Precise point positioning using dual-frequency GPS and GLONASS measurements

This thesis presents a comprehensive study on Precise Point Positioning (PPP) using combined GPS/GLONASS dual frequency code and carrier phase observations. The existing PPP technique is implemented using only GPS measurements, which will be restricted from use in some situations such as in urban canyons and open-pit mine areas due to insufficient satellite number. In addition, the positioning accuracy and convergence time of PPP need to be further improved. A good strategy is to integrate GPS and GLONASS.;In this research, a combined GPS/GLONASS traditional PPP model and a combined GPS/GLONASS U of C PPP model are developed, including their functional and stochastic models. The combined GPS and GLONASS PPP models have been implemented in a new version of the P3 software package. The performance of the combined GPS and GLONASS PPP is assessed using static data from IGS tracking network and kinematic data from an experiment. Numerical results indicate that the positioning accuracy and convergence time have a significant improvement after adding GLONASS observations. A further improvement can be expected when a full GLONASS constellation is completed in the near future. The stability of the GPS-GLONASS system time difference is investigated in the thesis. Recommendations for future work are also addressed.