Modeling and Investigation of a Geometrically Complex UWB GPR Antenna Using FDTD

Lee, Kwan-Ho; Chen, Chi‐Chih; Teixeira, F.L.; Lee, R.

doi:10.1109/tap.2004.832501

Cited by 57 publications

(24 citation statements)

References 22 publications

(10 reference statements)

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“…The shape and frequency content of the transmitted pulses used by GSSI and MALÅ were unknown and no specialist test equipment was available to measure them. In common with many other GPR simulations (Gurel and Oguz, 2000;Lee et al, 2004;Nishioka et al, 1999;Roberts and Daniels, 1997) a Gaussian shaped pulse was assumed with a centre frequency close to the manufac-turers specification. Although a simple Gaussian shape is a good approximation, it may not be an entirely realistic representation of the real pulse shape.…”

Section: Analysis Of Geometries and Main Components Of The Real Antennasmentioning

confidence: 99%

Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method

2011

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Very few researchers have developed numerical models of Ground-Penetrating Radar (GPR) that include realistic descriptions of both the antennas and the subsurface. This is essential to be able to accurately predict responses from near-surface, near-field targets. This paper presents detailed three-dimensional (3D) Finite-Difference Time-Domain (FDTD) models of two commercial GPR antennas-a Geophysical Survey Systems, Inc. (GSSI) 1.5 GHz antenna and a MALÅ Geoscience 1.2 GHz antenna-developed using simple analyses of the geometries and the main components of the antennas. Values for unknown parameters in the antenna models (due to commercial sensitivity) were estimated by using Taguchi's optimisation method, resulting in a good match between the real and modelled crosstalk responses in free-space. Validation using a series of oil-in-water emulsions to simulate the electrical properties of real materials demonstrated that it was essential to accurately model the permittivity and dispersive conductivity. When accurate descriptions of the emulsions were combined with the antenna models the simulated responses showed very good agreement with real data. This provides confidence for use of the antenna models in more advanced studies.

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Section: Analysis Of Geometries and Main Components Of The Real Antennasmentioning

confidence: 99%

Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method

2011

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“…UWB offers a promising solution to achieve fine range resolution and communication applications and high data-rate for radar [3][4] for its huge bandwidth. Applications of the UWB technology were focused on short-range high data-rate communications since the 1990s.…”

Section: Introductionmentioning

confidence: 99%

Pulse Modulation Method to Decrease the Blind Zone in Ultra-wideband Pulse Compression Radar Systems

Zhang¹,

Ma²,

Yang³

et al. 2017

Proceedings of the 3rd Annual International Conference on Electronics, Electrical Engineering and Information Science (EEEIS 20

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Abstract.A short penetrating distance is a drawback of traditional ultra wideband radar systems. A pulse compression technique has been used in UWB radar systems to increase the penetrating distance. However, this leads to an increase in the blind zone. The paper proposes a new method to address this issue which uses combined binary phase-coded UWB signals that are pulse-modulated by a pseudo random number (PRN). We demonstrate that this method does not cause an increase in the blind zone as long as the maximum detection range of the short pulses is longer than the minimum detection blind zone of the long pulses. The simulation results show that the theoretical analysis is correct and the proposed method can greatly decrease the radar detection blind zone. Furthermore, we demonstrate the feasibility and superiority of the proposed method in improving the performance of radar detection systems.

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“…Simulations of Ground Penetrating Radar (GPR) that have included models of the actual antenna details have been mainly of antennas used in academia or for research purposes [1], [2], [3], [4], [5], [6], [7], [8], [9], [10]. There has been very limited published work of GPR simulations with models of commercial antennas [11], [12], [13].…”

Section: Introductionmentioning

confidence: 99%

An evaluation of Finite-Difference and Finite-Integration Time-Domain modelling tools for Ground Penetrating Radar antennas

Warren

Pajewski

Ventura

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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Abstract-The development of accurate and realistic models of Ground Penetrating Radar (GPR) antennas is being driven by research into quantitative amplitude information from GPR, improved GPR antenna designs, and better-performing forward simulations that can feed into inversion algorithms. The FiniteDifference Time-Domain (FDTD) method and Finite-Integration technique (FIT) are popular numerical mehtods for simulating electromagnetic wave propagation. Time-Domain methods are particularly well-suited to modelling ultra-wideband GPR antennas as a broad range of frequencies can be modelled with a single simulation. We present comparisons using experimental and simulated data from a Geophysical Survey Systems 1.5 GHz antenna and a MALÅ Geoscience 1.2 GHz antenna. The antennas were investigated in free space and over a lossy dielectric environment with a target. For the simulations we used a commercial solver -Computer Simulation Technology Microwave Studio (CST) -and a free open-source FDTD solver -gprMax. For each test scenario, phase and amplitude information from the antenna responses were compared. Generally, we found very good agreement between the experimental data and the two simulations.

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Modeling and Investigation of a Geometrically Complex UWB GPR Antenna Using FDTD

Cited by 57 publications

References 22 publications

Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method

Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method

Pulse Modulation Method to Decrease the Blind Zone in Ultra-wideband Pulse Compression Radar Systems

An evaluation of Finite-Difference and Finite-Integration Time-Domain modelling tools for Ground Penetrating Radar antennas

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