Layered Media Parameter Estimation Based on Hyperbolic Fitting in GPR B-scan

Layered media parameter estimation is widely used in ground penetrating radar (GPR) for layered scenarios. However, the current estimating methods face many challenges, including the limited applicability in scenarios without targets for A-scan-based and CMP-based methods, and the large estimation error in layered media with targets for B-scan-based method. In order to obtain accurate parameters for layered media in the presence of targets, a method for estimating layered media parameters based on hyperbolic fitting in GPR B-scan is proposed. The method utilizes geometric relationships and refractive point approximation formulas to efficiently determine the refractive point of media and can achieve an accurate estimation of the thickness and permittivity by nonlinear least-squares optimization method for hyperbolic constraint equations. The accuracy and effectiveness of the proposed method are verified through simulation and real experiments in layered structures.