POTENTIALITIES OF ULTRAWIDEBAND GPR IN LOW-RESISTIVITY GEOENVIRONMENTS
A.A. Cheremisin1,2, Yu.V. Vasil’ev2, V.V. Olenchenko3,4, M.I. Epov3,4, R.E. Toib5, I.S. Shnipov5, S.V. Shirokov5, V.B. Boltintsev6
1Siberian Federal University, pr. Svobodnyi 79/10, Krasnoyarsk, 660041, Russia
2Krasnoyarsk Institute of Railway Transport, Irkutsk State University of Railways, ul. Lado Ketskhoveli 89, Krasnoyarsk, 660028, Russia
3A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
4Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
5GeoTekhMonitoring, ul. Baumana 3, Krasnoyarsk, 660028, Russia
6Geodizond, pr. Gagarina 14, St. Petersburg, 196211, Russia
Keywords: Сверхширокополосная георадиолокация, электротомография, Ultrawideband GPR, electrical resistivity tomography
Abstract
We assess the potentialities of ultrawideband (UWB) electromagnetic pulse sounding of low-resistivity geoenvironments using the ground-penetrating radar (GPR) system developed by us and compare the obtained results with 2D electrical resistivity tomography and standard GPR data. The research was performed in an area of Quaternary clay deposits with a resistivity of 20-50 Ohm·m. For an OKO-2 GPR antenna with a center frequency of 150 MHz, the sounding depth is 2-4 m, whereas UWB sounding provides penetration of the GPR pulse to a depth of 30-40 m. Deep UWB sounding of low-resistivity environments is possible under the following conditions: use of generators based on drift step recovery diodes (DSRDs), high matching of the UWB receiving and transmitting antennas to the environment, and an increase in the noise immunity of the recording system, in particular, due to a decrease in the intensity of air waves.
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