Summary of the processing strategy and correction models depending on the adopted positioning model.
|Parameter||PPP positioning||RTK positioning|
|Functional model||SF-IF PPP||ionosphere-float kinematic relative positioning|
|Observation||GRAPHIC LC of GPS carrier-phase and pseudorange||DF DD carrier-phase and pseudorange|
|Observable weighting scheme||An elevation-dependent scheme based on the cosecant function|
|Zenith-referenced a priori sigma of observables||Pseudorange 30 cm; carrier-phase 3 mm|
|Elevation cut-off angle||10°|
|Sampling interval||30 s|
|Satellite orbits and clock products||Precise final provided by IGS|
|Receiver clock||Estimated as a white noise-like parameter||Eliminated due to double-differencing|
|Satellite code biases handling||Corrected with CODE products (Villiger et al., 2019)|
|Tropospheric delay handling||A priori corrections from Saastamoinen’s (Saastamoinen, 1973) model and GMF mapping function (Boehm et al., 2006); Wet Zenith Tropospheric Delays are estimated|
|Ionospheric delay handling||Eliminated with GRAPHIC LC||DD ionospheric delays are estimated as loosely constrained parameters|
|Ambiguity handling||Estimated as float constants over each continuous observation arc||estimated and fixed to integers with MLAMBDA (Chang et al., 2005) and validated with W-ratio (Wang et al., 1998)|
|Parameter estimation method||Kalman filter|
|Station coordinate handling||Static||Kinematic|
|Antenna phase center offsets and variations||Corrected with Antex igs14.atx (Rebischung et al., 2016)|
|Relativistic effects, tides, phase wind-up effect||Corrected (Kouba, 2015; Wu et al., 1992)|
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