[G05-2] Single- and Multi-GNSS

[G05-2-06] High-rate RTK and PPP for precise dynamic displacements determination

^○Jacek Paziewski, Rafal Sieradzki, Radoslaw Baryla, Pawel Wielgosz (University of Warmia and Mazury in Olsztyn)

The measurement method applied for the monitoring of the ground and engineering structures' displacements ought to satisfy the highest requirements in terms of accuracy, reliability and availability. These specific demands may be met by the GNSS technique and suited method of signal processing. High precision and availability of high-rate GNSS observations predestine this technology to be applied to the most demanding applications such as small-scale dynamic displacements determination. Thus, GNSS positioning may be used as a reliable source of information on dynamic, different origin deformations, also in real time applications.
In this study both RTK and PPP positioning techniques have been implemented and employed in order to retrieve small-scale high-rate site displacements. Methodology and algorithms applied in self-developed software allowing for precise absolute and relative multi-GNSS positioning were given and supported by the results of conducted experiment. In the experiment were used the GNSS observations derived from high-rate (50 Hz) geodetic receivers and processed using several established scenarios in a RTK and PPP modes. The dynamic displacements were simulated using constructed device responsible for generation of GNSS antenna oscillations with dedicated amplitudes and frequencies. The results indicate on applicability of both relative and absolute positioning techniques to detection of dynamic displacements of the GNSS antenna even at the level of few millimetres after suitable signals processing.