Resonance of liquid core according to the data of tidal gravity observations in Talgar

The method of contrast separation of wavelets near the resonance frequency of liquid core is proposed, based on the elimination of principle waves from the series being analyzed with the subsequent automatic minimization of the noise level and with the repeated spectral analysis of the residual curve. The minimization of noise is achieved due to (1) the sliding spectral analysis with automatic step selection and (2) the automatic optimization of the shape of the window. It is shown that for the two-year-old series of observations already after the fourth-fifth iterations this method makes it possible to obtain stable values of the gravimetric factor for the Ψ1 and Φ1 waves with an uncertainty of 40% and 20% respectively, whereas the standard methods of spectral analysis enables one to obtain the same accuracy only for an appreciably longer time series (with a duration of no less than three-four years even for considerably less noisy data, obtained with the aid of cryogenic gravimeters).