Table 3 PPP strategies based on BDS SBAS corrections
Item | Strategies |
|---|---|
Data span | 13–19 May, 2020 |
Frequencies | B1 and B3 |
Observations | Dual-frequency: IF combinations and UdUc models Single frequency: UdUc model |
Estimator | Kalman filter |
Data sampling rate | 30 s |
Elevation cutoff angle | 10° |
Satellite orbit and clock | Broadcast ephemeris |
Satellite TGD | Corrected using parameters in broadcast ephemeris |
Real-time corrections | BDS SBAS corrections |
Tropospheric delay | SHAtropE |
Ionospheric delay | Dual-frequency: eliminated for the IF model; estimated for the UdUc model Single frequency: ionospheric grid corrections |
Relativistic effects | Corrected by model |
Phase windup | Corrected by model |
Tidal effects | Consider solid tides, ocean loading and polar tides (IERS2010, Gerard and Luzum 2010) |
Weighing strategy | Elevation-dependent weighing |
Station Coordinates | Static: estimated as constants Kinematic: estimated as white noises |
Receiver clock | Estimated as white noises |
Phase ambiguities | Estimated as float constant for each arc |