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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.

Resume La selle de Vaucresson est une orthese active qui se situe entre le siege moule et la coquille de verticalisation. Elle a connu au cours de ces dernieres annees une evolution lui permettant d’etre aussi prescrite a des enfants dont la fonction motrice globale est de niveaux 3 et 4 selon le systeme de classification de Palisano (Global Motor Function Classification System : GMFCS). Son objectif est a la fois postural et orthopedique. Le cahier des charges de la selle sera etabli apres une evaluation precise des troubles neuromoteurs et orthopediques de l’enfant. Les nouveaux rappels proprioceptifs participeront a l’organisation du referentiel axial de l’enfant. Ces afferences proprioceptives devront etre mises en place precocement pour obtenir de meilleurs resultats.

MCD2016, 8th International conference on Mechanisms of Cracking and Debonding in Pavements, NANTES, FRANCE, 07-/06/2016 - 09/06/2016; The paper gives an overview of the ongoing experiment to survey debonding areas within pavement structure during accelerated pavement testing on the Ifsttar's fatigue carrousel. Several defects have been embedded during the construction phase and have been probed by different NDT techniques. Among them, the paper focuses on radar NDT&E techniques which have been used to detect and locate the artificial defects at the early stage of the experiment and then to perform the survey at different loading cycles. Besides, the test-site has been used to test different GPR materials, including the 3D GPR technology. The experiment has also motivated some related studies in the field of GPR data modelling and data processing, which are summarized in the paper. The experiment is expected to be pursued beyond 300 loading kcycles to reach larger pavement degradations.