Time Delay and Interface Roughness Estimation Using Modified ESPRIT With Interpolated Spatial Smoothing Technique

Abstract

International audienceIn civil engineering, ground penetrating radar is a common technique for evaluating the structure and quality of road pavement. 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. A modified estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm combined with an interpolated spatial smoothing technique is proposed. It allows us to jointly and efficiently estimate the time delay and interface roughness by ultrawideband radar (the upper frequency up to 8-10 GHz) with low computational complexity. The proposed algorithm is tested on both numerical and experimental data. Simulation and experimental results show the good performance of the proposed algorithm

A Linear Prediction and Support Vector Regression-Based Debonding Detection Method Using Step-Frequency Ground Penetrating Radar

“…In this section, the proposed method is tested with two experimental data sets from IFSTTAR carousel [18], [19]. Two media are probed with SF-GPR.…”

“…Layer 2 represents artificial debondings with a thickness about 0.5-1 cm. The measurements have been carried out at 10-, 50-, and 200-Kcycles loading stages [18]. A quasi-monostatic step frequency radar with transmitter (Tx) and receiver (Rx) antennas close to each other is used.…”

“…First, a time filtering is used to delete the air wave. Second, data whitening by the pulse is applied [18]. The radar pulse is measured from a metal plane.…”

Advanced Signal Processing Methods for Ground-Penetrating Radar: Applications to Civil Engineering

“…), many signal processing methods have been developed, particularly high-resolution techniques. Media parameters, such as layer thickness [5], [10]- [13], media permittivity [7], [12], [19], and interface roughness [14]- [16] are important in evaluating the structure and quality of civil engineering materials. These parameters allow the characterization of the probed media.…”

“…With the FIGURE 1. The French Research Institute of Science and Technology for Transport, Development, and Networks' (IFSTTAR's) air-coupled stepfrequency GPR and the automated bench to scan the near subsurface [14].…”