PPP with GPS/GLONASS data Integration: Fundamentals Involved and Accuracy Assessment

Currently GNSS has GPS and GLONASS operating, which enables the integration of these systems in geodetic positioning. The integration of GPS/GLONASS data provides better geometry and greater reliability in the estimation of the involved parameters. By applying the integration in the positioning it is necessary to perform the compatibility of the time system and also of the Geodetic Reference System, in case of applying broadcasted orbits. In terms of geodetic positioning special attention has been given nowadays for the PPP method that requires a single receiver at the user level, precise orbit and clock corrections for satellites, as well as mathematical modeling capable to correct for several effects involved in the GNSS signals propagation and the geodynamic effects in the station. In this paper it will be presented the adjustment mathematical model for PPP with integration of GPS/GLONASS data, as well as analysis of positional accuracy involving data collected by receivers in Brazilian stations. The data processing was carried out by using the GPSPPP NRCan software considering daily solutions with generation of annual time series. Analyses were performed in terms of daily Root Mean Square and improvements were observed reaching up to 25% in the position estimation when applying GPS/GLONASS in the PPP instead of only GPS data

Keywords:
GNSS; GPS and GLONASS integration; PPP