Ground Penetrating Radar Antenna System Analysis for Prediction of Earth Material Properties

2005 ◽  
Author(s):  
C.P. Oden ◽  
D.L. Wright ◽  
M.H. Powers ◽  
G.R. Olhoeft
Keyword(s):  
Ground Penetrating Radar ◽  
Material Properties ◽  
System Analysis ◽  
Antenna System ◽  
Earth Material ◽  
Ground Penetrating ◽  
Radar Antenna

Effects of fractal fluctuations in topographic relief, permittivity and conductivity on ground‐penetrating radar antenna radiation

Geophysics ◽  
2003 ◽  
Vol 68 (6) ◽  
pp. 1934-1944 ◽  
Author(s):  
Bernhard Lampe ◽  
Klaus Holliger
Keyword(s):  
Ground Penetrating Radar ◽  
Fdtd Method ◽  
Antenna System ◽  
Propagation Path ◽  
Small Scale ◽  
Antenna Radiation ◽  
Topographic Roughness ◽  
Antenna Coupling ◽  
Ground Penetrating ◽  
Radar Antenna

Typical ground‐penetrating radar (GPR) transmitters and receivers are dipole antennas. These antennas have pronounced directivity properties and exhibit strong coupling to interfaces across which there are changes in electric material properties. Antenna coupling to the surface of idealized half‐space models has been the subject of intense research for several decades. In contrast, the behavior of antennas in the vicinity of interfaces with realistic topographic fluctuations and/or subsurface heterogeneities has been largely unexplored. To explore this issue, we simulate the responses of a typical surface GPR antenna system located on a suite of realistic fractal earth models using the finite‐difference time‐domain (FDTD) method. The models are characterized by topographic roughness of the air–soil interface and small‐scale heterogeneous distributions of permittivity and conductivity in the subsurface. Synthetic radiation patterns and input impedance values of the simulated GPR antenna system demonstrate that topographic roughness significantly affects the coupling of the antenna to the ground, whereas heterogeneities in the subsurface predominantly influence the antenna radiation through scattering and absorption along the propagation path.

scholarly journals Simplified Analytical Approach for an Airborne Bent Wire Ground Penetrating RADAR Antenna System

2021 ◽  
Vol 30 (1) ◽  
pp. 215-226
Author(s):  
J. Suganya ◽  
J. A. Baskaradas ◽  
U. Sciacca ◽  
A. Zirizzotti
Keyword(s):  
Ground Penetrating Radar ◽  
Analytical Approach ◽  
Antenna System ◽  
Ground Penetrating ◽  
Radar Antenna

scholarly journals Identifying Spatial and Temporal Variations in Concrete Bridges with Ground Penetrating Radar Attributes

2021 ◽  
Vol 13 (9) ◽  
pp. 1846
Author(s):  
Vivek Kumar ◽  
Isabel M. Morris ◽  
Santiago A. Lopez ◽  
Branko Glisic
Keyword(s):  
Compressive Strength ◽  
Ground Penetrating Radar ◽  
Material Properties ◽  
Temporal Variations ◽  
Concrete Bridges ◽  
Spatial And Temporal Variation ◽  
Reflected Waves ◽  
Ground Penetrating ◽  
Over Time

Estimating variations in material properties over space and time is essential for the purposes of structural health monitoring (SHM), mandated inspection, and insurance of civil infrastructure. Properties such as compressive strength evolve over time and are reflective of the overall condition of the aging infrastructure. Concrete structures pose an additional challenge due to the inherent spatial variability of material properties over large length scales. In recent years, nondestructive approaches such as rebound hammer and ultrasonic velocity have been used to determine the in situ material properties of concrete with a focus on the compressive strength. However, these methods require personnel expertise, careful data collection, and high investment. This paper presents a novel approach using ground penetrating radar (GPR) to estimate the variability of in situ material properties over time and space for assessment of concrete bridges. The results show that attributes (or features) of the GPR data such as raw average amplitudes can be used to identify differences in compressive strength across the deck of a concrete bridge. Attributes such as instantaneous amplitudes and intensity of reflected waves are useful in predicting the material properties such as compressive strength, porosity, and density. For compressive strength, one alternative approach of the Maturity Index (MI) was used to estimate the present values and compare with GPR estimated values. The results show that GPR attributes could be successfully used for identifying spatial and temporal variation of concrete properties. Finally, discussions are presented regarding their suitability and limitations for field applications.

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