11:00 AM - 11:20 AM
[GP-02] Higher resolution antenna technique for efficient large-scale, 3D array GPR investigations
For the last 10-15 years, and as an alternative to time-consuming single channel GPR investigations, several 3D array GPR instruments have been available around the world. The first commercially available array instrument, the MALÅ Imaging Radar Array (MIRA), was based on the traditional repetitive sampling technique. It featured a minimum channel spacing of 8 cm, producing exceptionally high-resolution 3D data, compared to the course 3D images often produced by single channel surveys at the time. The data from these single channel surveys were most often (for practical reasons) collected with a crossline profile spacing of 25 to 50 cm (at the most) which allowed the surveyor to cover approximately 2500m2 per day (3D). The array systems, on the other hand, could cover several hectares of land per day, at a higher resolution, and this allowed for the mapping of entire landscapes.
Today GPR antennas has further been refined, and real-time sampling techniques have been introduced. These HDR (High Dynamic Range) antennas enable significantly faster data acquisition rates, a greater signal-to-noise ratio (resulting in greater depth penetration and higher resolution data) and an unprecedented dynamic range. For a long time, HDR techniques were only available for single channel GPR antennas, but as of now, the technique has been implemented in next-generation 3D array systems, such as the MIRA HDR 500. In line with the rapid development of reliable hardware solutions, cutting edge and stream-lined software packages has followed closely.
The purpose of this paper is to explain the advantages of the HDR technique as well as the positive implications this have had on the development of recent 3D array GPR systems, as exemplified by high-resolution utility data collected with the MIRA HDR system from different urban sites in Sweden.
Today GPR antennas has further been refined, and real-time sampling techniques have been introduced. These HDR (High Dynamic Range) antennas enable significantly faster data acquisition rates, a greater signal-to-noise ratio (resulting in greater depth penetration and higher resolution data) and an unprecedented dynamic range. For a long time, HDR techniques were only available for single channel GPR antennas, but as of now, the technique has been implemented in next-generation 3D array systems, such as the MIRA HDR 500. In line with the rapid development of reliable hardware solutions, cutting edge and stream-lined software packages has followed closely.
The purpose of this paper is to explain the advantages of the HDR technique as well as the positive implications this have had on the development of recent 3D array GPR systems, as exemplified by high-resolution utility data collected with the MIRA HDR system from different urban sites in Sweden.
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