From the magazine

Array GPR systems for network level utility mapping

Array GPR systems can map areas quickly and allow 3D visualisation of the subsurface. Antenna arrays allow utility signatures (hyperbolas) to be traced across each antenna with signatures lining up across the array to show pipe orientation. Arrays, therefore, make it easier to determine the difference between, say, a buried rock, which could also produce a single hyperbola signature, and an actual buried utility.

GPR arrays also enable faster data collection, with fewer array scans needed in place of multiple single antenna passes. For example, a four antenna array can collect data four times as fast as a single antenna system. A further benefit of array systems is improved accuracy when surveying areas using orthogonal grids, with advanced signal processing techniques used to improve data quality by allowing image-processing filters, such as line finding algorithms, to be used to enhance pipe-like features.

The IDS RIS Hi-Mod system is an array radar system tailored to map both deep and shallow buried assets by using an innovative dual frequency antenna array and advanced data analysis software. The RIS Hi-Mod array is GPS and total station compatible, can be configured with one, two, three or four antennas, and is available in either 200-600 MHz or 400-900MHz configurations. By using the full configuration of four antennas, a width of 2 m is covered in a single pass.

The IDS STREAM (Subsurface Tomographic Radar Equipment for Assets Mapping) EM GPR system is a massive array developed to dramatically increase productivity when collecting underground utility data. This is done by allowing all utilities to be identified in one pass, due to its dual polarised, dual frequency (200 MHz and 600 MHz) array. The horizontally polarised antennae detect connection pipes that transverse to the main line and the direction of their travel, while the vertical polarised antennae detect main line pipes parallel to the direction of travel. The array is GPS and total station compatible, with data collected at speeds of up to 18 km per hour, so that road closures are not required. IDS customers integrate this system with mobile LiDAR technology for a complete above and below ground asset mapping solution.

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