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Table 2 The estimable parameters of un-differenced and un-combined PPP–RTK and corresponding formulations

From: Investigating GNSS PPP–RTK with external ionospheric constraints

Parameter Formulation
\(\overline{{{\text{d}}t}}^{s}\) \({\text{d}}t^{s} - {\text{d}}t_{p} + [B_{{{\text{IF}}}}^{S} - B_{{p,{\text{IF}}}} - g_{r}^{s} \cdot T_{p}^{s} ]/c\)
\(\overline{B}_{i > 2}^{s}\) \(B_{i}^{S} - B_{{{\text{IF}}}}^{S} - \mu_{i} B_{{{\text{GF}}}}^{S} - B_{p,i} - B_{{p,{\text{IF}}}} + \mu_{i} B_{{p,{\text{GF}}}}\)
\(\overline{b}_{i}^{s}\) \(b_{i}^{S} - B_{{{\text{IF}}}}^{S} + \mu_{i} B_{{{\text{GF}}}}^{S} - b_{p,i} - B_{{p,{\text{IF}}}} + \mu_{i} B_{{p,{\text{GF}}}} - \lambda_{i} N_{p,i}^{S}\)
\(N_{r \ne p,i}^{s \ne q}\) \((N_{r,i}^{S} - N_{p,i}^{S} ) - (N_{r,i}^{q} - N_{p,i}^{q} )\)
\(\overline{T}_{r \ne p}^{s}\) \(T_{r}^{s} - T_{p}^{s}\)
\(\overline{{{\text{d}}t}}_{r \ne p}\) \({\text{d}}t^{s} - {\text{d}}t_{p} + [B_{{{\text{IF}}}}^{S} - B_{{p,{\text{IF}}}} ]/c\)
\(\overline{B}_{r \ne p,i > 2}^{{}}\) \((B_{r,i} - B_{{r,{\text{IF}}}} - \mu_{i} B_{{r,{\text{GF}}}} ) - (B_{p,i} - B_{{p,{\text{IF}}}} - \mu_{i} B_{{p,{\text{GF}}}} )\)
\(\overline{b}_{r \ne p,i > 2}^{{}}\) \((b_{r,i} - B_{{r,I{\text{F}}}} + \mu_{i} B_{{r,{\text{GF}}}} + \lambda_{i} N_{r,i}^{q} ) - (b_{p,i} - B_{{p,{\text{IF}}}} + \mu_{i} B_{{p,{\text{GF}}}} + \lambda_{i} N_{p,i}^{q} )\)
\(\overline{I}_{r,i}^{s}\) \(I_{r}^{s} + B_{{r,{\text{GF}}}} - B_{{{\text{GF}}}}^{S}\)