Time-delay estimation by enhanced orthogonal matching pursuit method for thin asphalt pavement with similar permittivity

Meng Sun (1) , Jingjing Pan (1) , Yide Wang (2) , Xiaofei Zhang (1) , Xiaoting Xiao (3) , Cyrille Fauchard (4) , Cédric Le Bastard (4)

1 NUAA - Nanjing University of Aeronautics and Astronautics [Nanjing]
2 IETR - Institut d'Électronique et des Technologies du numéRique
3 Southwest Petroleum University
4 ENDSUM - Evaluation non destructive des structures et des matériaux

Time-delay estimation (TDE) for thin top layers of asphalt pavement is a challenging task due to the limited resolution of ground penetrating radar (GPR) as well as small permittivity difference between top layers. Echoes backscattered from the interfaces of top layers with similar permittivity have usually much smaller amplitudes compared with other echoes, which can be called weak signals. The weak backscattered echoes are usually too sensitive to the noise and other strong echoes that current signal processing approaches (subspace-based methods and compressed sensing based methods) might have false estimation results even failures without proper processing of them. Therefore, in this paper, an enhanced orthogonal matching pursuit (OMP) method is proposed to deal with weak signals resulting from similar permittivity of adjacent asphalt layers. Based on the orthogonality between signal and noise subspaces, we firstly apply the truncated singular value decomposition (SVD) on the received signals, in order to reduce the noise impact. Secondly, we build an orthogonal matrix to the mode matrix of the pre-estimated strong backscattered echoes, and map it to the overcomplete dictionary matrix, such that the influence of the residual of the strong backscattered echoes can be reduced. Finally, the time-delays of backscattered echoes and layer thicknesses are estimated. Compared with conventional approaches, the proposed method is more suitable for TDE in thin asphalt pavement detection. The accuracy of the proposed method is validated by both numerical and experimental data.

Mots clés: thickness measurement; permittivity; orthogonal matching pursuit (OMP).; time-delay estimation (TDE); Pavement survey

Domaines: Electronique; Autre

Meng Sun, Jingjing Pan, Yide Wang, Xiaofei Zhang, Xiaoting Xiao, et al.. Time-delay estimation by enhanced orthogonal matching pursuit method for thin asphalt pavement with similar permittivity. IEEE Transactions on Intelligent Transportation Systems, 2022, 23 (7), pp.8940 - 8948. ⟨10.1109/TITS.2021.3088312⟩. ⟨hal-03234571⟩