Radar Enhanced Contrast Source Inversion Method for Microwave Nondestructive Evaluation

While radar imaging is one of the most promising approaches for microwave nondestructive evaluation of aging roads or tunnels, it could not retrieve a dielectric profile of a buried object, leading to difficulty in target identification. In this paper, we introduce a hybrid method by integrating the range points migration (RPM) radar imaging and the contrast source inversion (CSI) based inverse scattering to provide not only a location or shape of target, but also complex permittivity of it. The numerical and experimental data, assuming a real concrete road model, demonstrate the effectiveness of the proposed method.