Abstract: Considering the issue that dynamic relative positioning of the BDS system rarely takes GEO orbital characteristics into account, this paper analyzes the spatial signal quality and observation value quality of GEO satellites. By considering GEO orbital characteristics, the stochastic model is improved based on inter-station single-difference residuals and a downweighting factor. The positioning performance is verified and analyzed under the conditions of excluding all GEO satellites and excluding some GEO satellites. The experimental results show that considering the GEO orbital characteristics, excluding some GEO satellites, and improving the stochastic model can ensure the number of observed satellites, enhance the ambiguity resolution rate, and improve the accuracy of dynamic relative positioning.

Key words: GEO satellites, RTK, BDS, stochastic model