Abstract
Combining the observation data from five Multi-GNSS Experiment (MGEX) stations with the precise orbit and clock products from Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS), we studied the model of combined GPS/BDS precise point positioning, and then analyzed the convergence speed and short-time (6 h) positioning accuracy. The calculation results show that in static positioning, the average convergence time of GPS is about 50 min, and its horizontal accuracy is better than 2 cm while the vertical accuracy is better than 4 cm. The convergence speed of combined GPS/BDS is about 40 min, and its positioning accuracy is close to that of GPS. In kinematic positioning, the average convergence time of GPS is about 72 min, and its horizontal accuracy is better than 5 cm while the vertical accuracy is better than 12 cm. The average convergence time of GPS/BDS is about 57 min, and its horizontal accuracy is better than 3 cm while the vertical accuracy is better than 9 cm. Combined GPS/BDS has significantly improved the convergence speed, and its positioning accuracy is slightly than that of GPS.
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