Table 2 Correction models and parameter estimation strategy
Items | Strategy | |
|---|---|---|
Models | Observation | LC + PC(Zero-Differential) |
Interval and arc length | 300 s | 1 day | |
Cutoff elevation | 7\(^\circ \) | |
Troposphere model | Saastamoinen (DRY) (Liu et al. 2017) | estimated (WET) | |
Solid tide; Ocean tide; Pole tide | IERS convention (2010) (Petit and Luzum, 2010) | |
Satellite antenna Phase Center Offset (PCO) Receiver antenna PCO | Phase Center Variance (PCV) Mapping function | IGS14.ATX (update to 2020) add with BDS PCO from CSNO/TARC The same with corrections to GPS Global Mapping Function (GMF) (Böhm et al. 2006) | |
Site coordinates(priori) | IGS14(psd) (1sigma) | |
SRP model Shadow model | SRPM (bw + 5ECOM) (Xi et al. 2018) 3dishes/PPM/PPMatm/SOLAARS-CF | |
Ionospheric | 1-order removed by LC/PC; higher order corrections of the model (Xi and Wang 2021) | |
Earth Radiation Pressure | Considered | |
Thermal Radiation Pressure | Considered | |
Antenna thrust | Considered | |
Parameters | Orbit | Estimated |
Satellite clock | Estimated | |
Receiver clock | Estimated | |
Ambiguity | Zero-differenced ambiguity resolution | |
Earth orientation parameter | Estimated \({\mathrm{x}}_{p}\), \({y}_{p}\), \(\dot{{x}_{p}}\), \(\dot{{y}_{p}}\), Length of Day (LOD) | |
Tropospheric parameter | Zenith troposphere delay and gradient parameters are estimated as piecewise constant with 1 h |