星座覆盖性能评估的改进网格点仿真法

卫星星座覆盖性能指标评估的快速性对星座优化设计有重要的意义。根据改进的网格点仿真法，得到星座中每一颗卫星对地面点的覆盖时刻集；建立了一套卫星覆盖时刻集的合并方法，并给出了根据星座覆盖时刻集计算覆盖性能指标的方法。最后对Molniya轨道卫星星座进行了仿真，分析了星座在纬度线上的多重覆盖性能指标分布，以及不同数量卫星和网格点对计算时间的影响。仿真结果表明了改进网格点仿真的有效性和快速性。

Improved Grid Simulation for Constellation Coverage Performance Evaluation

In satellite constellation design, the rapid evaluation of the coverage performance is of great importance. The improved grid simulation is based on the in-view period determination. The in-view period is calculated from the satellite rise and set instants. It has been shown that the in-view period computation algorithm allows the rapid selection of a constellation with the desired performance. As an example, a Molniya orbit constellation entailing 3 satellites is investigated in detail. The coverage performance is given and the influence of the number of satellites and points is discussed. The operation of the sample was shown to be reliable and rapid.