incorporation of Variable Background Velocity in Subsurface Imaging With GPR
Beiyuan Liang and Lanbo Liu
Event name: 18th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Geophysical Modeling Studies
Publication date: 03 April 2005
Info: Extended abstract, PDF ( 222.49Kb )
For fast imaging subsurface targets with ground penetrating radar (GPR) it is common to assume a homogeneous background of electromagnetic (EM) wave velocity. Nevertheless, if some information about EM velocity is available, it is desirable to use more realistic velocity distribution in subsurface target imaging. This paper introduces a ray tracing function into GPR imaging process with using reflection energy stacking. We demonstrate the effectiveness of this approach by comparing the imaging results with different velocity layers for a typical subsurface imaging example. Use of the ray tracing technique in the imaging process built in GPR software, GIT-Radar, is better to image and determine the depths and shapes of the targets. Also, the application of the ray tracing in a 3D imaging process does not substantially retard the speed of calculation if a layered velocity model is used.