Articles | Volume 15, issue 4
Research article 21 Apr 2015
Research article | 21 Apr 2015
Accuracy of velocities from repeated GPS measurements
V. Akarsu et al.
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Huseyin Duman and Dogan Ugur Sanli
Nat. Hazards Earth Syst. Sci., 19, 571–582,Short summary
Research has been done to assess the performance of relative positioning over long baseline lengths in determining the accuracy of site velocities from GPS campaign measurements. GPS campaign measurements were generated from the IGS data, and the results were compared with PPP-derived findings. A major outcome of this study is that relative positioning over long baseline lengths produces similar accuracies to PPP. A newly proposed refinement method also improves the available PPP accuracy.
Deformation rates obtained using repeated GPS measurements from as short as 8--12h are severely biased. GIPSY processing results from a global GPS network revealed that 60--70% of the horizontal and 100% of the vertical velocities are not usable. GIPSY processing is equivalent to relative positioning in which the baseline lengths to reference stations are at several hundred kilometers. This scale requires that the session length for GPS campaigns needs to be no shorter than 24h.
Deformation rates obtained using repeated GPS measurements from as short as 8--12h are severely...