Application of a Combined Denoising Method in Ground Penetrating Radar Signal Pre-processing

Aiming at the difficulties of low signal-to-noise ratio (SNR) and difficulty of extracting the features in step frequency continuous wave ground penetrating radar (SFCW-GPR) echo pre-processing, a new method of echo pre-processing combined with wavelet threshold denoising algorithm and high-pass filter is proposed. The combined method realizes the extraction of useful signals with slowly changing speed by multi-resolution analysis of signals containing Gauss white noise. Compared with traditional processing methods, the wavelet threshold denoising algorithm has higher SNR and smaller mean square error (MSE) and has better processing effect and imaging effect.