GPR spectral analysis for clay content evaluation by the frequency shift method

Benedetto, Francesco and Tosti, Fabio ORCID: (2013) GPR spectral analysis for clay content evaluation by the frequency shift method. Journal of Applied Geophysics, 97. pp. 89-96. ISSN 0926-9851

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A recent approach relates the shift of the frequency peak of the Ground Penetrating Radar (GPR) spectrum with the increasing of the moisture content in the soil. Theweakness characterizing this approach is represented by the needs of high resolution signals, whereas GPR spectra are affected by low resolution. The novelty introduced by this work is twofold. First, we evidence that clay content information is present in the location where the maximum amplitude of the GPR spectra occurs. Then, we propose three super resolution methods, namely parabolic, triangular, and sinc-based interpolators, to further refine the location of the frequency peak. In fact, it is really important to be able to find this location quite precisely, to obtain accurate estimates of clay content. We show that the peak location can be found best through sinc-interpolation in the frequency domain of the measured data. Our experimental results confirm the effectiveness of the proposed approach to resolve a frequency shift in the GPR spectrum, even for a small amount of clay.

Item Type: Article
Identifier: 10.1016/j.jappgeo.2013.03.012
Keywords: Ground penetrating radar; Super-resolution techniques; Numerical interpolators; Frequency analysis; Pavement monitoring
Subjects: Construction and engineering > Built environment
Construction and engineering > Civil and structural engineering
Construction and engineering
Depositing User: Fabio Tosti
Date Deposited: 25 May 2016 21:55
Last Modified: 06 Feb 2024 15:44

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