PrideLab published their research on determining observable-specific phase biases for all-frequency PPP ambiguity resolution. As a common sense, users should faithfully follow the frequency choices and observable combinations mandated by satellite clock and phase bias providers when resolving precise point positioning ambiguities. It makes things complicated when switching to three or more frequencies due to the non-compatible phase biases as wide-lane and narrow-lane combinations. Based on code observable-specific bias, we therefore develop an approach to compute observable-specific phase biases 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. Such phase and code OSBs could be corrected straightforwardly from raw GNSS measurements, and the integer properties of the resultant PPP ambiguities based on any frequency choices and observable combinations would be fully recovered, even though it was the legacy satellite clocks that were applied throughout.
For more details, please refer to the paper:“GNSS observable-specific phase biases for all-frequency PPP ambiguity resolution”
Fig 1. Code and phase biases over 30 days
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