GNSS for Lunar Surface Positioning Based on Pseudo-satellites

In this paper, it raised up setting pseudo-satellites to reduce the DOP values when positioning on the lunar surface using GNSS system. Take the location near the Central Bay of the Lunar as the research object and analyze the geometric accuracy factor when located on the lunar surface using the existing GNSS. Different number and position of pseudo-satellites are set on the lunar surface, this is compared with the positioning effect without pseudo-satellites. Computer simulation shows that the positioning accuracy is improved significantly when setting up one pseudo-satellite. The PDOP value can be reduced from thousands to about twenty. Adding the second pseudo-satellite has no obvious improvement compared with one pseudo-satellite even with optimization on the site selection. However, the PDOP value can be decreased greatly when adding the third pseudo-satellite with site optimization. It can reach 1.4, even better than the value of PDOP on the earth surface using GNSS satellites.