Research on NRHO-Based Lunar Global Positioning System

In order to meet the increasing requirement of lunar global positioning services for future lunar exploration and exploitation missions, the Lunar Global Positioning System (LGPS) using the Near Rectilinear Halo Orbit (NRHO) as a reference orbit is proposed. First, multiple constellation configuration schemes are designed, considering configuration parameters such as orbit distribution, satellite number, orbit size, etc. Then, the impact of different constellation configuration parameters on the navigation performance of the LGPS constellation is analyzed, including the number of visible satellites, the lunar global coverage characteristics and the Geometric Dilution of Precision (GDOP, $ {\sigma }_{\mathrm{G}\mathrm{D}\mathrm{O}\mathrm{P}} $). Simulation results show that, compared with the Halo orbit case, the NRHO-based LGPS is superior in the continuous coverage and positioning accuracy ($ {\sigma }_{\mathrm{G}\mathrm{D}\mathrm{O}\mathrm{P}} $ < 3) within the lunar high latitude region, especially in the lunar polar region. This study can provide technical reference on the navigation and positioning service for future lunar exploitation missions.