As the era of lunar exploration dawns anew,to ensure real-time,high-precision positio-ning for future lunar missions,significantly enhance the autonomy of lunar spacecraft and reduce their dependence on Earth-based stations,it is particularly important to select suitable orbits for constructing a lunar navigation constellation and achieve synchronization of communication links between the lunar navigation constellation and the Earth's GNSS.To assess the performance of satellites receiving GNSS signals in lunar navigation constellation orbits,simulations of four types of orbits—elliptical lunar frozen orbit(ELFO),near-rectilinear halo orbit(NRHO),prograde cir-cular orbit(PCO)and low lunar orbit(LLO)—are conducted.Along with simulations of GNSS satellite signals based on antenna pattern metrics,the visibility of GNSS by satellites in these four types of orbits is evaluated based on simulation results such as main and side lobe beam width and signal-to-noise ratio.Results show that NRHO and ELFO orbits provide better visibility of the GNSS constellation,with the highest visibility time proportion reaching 99.57％.This ensures stable reception of GNSS signals for the majority of the time,facilitating the correction of orbit and clock of lunar navigation constellation satellites and guaranteeing positioning performance of the orbit.
关键词
月球导航/全球导航卫星系统/可见性/载噪比
Key words
Lunar navigation/Global navigation satellite system(GNSS)/Visibility/Signal-to-noise ratio
维普
万方数据