Estimation of subsurface dielectric target depth for GPR planetary exploration: Laboratory measurements and modeling

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• 作者：Sebastian Emanuel Lauro^a ; ^{lauro@fis.uniroma3.it} ; Elisabetta Mattei^b ; ^{elisabetta.mattei@unitus.it} ; Pier Matteo Barone^a ; ^{pmbarone@fis.uniroma3.it} ; Elena Pettinelli^a ; ^{pettinelli@fis.uniroma3.it} ; Giuliano Vannaroni^a ; ^{vannaroni@fis.uniroma3.it} ; Guido Valerio^c ; ^{guido.valerio@univ-rennes1.fr} ; Davide Comite^d ; ^{comite@die.uniroma1.it} ; Alessandro Galli^d ; ^{galli@die.uniroma1.it}
• 关键词：Ground penetrating radar (GPR) ; Planetary exploration ; Experimental laboratory setup ; Antenna detection at an interface ; Scattering from buried objects ; Numerical modeling
• 刊名：Journal of Applied Geophysics
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：93
• 期：Complete
• 页码：93-100
• 全文大小：1120 K

文摘

In order to test the accuracy of Ground Penetrating Radar (GPR) in the detection of subsurface targets for planetary exploration, a laboratory scale experiment is performed based on a ¡®sand box¡¯ setup using two different bistatic GPR commercial instruments. Specific attention is paid to the challenging case of buried dielectric scatterers whose location and dimensions are of the same order of magnitude of the GPR antenna separation and signal wavelengths. The target depth is evaluated by using the wave propagation velocity measured with Time Domain Reflectometry (TDR). By means of a proper modeling of the different wave-propagation contributions to the gathered signal, the position of buried targets is correctly estimated with both GPRs even for rather shallow and small-size scatterers in near-field conditions. In this frame, relevant results for a basalt block buried in a silica soil are discussed. The experimental configuration is also simulated with an ad-hoc numerical code, whose synthetic radar sections fully confirm the measured results. The acquired information is of paramount importance for the analysis of various scenarios involving GPR on-site application in future space missions.