Table 5 The detailed processing setups for PPP–RTK
From: Investigating GNSS PPP–RTK with external ionospheric constraints
Item | Strategy |
|---|---|
Float PPP | Global Positioning System (GPS), GLObal NAvigation Satellite System (GLONASS), Galileo navigation satellite system (Galileo) and BeiDou navigation satellite system (BDS) |
Ambiguity fixed | GPS |
Frequency | L1 and L2 |
Weight strategy | Elevation dependent |
Priori precision | 0.3 m for code observation 0.03 m for phase observation |
Tropospheric delay | Without external tropospheric information constraints Saastamoinen model (Saastamoinen, 1972) for hydrostatic component Estimated as random walk for zenith total tropospheric delay Global Mapping Function (GMF) (Boehm et al., 2006) is used as tropospheric mapping function |
Ionospheric delay | With external ionospheric information constraints Server: zero-differenced integer ambiguity fixed method Users: constrained by network corrections using inversed distance weight |
Elevation cutoff | 10° |
Satellite DCB | Corrected with the monthly satellite DCB products provided by CODE |