6 July 2000 Accurate FDTD simulation of a GPR system
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Abstract
An accurate simulator of a GPR system is implemented by using the FDTD method. To calculate numerically the receiving responses for an actual GPR system, the simulation space contains the equivalent models of transmitting and receiving antennas, antenna feeds, dispersive ground, and buried target. Several GPR simulators were presented in literature, but all of them required additional signal processing procedures or an assumption of non-dispersive ground medium. Recently, some improved techniques of antenna modeling and the PML absorbing boundary condition for dispersive or layered media were extended by several investigators. In this paper, therefore, the conventional simulations are improved by introducing the extended techniques. An actual measurements of a GPR system with fabricated antennas is accomplished above a PVC tank filled with dry sand in our laboratory. The validity of our simulation is assured by comparing the FDTD results with the measurement data of the received voltages for a GPR in the same situation. Our simulator may be used as an effective tool in optimal design as well as performance improvement of a GPR system.
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Seung-Yeup Hyun, Sang-Wook Kim, Se-Yun Kim, "Accurate FDTD simulation of a GPR system", Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000); doi: 10.1117/12.390660; https://doi.org/10.1117/12.390660
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KEYWORDS
Antennas

General packet radio service

Finite-difference time-domain method

Data modeling

Signal processing

Transmitters

Dielectrics

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