Analyses of GLONASS and GPS+GLONASS Precise Positioning Performance in Different Latitude Regions

The orbital inclination angle of the GLONASS constellation is about 10° larger than that GPS, Galileo, and BDS. Theoretically, higher could provide better observation geometry in high latitude regions. A wealth research has investigated positioning accuracy its impact on multi-GNSS, but rarely considered contribution constellation’s large orbit angle. performance different regions evaluated both stand-alone mode integration with GPS this paper. also presented for comparison. Three international GNSS service (IGS) networks located high, middle, low latitudes are selected current study. Multi-GNSS data between January 2021 June used assessment. quality check shows integrity significantly lower GPS. visibility analysis indicates a much elevation distribution Both daily double-difference network solutions static Precise Point Positioning (PPP) evaluated. statistical coordinate estimates that, regions, comparable or even GPS+GLONASS presents best estimate accuracy; middle provides offers worst accuracy, tropospheric do not present resemblance regional advantage as estimates, which worse all three networks. PPP processing combined observations reduces convergence time improves