Interpolation of Axial Earth Rotation Intra-Day Variations and Their Forecast
An adequate to the results of astrometric measurements by the International Earth Movement Service (IEMS) mathematical model of the intra-day tidal rotation irregularity of the deformed Earth, based on the so-called celestial mechanical method, that considers the Moon-Sun gravity-tidal perturbance, is presented therein under. Examined are intraday and nearday axial Earth rotation variations, using the third Euler-Liouville equation and considering intraday measurement data. Demonstrated are results of the model's identification parameters by the method of smallest squares, and also the analysis of intraday axial Earth rotation peculiarities. Discovered combinational frequencies, supported by IEMS surveillance can be found too. Acquired results may be useful for theoretical scientific research and to solve a number of tasks in astrometry, geophysics, and navigation.