Hourly Earth Rotation Parameter Series from GPS and Galileo Observations, and Estimations of Tidal Effects

Abstract

We use the GINS/DYNAMO software to produce hourly time series of Earth Rotation Parameters (ERP) from 2017 to 2022. Data from the American constellation GPS and the European constellation Galileo are used. Single solutions and combined solutions are produced and analyzed. The best spectral coherence between constellations lies in the retrograde semi-diurnal band. We also perform least-squares adjustments for main tidal frequencies and compare with those of previous works. A sliding window analysis reveals time variation of amplitudes of several main tides when adjusting on a selected set of frequencies.