北斗掩星事件数量与分布的模拟研究

北斗卫星导航系统作为我国自主开发的卫星导航系统,在掩星探测领域有着广泛的应用前景.文章针对利用LEO星载掩星接收机进行北斗掩星探测的任务,在建立LEO卫星轨道模拟系统和北斗全星座模拟系统的基础上,通过仿真计算研究了不同LEO轨道参数条件下北斗掩星事件的特点.分析了对于单颗LEO卫星,北斗掩星事件的数量和分布随LEO轨道参数包括轨道近地点角距、升交点赤经、轨道高度和倾角而变化的规律.针对北斗导航系统由GEO、IGSO和MEO三种轨道卫星组成的特点,对不同类型北斗卫星的掩星事件进行了研究,并分别总结了三种轨道北斗卫星掩星事件的特点.研究结果对利用北斗导航系统进行掩星探测有参考作用.

Simulation of number and distribution of Compass occultation events

As a China's self-developed satellite navigation system, Compass has broad application prospects in the field of radio occultation. Focused on the task of carrying out Compass occultation observations with a receiver set on LEO satellite, this work developed a simulation system of LEO orbit and Compass constellations, based on which the occultation events can be simulated taking into account different LEO orbit parameters. The effect of LEO satellite's orbit parameters on occultation events' number and distributions are discussed considering argument of perigee, right ascension of ascending node, orbit height and inclination. Occultation events for different types of Compass satellites, including GEO, IGSO and MEO, are analyzed individually. The characteristics of all three kinds of Compass satellite occultation events were summarized. The results can serve as a reference when the Compass navigation system is used in detection of radio occultation.