Item | Model |
---|---|
Observations | Undifferenced code and phase Ionospheric-Free (IF) combination observations |
Sampling rate | 300Â s (POD); 30Â s (PCE) |
Arc length | 1 d |
Elevation cutoff | 7° |
Weighting | Elevation-dependent weighting with priori accuracy of 0.003 cycles and 0.3Â m for raw phase and code observations |
Satellite antenna | igs14.atx (Rebischung et al., 2016) |
Receiver antenna | igs14.atx |
Ionospheric delay | IF combination eliminated 1st order effect; higher order not considered |
Tropospheric delay | Global Mapping Function (GMF); Saastamoinen model for dry hydrostatic delay; wet part estimated as piecewise constants |
Tide forces | Solid Earth tide, pole tide, ocean tide loading |
Relativistic effect | International Earth Rotation and Reference Systems Service (IERS) Conventions 2010 (Petit & Luzum, 2010) |
Phase wind-up | Correct (Wu et al., 1993) |
Geopotential | Earth Gravitational Model (EGM), 12 × 12 (Nikolaos et al., 2012) |
N-body gravitation | Sun, Moon and other planets; Jet Propulsion Laboratory (JPL) DE421 (Folkner et al., 2009) |
Solar radiation pressure (SRP) model | 5-parameter ECOM (Extend CODE Orbit Model, Arnold et al., 2015) for GPS/BDS/GLONASS; ECOM2 (D0, D2c, D2s, D4c, D4s, Y0, X0, X1c, X1s) (Prange et al., 2017) for Galileo |
Estimator | The least squares |
Station coordinates | Fixed to IGS weekly solutions |
Ambiguities | Estimated as constant value for a continuous arc |
Earth rotation | Estimate XPOLE, YPOLE, DXPOLE, DYPOLE, UT1, DUT |