User libraries is a sub-package where useful Python modules contributed by users are stored.

# GPR antenna models¶

## Information¶

Author/Contact: Craig Warren (Craig.Warren@ed.ac.uk), University of Edinburgh

Attribution/cite: Warren, C., Giannopoulos, A. (2011). Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method. Geophysics, 76(2), G37-G47. (http://dx.doi.org/10.1190/1.3548506)

The module currently features models of antennas similar to commercial GPR antennas:

A description of how the models were created can be found at the reference given by the aforementioned attribution/cite.

## Module overview¶

• antennas.py is a module containing the descriptions of the antennas.

## How to use the module¶

The antenna models can be accessed from within a block of Python code in an input file. The models are inserted at location x,y,z. The coordinates are relative to the geometric centre of the antenna in the x-y plane and the bottom of the antenna skid in the z direction. The models must be used with cubic spatial resolutions of either 1mm (default) or 2mm by setting the keyword argument, e.g. resolution=0.002. The antenna models can be rotated 90 degrees counter-clockwise (CCW) in the x-y plane by setting the keyword argument rotate90=True.

### Example¶

To include an antenna model similar to a GSSI 1.5 GHz antenna at a location 0.125m, 0.094m, 0.100m (x,y,z) using a 2mm cubic spatial resolution:

#python:
from user_libs.antennas import antenna_like_GSSI_1500
antenna_like_GSSI_1500(0.125, 0.094, 0.100, resolution=0.002)
#end_python: