A New Approach of Earth Tides Time-Frequency Analysis

On the basis of analyzing the feature and limits of the conventional time-frequency analysis methods,we use Huang-Hilbert Transformation(HHT) to analyze solid tide data,i.e.,use empirical mode decomposition to decompose complicated signal into the sum of finite intrinsic mode functions,and construct a 3D energy-frequency-time Hibert spectra of the data.The emulational signals and the gravity tide signal are analyzed using the HHT method,which turns out that the method is suited for the analysis of AM-FM signal.