Experimental and modeled performance of a ground penetrating radar antenna in lossy dielectrics

Warren, Craig and Giannopoulos, Antonios (2016) Experimental and modeled performance of a ground penetrating radar antenna in lossy dielectrics. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 9 (1). pp. 29-36. ISSN 1939-1404

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Warren, Giannopoulos - Experimental and modeled performance of a GPR antenna in lossy dielectrics.pdf - Accepted Version

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Official URL: http://ieeexplore.ieee.org/document/7117350/

Abstract

The way in which electromagnetic fields are transmitted and received by ground penetrating radar (GPR) antennas is crucial to the performance of GPR systems. Simple antennas have been characterized by analyzing their radiation patterns and directivity. However, there have been limited studies that combine real GPR antennas with realistic environments, which is essential to capture the complex interactions between the antenna and surroundings. We have investigated the radiation characteristics and sensitivity of a GPR antenna in a range of lossy dielectric environments using both physical measurements and a three-dimensional (3-D) finite-difference time-domain (FDTD) model. Experimental data were from measured responses of a target positioned at intervals on the circumference of a circle surrounding the H-plane of the antenna. A series of oil-in-water emulsions as well as tap water were used to simulate homogeneous materials with different permittivities and with complex conductivities. Numerical radiation patterns were created utilizing a detailed 3-D FDTD model of the antenna. Good correlation was shown between the experimental results and modeled data with respect to the strength of the main lobe within the critical angle window. However, there are discrepancies in the strength of main lobe at shallow angles. In all the dielectrics, the main lobes are generally broad due to the near-field observation distance but, as expected, become narrower with increasing permittivity. These results provide confidence for further use of the FDTD antenna model to investigate scenarios such as larger observation distances and heterogeneous environments that are difficult to study experimentally.

Item Type: Article
Uncontrolled Keywords: Antenna measurements, Antenna radiation patterns, Ground penetrating radar, Permittivity, Dielectrics, Dipole antennas
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
H200 Civil Engineering
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Craig Warren
Date Deposited: 13 Jul 2017 16:01
Last Modified: 22 Jul 2017 16:18
URI: http://nrl.northumbria.ac.uk/id/eprint/31292

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