on the proposed ISL connection strategies,and system-level simulations were conducted from the per-spectives of geometric topology and packet respectively to evaluate the performance of each connection strategy.Simula-tion results show that,from the perspective of geometric topology,the proposed strategies can effectively reduce the aver-age number of routing hops and path switches.At the packet level,the proposed strategies exhibit better performance in terms of round-trip time and jitter,path occupation ratio,average throughput and so on.