Application of the Hilbert-Huang Transform for the Analysis of Impact-Echo Data

摘要

In contrast to the FFT, which only gives the frequency content of the whole signal without revealing its relation to time, the application of the Hilbert-Huang Transform (HHT) gives a time-frequency representation of the data. Examples of on-site measurements are shown, where HHT succeeds in identifying short transient signals, which could not be identified using FFT. Furthermore its application for filtering the signal and its capability to analyze data from nonlinear systems are demonstrated.