From: GNSS rapid precise point positioning enhanced by low Earth orbit satellites
Items | Model and strategies | ||
---|---|---|---|
PPP float solution | PPP-AR solution | PPP-RTK solution | |
Frequency selection | GPS/LEO: L1/L2; BDS-2/BDS-3: B1I/B3I; Galileo: E1/E5a; GLONASS: G1/G2 | GPS/LEO: L1/L2; BDS-31: B1I/B3I; Galileo: E1/E5a; | GPS/LEO: L1/L2; BDS-3: B1I/B3I; Galileo: E1/E5a |
Sampling interval | 30Â s | 5Â s | 5Â s |
Estimator | Kalman filtering | Kalman filtering | Kalman filtering |
Cut-off elevation angle | 7° | Float: 7° Fix: 10° | Float: 7° Fix: 10° |
Phase ambiguities | Constant estimation | Constant estimation and ambiguities fixed with WL2/NL3 | Server: Constant estimation and ambiguities fixed with WL/NL User: Constant estimation and ambiguities fixed with WL + N1/N24 |
Station coordinates | Estimated as constants in static mode | Estimated as constants in static mode | Server: Constraints, estimated as constants in static mode User: Estimated in dynamic mode |
Observations | IF observations of carrier phase and code observation | IF observations of carrier phase and code observation | Server: IF observations of carrier phase and code observation User: UCUD phase and code observation |
Ionospheric delay | Eliminated by IF observations | Eliminated by IF observations | Server: Eliminated by IF observations User: Constraint, Estimated by random walk |
Tropospheric wet delay | Estimated by random walk NMF mapping function | Estimated by random walk NMF mapping function | (1) Server: Estimated by random walk with NMF5 mapping function(2) User: Constraint, Estimated by random walk with NMF mapping function |
Satellite orbit and clock | Precise products | Â | Â |
Satellite and receiver antenna phase center, Tropospheric dry delay, and other modelable errors | Model correction | Â | Â |