Time Delay and Interface Roughness Estimation of Pavements by Modified Music with OPM: Experimental Results

In civil engineering, roadway structure evaluation is an important application which can be carried out by ground penetrating radar. This paper focuses on the estimation of the time delay and interface roughness of civil engineering structure, like pavements. The influence of interface roughness is taken into account in the signal model. Therefore, we propose a new method which allows to efficiently estimate the time delay and interface roughness. Like in [1], the modified MUSIC is used for time delay estimation. In interface roughness estimation, we propose a modified orthogonal propagator method (OPM) to estimate the interface roughness with estimated time delay. While in [1], maximum likelihood method is applied, which needs multiple dimensional search. The proposed method is tested on the experimental data. The experimental results show the performance of the proposed method.