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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