Diurnal and sub-diurnal oscillations in GPS coordinates

摘要

This paper presents the results of the frequency and time-frequency analyses of the coordinates of permanent GPS sites obtained from short-time solutions. The aim was to estimate the usefulness of GPS observations for the short-period geodynamical studies, and check how tidal models in Bernese fit to individual sites conditions. This study shows that East-West component is noisier than North-South and the East-West oscillations have greater energy, this can be the influence of using short-time solutions. There are some oscillation in tidal frequency on few of analysed sites coordinates. These oscillations could be explained by the residual ocean tidal loading effect. More detailed description of the observed oscillations needs further studies on the method of precise coordinates determination with sub-daily sampling rate. The paper contains preliminary results of analyses on the short-time GNSS solutions conducted in the Centre of Applied Geomatics of the Warsaw Military University of Technology.