Reverse time migration for ground penetrating radar using finite difference
time domain method
Yoshinori Sanada and Yuzuru Ashida
Graduate school of Engineering, Kyoto University, Japan.
E-mail: sanada@tansa.kumst.kyoto-u.ac.jp
Abstract
The finite difference time domain (FDTD) method is calculated by stepping
finite approximation scheme for two Maxwell's curl equations. Since it allows
arbitrary electrical conductivity and permittivity variations within a model,
the FDTD method has become one of the powerful forward modeling methods for
electromagnetic phenomena. The reverse time migration, which is performed by
inserting the recorded data as a boundary conditions at each recorder
position in reverse time order, is one of the imaging algorithms. In this
paper, the reverse time migration for the ground penetrating radar (GPR) data
is formulated using FDTD scheme into two cases. In lossless media case, the
method is successfully demonstrated to synthetic data for two models: steeply
dipping structure and point diffractors models. In lossy media case, the
forward scheme includes diffusion term, while the reverse time scheme has
divergence term. In such a case, when the electromagnetic wave velocity is
regarded as constant, this methodology is able to be applied successively.
raeg98@tansa.kumst.kyoto-u.ac.jp
Last modified: Fri Nov 6 13:23:42 1998