面向高轨空间的北斗导航性能增强星座选型研究

由于高轨空间超出北斗卫星导航系统的正常服务区域，导航信号微弱、可见性差，难以实现高轨飞行器全程稳定可靠的导航定位服务。提出了以空间卫星为时空基准传递平台，向高轨空间区域发射导航信号，从而提高高轨飞行器导航性能的方法，并展开面向高轨空间的北斗导航性能增强星座选型研究。基于卫星可见性、精度衰减因子（DOP）、信号接收门限和所需增强卫星数目等评估指标，仿真分析了基于LEO星座、MEO星座和HEO星座的北斗导航增强性能。

Research on BeiDou navigation performance enhancement constellation selection for high-orbit space

As in the high-orbit space which exceeds the normal service area of the BeiDou navigation satellite system, the navigation signal is weak and the visibility is poor, and it is difficult to achieve stable and reliable navigation and positioning services for high-orbit aircraft. A method for improving the navigation performance of high-orbit vehicles is proposed by using space satellites as a space-time reference transmission platform to transmit navigation signals to high-orbit space areas, and the selection of BeiDou navigation performance enhancement constellation for high-orbit space is carried out. Based on the evaluation indicators of satellite visibility, dilution of precision (DOP), signal reception threshold and number of required enhanced satellites, the enhanced performance of BeiDou navigation based on LEO constellation, MEO constellation and HEO constellation is simulated and analyzed.