A comparison between GPS-only and combined GPS+ GLONASS precise point positioning

The benefits and challenges of a combined GPS and GLONASS Precise Point Positioning (PPP) system in post-processed static and kinematic modes are analysed and identified. Different elevation cut-off angles are applied to simulate satellites' availability in different sky view conditions. The results show that for kinematic PPP, the addition of GLONASS observations could speed up the solution convergence time and improve the accuracy and precision of the position estimates. However, for daily static PPP, the benefits of integrating GLONASS to the current GPS-only PPP system are marginal as the 24-hour cumulative satellite coverage is nearoptimal with the current GPS constellation.