65. Feasibility Analysis of GNSS Multi-constellation Positioning for Lunar Spacecraft

With the development of deep space exploration technology, as the representative project of the Chinese lunar exploration, the possibility of using global navigation satellite system (GNSS) for deep space exploration spacecraft positioning has become a hot issue. Based on the existing GNSS research on high orbital spacecraft positioning, the feasibility of using GNSS multi-constellation for lunar orbit spacecraft positioning is deep analyzed. On condition of signal acquisition’s lowest carrier to noise ratio (CNR) threshold, 21 dB Hz, two cases of signal receiving are analyzed from which GNSS satellite transmitting antenna beam’s main lobe and side lobe. Simulation results show that when only receiving the beam main lobe signal of GNSS transmitting antenna, any single constellation or multi-constellation combination of GNSS cannot satisfy positioning of lunar spacecraft on the lunar revolution orbit for whole period (about 27 days). When signals from the main lobe and side lobe of the GNSS received, three constellations combination or more can satisfy positioning for the whole lunar orbit period. Conclusion is that GNSS multi-constellation combination method is possible to complete the mission of deep space exploration project for lunar spacecraft positioning on the simulated conditions.