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- W2044464908 abstract "Antenna height, orientation, shielding and subsurface properties all impact GPR responses. Although the basic concepts are generally understood, clarifying the key relationships can aid interpretation. Our long term goal is to develop easily parameterized models of transmitting and receiving components of GPR systems that will provide for quantitative interpretation of data acquired with real systems. Our first step was to develop modeling capacity and response presentation tools to help with development; the initial results have been both informative and forced a better understanding of near and far field. We are using three-dimensional (3D) finite-difference time-domain (FDTD) modeling. Model results can be presented in a variety of forms. In this paper, we focus on presenting the emitted energy characteristics and use radiation pattern display format for infinitesimal dipoles, resistively loaded dipoles and shielded dipoles. Patterns are computed for a range of environments such as free-space and over loss-less half-spaces with various properties. The energy distribution patterns are presented to investigate the behavior with distance away from the transmitter feed point, and as a function of height above the ground surface. The numerical simulations provide expected insights plus demonstrate the benefit of ground-coupling and the impact of shielding on GPR responses. Further, using the total radiated energy parameter is a novel method for displaying directivity, for GPR transient emissions." @default.
- W2044464908 created "2016-06-24" @default.
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- W2044464908 date "2013-12-01" @default.
- W2044464908 modified "2023-10-14" @default.
- W2044464908 title "Characterizing the energy distribution around GPR antennas" @default.
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- W2044464908 doi "https://doi.org/10.1016/j.jappgeo.2013.08.001" @default.
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