2D frequency-domain full-waveform inversion of GPR data: Permittivity and conductivity imaging - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2015

2D frequency-domain full-waveform inversion of GPR data: Permittivity and conductivity imaging

Résumé

Full waveform inversion of Ground Penetrating Radar data is a promising and challenging technique. As both dielectric permittivity and electrical conductivity should be recovered, the associated inverse problem is intrinsically multi-parameter. It requires to properly account for the influence of the Hessian matrix to mitigate the trade-offs between constitutive parameters. Recently, a first step in this direction was performed with the l-BFGS quasi-Newton method, which is based on an approximation of the inverse Hessian computed from previous gradient estimations. We propose to go further in solving locally the Newton equation related to the optimization workflow. For this purpose, we implement the truncated Newton method where the computation of the gradient and Hessian-vector products are respectively based on first-order and second-order adjoint state methods. On a synthetic case study, using the TE mode with borehole and surface acquisitions, we compare our results with those obtained using the l-BFGS method and we show an improvement in the precision of reconstructed parameters. A better decoupling between the two parameters is obtained with the truncated Newton method.
Fichier non déposé

Dates et versions

hal-02009489 , version 1 (06-02-2019)

Identifiants

Citer

Hugo Pinard, Stéphane Garambois, Ludovic Métivier, Michel Dietrich, Jean Virieux. 2D frequency-domain full-waveform inversion of GPR data: Permittivity and conductivity imaging. 2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR), Jul 2015, Florence, Italy. pp.1-4, ⟨10.1109/IWAGPR.2015.7292611⟩. ⟨hal-02009489⟩
121 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More