Table 5 Comparison of several typical time-frequency analysis methods.
From: Time frequency analysis of elastic wave PSO OMP for defects in flat steel of down conductors
Method | Time-Frequency resolution | Noise immunity | Computational complexity | Applicability |
|---|---|---|---|---|
STFT | Due to window influence, there is a resolution limitation | Generally, window selection affects noise reduction capability | Low, suitable for real-time computing | Suitable for stable or slowly changing signals |
CWT | Adaptive resolution, but limited high-frequency resolution | Good, suitable for mutation signals | Medium, dependent on mother wavelet selection | Suitable for short-term mutation signal analysis |
WVD | High, but with significant cross term interference | Poor, significant noise impact | High, with a large amount of computation | Suitable for single component signals |
SPWVD | High and with few cross terms | Good, smooth window reduces interference | Moderate, moderate computational burden | Suitable for non-stationary signals, especially Lamb waves |
