Modeling of GPR data in a stack of VTI-layers with an analytical code

We developed an analytical code to model electromagnetic fields in 3D in a stack of vertical transverse isotropic layers. This code is suitable to model low-frequency as well as high-frequency responses and it is expected to become available as an open source package in 2014. We give an overview of the code and use it to investigate the sensitivity of different Ground Penetrating Radar antenna configurations to the horizontal and vertical electric permittivity. This investigation shows that a configuration with the source and the receiver antennas horizontal and orthogonal to the survey line is the most suitable for estimating the horizontal and vertical electric permittivity if data are only available for small offsets.