星地一体化导航系统星问链路仿真及分析

在导航卫星系统中，为了解决星间链路拓扑规划不合理而导致的星地信息传输时延大的问题，提出了一种新的星间链路规划方法。该方法优先考虑星地间的可视覆盖关系，保证卫星与地面站之间实时的信息传输。利用STK仿真软件构建了卫星网络拓扑，进而利用OPNET仿真软件完成了性能仿真验证。仿真结果表明，新的拓扑减小了星地数据传输的跳数和端到端时延，符合星地一体化的需求。

Simulation and Analysis on Inter-Satellite Links of Satellite-Earth Integrated Navigation System

A novel inter-satellite links （ISLs） algorithm is proposed to solve the increase problem of satellite -to-earth transferring delay caused by unreasonable ISLs topology planning in the navigation satellite sys- tem. The algorithm pays the utmost attention to the satellite-earth visual coverage, and ensures the real- time information transmission between the satellites and the ground stations. The satellite network topology is constructed with STK simulation software, and the performance simulation completed with OPNET simulation software. The simulation result indicates that the new topology could reduce the satellite-to-earth transfer- ring hops and end-to-end delay, and thus meet the demand of satellite-earth integrated system.