Abstract
Due to interference from coherent reflected waves and clutter, it is difficult for ground-penetrating radar (GPR) signals to enable exact quantitative analyses of tunnel void defects. According to GPR pulse features, a new wavelet basis (named the GPR3.3 wavelet) was constructed using an improved biorthogonal wavelet construction method. In addition, based on the wavelet transform modulus maximum method, a new quantitative analysis method for GPR signals that is based on the biorthogonal wavelet basis (the QAGBW method) is proposed. The QAGBW method based on the GPR3.3 wavelet was applied in a quantitative analysis of analog and measured signals. The results show that the GPR3.3 wavelet, which can identify the singularity of a GPR pulse, is an optimal wavelet basis for quantitative analysis. Furthermore, the QAGBW method based on the GPR3.3 wavelet has greater precision than the regularized deconvolution method for the quantitative analysis of the depth and vertical size of voids because it restrains the interference of coherent reflected waves and clutter.
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