Half-space estimation by time gating based strategy

In this work we deal with an estimation procedure of the Fresnel reflection coefficients for an half-space starting from GPR measurements collected under a reflection mode single view/multistatic configuration. After, the estimation of the Fresnel coefficient, the related electromagnetic parameters of the soil can be evaluated via simple algebraic relations. The problem is faced by exploiting the plane waves spectrum representation. Unfortunately when an antenna is close to the air/soil interface, interactions arise so that the actual antenna plane-wave spectrum is dependent on the searched for soil properties and consequently not known. To overcome such drawbacks, a preliminary step is introduced in the overall estimation procedure, which allows us to erase the antenna/soil interface interactions thanks to a time gating method. Numerical simulations with synthetic data are presented with the aim of assessing the effectiveness of the procedure.