Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

We have investigated the variation of reflection energy in GPR with antenna orientations due to the radiation pattern and polarization of antenna. In order to analyze the dependence of the radar response on the orientation of the antennas relative to the strike and dip angle of the reflector, numerical modeling for the thin sheet model was performed. Three antenna orientations are applied in the test: One antenna orientation is perpendicular to the survey line, another is parallel to the survey line and the other is the mix of the two. For the first two cases, responses with strike have great dependence on the dip angle of the reflector. For the last case, however, the response with strike has similar pattern regardless of dip angle of reflector. We have verified our theoretical study through field experiments at a granite quarry. This paper suggests that the three types of survey should be carried out in order to get all events from reflectors with arbitrary dip and strike because there are undetected reflectors depending on strike and dip angle for specific antenna orientation.