IGS repro3 products by Graz University of Technology (TUG): Solutions and normal equations

Next to GPS, which spans the full period, GLONASS was introduced into the solutions starting from 2009 and Galileo from 2013. Solutions and normal equations are given at a daily sampling period. TUG's contribution to repro3 was computed using the open-source software GROOPS.

The processing included all available stations from the proposed repro3 station list (1212 stations), reaching more than 800 stations per day in the mid-2010s. All available code and phase observations on all frequencies (except Galileo E6) have been used at the full 30-second sampling period. The following background models and corrections were used during the processing: Earth rotation: IERS 2010 plus high-frequency EOP model (Desai and Sibios, 2016) Earth's gravity field: GOCO06s plus C20 replacement from SLR Moon, Sun and planet ephemerides: JPL DE421 Solid Earth tide: IERS 2010 Ocean tide: FES2014b Pole tide: IERS 2010 (linear mean pole) Ocean pole tide: Desai (2004) (IERS 2010, linear mean pole) Atmospheric tides: AOD1B RL06 Relativistic corrections: IERS 2010 Tropospheric corrections: VMF3 Solar radiation pressure: Box-wing + ECOM2 Earth radiation pressure: Box-wing Antenna thrust: Steigenberger et al. (2017)