3D utility mapping using electronically scanned antenna array

Egil S. Eide; Jens F. Hjelmstad

doi:10.1117/12.462308

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12 April 2002 3D utility mapping using electronically scanned antenna array

Egil S. Eide, Jens F. Hjelmstad

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Proceedings Volume 4758, Ninth International Conference on Ground Penetrating Radar; (2002) https://doi.org/10.1117/12.462308
Event: Ninth International Conference on Ground Penetrating Radar (GPR2002), 2002, Santa Barbara, CA, United States

Abstract

Subsurface mapping using a single-antenna GPR is a time-consuming operation especially when large areas are to be covered. The data acquisition can be performed much more efficiently using an electronically scanned antenna array. The stepped-frequency 3D GPR that is developed at the Norwegian University of Science and Technology uses a 1 meter wide antenna array that consists of 31 transmitlreceive antenna pairs. The main application of the system is utility mapping of streets where the underground consists of a jungle of cables and pipes. The data from the 1 meter wide swath is focused into a 3D image cube using 3D wavenumber migration. By combining several parallel swaths, it is possible to generate underground maps of the whole area at different depths. The radar has successfully been used for mapping of pipes, cables and old tramlines in Trondheim during 2001. The wide bandwidth (100 MHz — 1 .6 GHz) gives high enough resolution to map shallow features such as asphalt thickness and base layer structure as well as deep structures such as ground composition and utility infrastructure . In this way, the data from a survey can serve more than one customer and be stored in databases for future retrieval. The results from the field tests demonstrate the much higher user friendliness and quality of data for true 3D imaging as compared to standard 2D GPR profiling.

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Egil S. Eide and Jens F. Hjelmstad "3D utility mapping using electronically scanned antenna array", Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); https://doi.org/10.1117/12.462308

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