Abstract:
This dissertation presents mapping the physical and dielectric properties of the layered soil by using a ground-penetrating radar (GPR). The experimentations with the conventional laboratory method and the GPR were conducted in Nakhon Ratchasima province of Thailand, where it is a potential area of hardpan occurrence. In the experimentations, soil samples were collected and then measured to obtain their physical and dielectric properties. The GPR was employed to survey at the same area in order to collect the GPR signals received from the direct wave and underground. The received signals were feed to computer to perform pre-processing such as filtering and antenna calibration. A short-time matrix pencil method was employed to extract poles from the resulting signals. The extracted poles obtained from the GPR system was manipulated along with the measured physical and dielectric properties. The experimental results have shown that there exists a relationship between soil properties and extracted poles. Using the curve fitting method, the mathematical model is obtained for mapping the physical and dielectric properties of the layered soil based on the 2nd order polynomial technique. The regression value (R2) show an agreement of higher than 0.85, the percentage errors of the layered soil with unknown properties was less than 7%. This reveals that the physical and dielectric properties can be identified by using extracted poles.