POD Processing Models and Parameters
| Item | Description |
|---|---|
| Dynamic models and Stochastic accelerations | Gravity field: Earth Gravitational Model (EGM 2008) (Pavlis et al., 2008) |
| Tidal corrections: FES2014b (Lyard et al., 2021) | |
| Relativity: International Earth Rotation and Reference Systems Service (IERS 2010) (Petit & Luzum, 2010) | |
| Planet ephemeris: Jet Propulsion Laboratory (JPL DE421) (Standish, 1998) | |
| Velocity changes (pulses) and piecewise constant accelerations | |
| Observation model | Observation model: Ionospheric-free linear combination of 1-Hz GPS code (C1, C2) and phase (L1, L2); Stochastic model: SNR-based weighting model (Allahvirdi-Zadeh, El-Mowafy, & Wang, 2022) |
| Eclipsed observations: Removed using the shadow model (Allahverdi-Zadeh et al., 2016) | |
| Code and phase standard deviation: 0.1 m and 1 mm (Zenith, L1) | |
| Satellite attitude information: Obtained as quaternions | |
| Antenna phase center offset: [0.0021, 0.0011, −0.0223] m for L1 [0.0033, 0.0034, −0.0125] m for L2 | |
| Antenna phase center variation pattern: Residual approach (Allahvirdi-Zadeh, 2021) | |
| Phase ambiguities: Fixed by applying observable-specific signal biases (Schaer et al., 2021) |