Measurement of dielectric constant based on time-domain ground-penetrating radar curve imaging algorithm

Aiming at the problem of ground-penetrating radar measuring the accuracy and dielectric constant of underground targets, this paper combines the interface Snell's law and the co-centering method, uses the time-domain distance curve fitting to obtain the echo time, and uses the distance between the transmitter and receiver antennas as a variable to find the relative dielectric constant. The non-destructive detection of the dielectric constant is realized. The feasibility and stability of the model are verified using the GPRMAX simulation software. When the target is at 0.5 m below ground and the dielectric constant of the underground medium is in the range of 4-8, the error of the relative dielectric constant calculated by the model averages at 5.41%, and the error of the calculated target depth averages at 2.96%. This method is suitable for detecting the dielectric constant of any target and medium in the subsurface.