导航星座星间星地一体化数据交互技术研究

导航星座时分轮询建链体制星间链路与非时分固定建链体制传统星地链路，数据交互机制区别显著，不利于导航星座与地面联合数据交互的高效实现。提出利用与星间链路信号体制一致的星地链路，将星间链路范围扩展至地面，以少量的地面站资源和统一的网络规划，实现星间、星地链路数据传输处理机制统一化以及网络资源调度管理一体化的方法，可支持全球导航系统星-星-地数据的高效精准交互。制定了地面节点设计部署方案和星-星-地一体化资源调度方案；指出一体化网络拓扑规划的核心是境内卫星的建链目标分配，并给出境内卫星建链目标的优化排序方法和排序优先级策略；以最短路径路由方式为代表，定义了按照时间前向搜索传输路径的路由规划方法。通信性能仿真结果表明，相比于使用传统固定建链体制的星地链路，该方式下进行导航星座与地面数据交互的前向接入数据容量和传输时延等性能有明显提升。

Research on data interaction technology of navigation constellation satellite-satellite-earth integrated network

The data interaction mechanisms between the inter-satellite link based on time division polling chain-built mode and the fixed satellite-earth link are incompatible, which is not conducive to the efficient joint data interaction of navigation constellation and ground. It was proposed to extend the inter-satellite link to the ground by the satellite-earth link of the same signal system to realize the unification of satellite-satellite-earth data transmission and processing mechanism and the integration of network resources control with a small amount of ground station resources and unified network planning, enabling the satellite-satellite-earth data of efficient and accurate interaction. Firstly, the design and deployment method of the ground station and the integrated resource scheduling scheme were defined. Secondly, it was pointed out that the core of the integrated network topology planning is the distribution of the satellite chain, and the optimal ranking method and the ranking priority strategy of the domestic satellite chain were given. Represented by the shortest path routing, a route planning method was defined to search the transmission path according to time forward. Lastly, the communication performance simulations demonstrated higher performance of forward access data capacity and transmission delay between navigation constellation and ground of the approach proposed, compared with the traditional satellite-earth fixed link.