Table 4
Experimental processing strategies.
| Items | Strategies |
|---|---|
| Observations | IF: GPS L1/L2 ionosphere-free combination of code and carrier phase UDUC: GPS L1/L2 raw observations |
| Sampling rate | 30 s |
| Elevation cutoff | 10° |
| Observation weight | Elevation-dependent weight (Zhou et al., 2018) |
| Orbits | real-time QZSS L6 correction precise orbits |
| Satellite clocks | real-time QZSS L6 correction |
| Tidal loadings | IERS conventions (2010) and FES2004 model (Petit & Luzum, 2010) |
| Ionospheric delay | IF:Ionosphere-free combination mode UDUC: Estimate |
| Satellite antenna phase center correction | IGS20.atx |
| Receiver antenna phase center correction | IGS20.atx |
| Antenna phase wind-up correction | IGS model (Kouba, 2009) |
| Parameter estimation | Extended Kalman Filter (EKF) (Takasu & Yasuda, 2009) |
| Receiver coordinates | Estimate |
| Receiver clock | Estimate |
| Inter-system bias | Estimate |
| Ambiguities | Estimate, float |
| Tropospheric delay | Estimate ZTD and horizontal gradients (Niell, 1996) |
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