Parametric study on processing GPR signals to get a dispersion curve

The knowledge of moisture content in surface concrete structure is a major subject of interest frequently studied by ground-penetrating radar (GPR) techniques. This paper proposes a parametric study of an extraction technique of the direct wave dispersion-technique originally applied for seismological data and adapted to GPR waves. The herein procedure includes the picking of the direct wave in the material and the calculation of the dispersion curve of the phase velocity in function of frequency, using the f - β transform. Unfortunately, for GPR signals, many factors can introduce inaccuracies into the determination of the dispersion curves. In this case, we need to know the influence of different parameters used in this processing methodology.