GNSS applications

Computer science

Astronomy

Geography

Global Positioning System

Quantum mechanics

Galileo (satellite navigation)

Precise Point Positioning

Ambiguity

Telecommunications

Geodesy

Satellite

Ambiguity resolution

Phase (matter)

Observable

Remote sensing

Programming language

Physics

Pseudorange

Journal of Geodesy

An unwritten rule to resolve GNSS ambiguities in precise point positioning (PPP-AR) is that users should follow faithfully the frequency choices and observable combinations mandated by satellite clock and phase bias providers. Switching to other frequencies of measurements requires that the satellite clocks be converted, albeit in a roundabout way, to agree with the new frequencies of code biases. Satellite phase biases, on the other hand, are prescribed conventionally as wide-lane and narrow-lane combinations, which prevents users from resolving other phase combinations in the case of multi-frequency observables. We therefore develop an approach to compute observable-specific phase biases (phase OSBs) in concert with the legacy, but ambiguity-fixed, satellite clocks to enable PPP-AR over any frequency choices and observable combinations at the user end, i.e. , all-frequency PPP-AR. In particular, the phase OSBs on the baseline frequencies ( e.g. , L1/L2 for GPS and E1/E5a for Galileo) are estimated by decoup...

GNSS observable-specific phase biases for all-frequency PPP ambiguity resolution