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Investigating airborne low frequency GPR antenna-ground coupling through modelling

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dc.contributor.author Vogt, D
dc.contributor.author Van Schoor, Michael
dc.date.accessioned 2014-02-13T08:43:18Z
dc.date.available 2014-02-13T08:43:18Z
dc.date.issued 2013-10
dc.identifier.citation Vogt, D. and Van Schoor, M. 2013. Investigating airborne low frequency GPR antenna-ground coupling through modelling. In: South African Geophysical Association 13th Biennial Conference and Exhibition, Kruger Park, 6-9 October 2013 en_US
dc.identifier.uri http://earthdoc.eage.org/publication/publicationdetails/?publication=73057
dc.identifier.uri http://hdl.handle.net/10204/7187
dc.description South African Geophysical Association 13th Biennial Conference and Exhibition, Kruger Park, 6-9 October 2013. Abstract only attached. en_US
dc.description.abstract Ground Penetrating Radar (GPR) is often a good tool for detecting near surface structure, as it is cheap, fast and has high resolution. At lower frequencies, it is an excellent tool for detecting voids such as sinkholes, old excavations or rat-holes that pose a risk to surface infrastructure. However, in some situations, the potential risk from the voids prevents the use of GPR on the surface, and airborne application needs to be considered. While GPR has been successfully applied from the air, the applications have usually been over ice, which is a particularly radar transparent medium. In this case, information is required about sub-surface structure in a moderately conductive environment. In order to better understand the performance of GPR, a typical resistively loaded dipole antenna with a design frequency of around 50 MHz has been modelled at various heights above the ground. The modelling was conducted using a Finite-Difference Time-Domain code that incorporates a dispersive lossy medium model. The results show that coupling of energy into the ground is not adversely affected by raising the antenna. The antenna characteristics change, with slightly less energy being emitted at lower frequencies, but the coupling into the ground does not change. There is some change in the spreading pattern of signals in the earth that will result in small changes in the shape of the diffraction hyperbolas that are usually seen. The modelling supports testing of an airborne system to determine whether it is capable of producing meaningful results. en_US
dc.language.iso en en_US
dc.publisher SAGA (South African Geophysical Association) en_US
dc.relation.ispartofseries Workflow;11065
dc.subject Ground Penetrating Radar en_US
dc.subject GPR en_US
dc.subject Surface structure detection en_US
dc.subject Airborne Ground Penetrating Radar en_US
dc.subject Void detection en_US
dc.subject Finite-Difference Time-Domain en_US
dc.subject Electromagnetic modelling en_US
dc.title Investigating airborne low frequency GPR antenna-ground coupling through modelling en_US
dc.type Conference Presentation en_US
dc.identifier.apacitation Vogt, D., & Van Schoor, A. M. (2013). Investigating airborne low frequency GPR antenna-ground coupling through modelling. SAGA (South African Geophysical Association). http://hdl.handle.net/10204/7187 en_ZA
dc.identifier.chicagocitation Vogt, D, and Abraham M Van Schoor. "Investigating airborne low frequency GPR antenna-ground coupling through modelling." (2013): http://hdl.handle.net/10204/7187 en_ZA
dc.identifier.vancouvercitation Vogt D, Van Schoor AM, Investigating airborne low frequency GPR antenna-ground coupling through modelling; SAGA (South African Geophysical Association); 2013. http://hdl.handle.net/10204/7187 . en_ZA
dc.identifier.ris TY - Conference Presentation AU - Vogt, D AU - Van Schoor, Abraham M AB - Ground Penetrating Radar (GPR) is often a good tool for detecting near surface structure, as it is cheap, fast and has high resolution. At lower frequencies, it is an excellent tool for detecting voids such as sinkholes, old excavations or rat-holes that pose a risk to surface infrastructure. However, in some situations, the potential risk from the voids prevents the use of GPR on the surface, and airborne application needs to be considered. While GPR has been successfully applied from the air, the applications have usually been over ice, which is a particularly radar transparent medium. In this case, information is required about sub-surface structure in a moderately conductive environment. In order to better understand the performance of GPR, a typical resistively loaded dipole antenna with a design frequency of around 50 MHz has been modelled at various heights above the ground. The modelling was conducted using a Finite-Difference Time-Domain code that incorporates a dispersive lossy medium model. The results show that coupling of energy into the ground is not adversely affected by raising the antenna. The antenna characteristics change, with slightly less energy being emitted at lower frequencies, but the coupling into the ground does not change. There is some change in the spreading pattern of signals in the earth that will result in small changes in the shape of the diffraction hyperbolas that are usually seen. The modelling supports testing of an airborne system to determine whether it is capable of producing meaningful results. DA - 2013-10 DB - ResearchSpace DP - CSIR KW - Ground Penetrating Radar KW - GPR KW - Surface structure detection KW - Airborne Ground Penetrating Radar KW - Void detection KW - Finite-Difference Time-Domain KW - Electromagnetic modelling LK - https://researchspace.csir.co.za PY - 2013 T1 - Investigating airborne low frequency GPR antenna-ground coupling through modelling TI - Investigating airborne low frequency GPR antenna-ground coupling through modelling UR - http://hdl.handle.net/10204/7187 ER - en_ZA


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