视函数法分析卫星覆盖研究

通过所建立的视函数法，得到了星座中每一颗卫星对地面的覆盖区和间隙区出现的时刻，各覆盖区和间隙区的长度、最大间隙出现的时刻等覆盖的详细信息；讨论了星座的覆盖性能指标，并建立了各项覆盖性能指标的计算方法。最后，对ＧＰＳ星座的覆盖性能进行了数值仿真，给出了ＧＰＳ星座的视函数图，并得到了ＧＰＳ星座在不同纬度的覆盖性能。

Research of the coverage performance of satellite constellation using visibility function

It is a very important task to estimate the coverage performance of satellite constellation in designing satellite constellation. In this paper, a numeric simulation algorithm of the visibility function is presented and used to evaluate the coverage performance of each satellite in satellite constellation including the time when coverage or gap occurred, the length of each coverage period and each gap period, the time when maximum gap occurred. Based on this, the statistical parameter of the coverage performance of satellite constellation is discussed, and the calculation method is developed. By means of this method, the coverage performance of GPS satellite constellation is calculated, and the constellation visibility graph of GPS is given, and the coverage performance of GPS in different latitude is obtained.