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Empirical model of subdaily variations in the Earth rotation from GPS and its stability

N. Panafidina, S. Kurdubov, M. Rothacher

Proceedings of the Journées 2011 "Systèmes de Référence Spatio-Temporels", H. Schuh, S. Böhm, T. Nilsson and N. Capitaine (eds), Vienna University of Technology, 148-151 (2012)

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The model recommended by the IERS for these variations at diurnal and semidiurnal periods has been computed from an ocean tide model and comprises 71 terms in polar motion and Universal Time. In the present study we compute an empirical model of variations in the Earth rotation on tidal frequencies from homogeneously re-processed GPS-observations over 1994–2007 available as free daily normal equations. We discuss the reliability of the obtained amplitudes of the ERP variations and compare results from GPS and VLBI data to identify technique-specific problems and instabilities of the empirical tidal models.