Application of generalized S transform with lowpass filtering to layer recognition of Ground Penetrating Radar

Compared with other methods for analyzing time-varying signal, the S transform has many particular merits. But the window function of the S transform is fixed, which limits its application to signal analysis and processing. To solve this problem, this study improves and generalizes the S transform, introduces the modification parameters into the window function of the S transform and integrates the low-pass filtering function into it. And a generalized S transform is proposed. Temporal resolution and frequency resolution of the generalized S transform are regulated via adjusting the parameters. Consequently, the applicability of the generalized S transform is strongly enhanced. This work adopts the generalized S transform to conduct a layer-recognition study using ground penetrating radar data and achieves desirable results.