Table 3 Data processing strategy and model for multi-GNSS PPP
Item | Strategies & Models |
|---|---|
Estimator | All the Multi-GNSS observations are processed together in one common least square estimator |
Observations | Raw carrier phase and pseudorange observations; BeiDou + Galileo + GLONASS + GPS, 74 satellites in orbits |
Signal selection | GPS: L1/L2; GLONASS: L1/L2; BeiDou: B1/B2; Galileo: E1/E5a |
Sampling rate | 30 s |
Elevation cutoff | 7° |
Weight for observations | Elevation dependent weight |
Satellite orbit | Fixed |
Satellite clock | Fixed |
Earth rotation parameter | Fixed |
Phase-windup effect | Corrected |
Station displacement | Solid Earth tide, pole tide, ocean tide loading IERS Convention 2003 |
Satellite antenna phase center | Corrected using MGEX and IGS values |
Receiver antenna phase center | Corrected |
Station coordinates | Estimated in both static and kinematic modes |
Phase ambiguities | Estimated as constant for each arc |
Tropospheric delay | Initial model + random-walk process |
Ionospheric delay | Estimated as parameters with constraints of equation (12) |
Receiver clock | Estimated, white noise |
ISB and IFB | Estimated as constant, GPS as reference |
