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星间链路是卫星导航系统实现自主运行的一项关键技术.研究了一种Walker(24/3/2)星座,通过对卫星间可见性以及星间链路相关约束条件的分析,计算并确定了同轨卫星的A,B类排列方案,探索了建立位置精度因子(PDOP,Position Dilution Of Precision)值最小,即测距精度最高的星间链路拓扑结构的方法,并在此基础上利用Dijkstra算法计算出卫星之间以及卫星与地面站之间的最优路径.通过对星间数据传输时间延迟和星座网络卫星节点数据流量的统计,表明这种链路生成方案切实可行,能够满足预先设定的技术指标要求.同时对最短路径、最小跳数和网络流量均衡3种不同的计算策略进行了仿真,验证了这3种策略所造成的结果差异.
The inter-satellite link is one of the key technologies for satellite navigation systems to achieve autonomous operation. A Walker (24/3/2) constellation is studied. By analyzing the visibility between satellites and the constraints of the inter-satellite links, A and B arrangement schemes of the same orbiting satellites are determined, and a method of establishing a topology topology of the inter-satellite link with the smallest value of Position Dilution Of Precision (PDOP) and highest ranging accuracy is explored. Based on this, Dijkstra algorithm was used to calculate the optimal path between satellites and satellite and ground station.Through the statistics of the data transmission time delay between the satellite and the satellite node data flow of the constellation network, it shows that this link generation scheme is feasible and can satisfy Pre-set technical requirements.At the same time, three kinds of different calculation strategies, such as the shortest path, the minimum number of hops and the network traffic balance, were simulated and the results of these three strategies were verified.