Comparing detection and location performance of perpendicular and parallel broadside GPR antenna orientations

Autor(es)

Porsani, Jorge Luis ^[1] ; Slob, Evert ^[2] ; Lima, Robson S. ^[3] ; Leite, David Nakamura ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Dept Geofis, BR-05508090 Sao Paulo - Brazil

^[2] Delft Univ Technol, Dept Appl Earth Sci, Sect Appl Geophys, Delft - Netherlands

^[3] Geophys IAG USP, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF APPLIED GEOPHYSICS; v. 70, n. 1, p. 1-8, JAN 2010.
• Citações Web of Science: 18

Resumo

GPR (Ground Penetrating Radar) results are shown for perpendicular broadside and parallel broadside antenna orientations. Performance in detection and localization of concrete tubes and steel tanks is compared as a function of acquisition configuration. The comparison is done using 100 MHz and 200 MHz center frequency antennas. All tubes and tanks are buried at the geophysical test site of IAG/USP in Sao Paulo city, Brazil. The results show that the long steel pipe with a 38-mm diameter was well detected with the perpendicular broadside configuration. The concrete tubes were better detected with the parallel broadside configuration, clearly showing hyperbolic diffraction events from all targets up to 2-m depth. Steel tanks were detected with the two configurations. However, the parallel broadside configuration was generated to a much lesser extent an apparent hyperbolic reflection corresponding to constructive interference of diffraction hyperbolas of adjacent targets placed at the same depth. Vertical concrete tubes and steel tanks were better contained with parallel broadside antennas, where the apexes of the diffraction hyperbolas better corresponded to the horizontal location of the buried target disposition. The two configurations provide details about buried targets emphasizing how GPR multi-component configurations have the potential to improve the subsurface image quality as well as to discriminate different buried targets. It is judged that they hold some applicability in geotechnical and geoscientific studies. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/17536-5 - Comparação do desempenho GPR na detecção e localização por meio da orientação de antenas paralelas e perpendiculares
• Beneficiário: Jorge Luís Porsani
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
• Processo FAPESP: 02/07509-1 - Caracterização geofísica de alvos rasos com aplicações no planejamento urbano, meio ambiente e arqueologia: estudo sobre o sítio controlado do IAG/USP
• Beneficiário: Jorge Luís Porsani
• Modalidade de apoio: Auxílio à Pesquisa - Regular