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The capabilities of subsurface microwave holography are limited by mutually contradicting factors, such as penetration depth, surface reflection, and spatial resolution. As a result of the trade-off, the wavelength at the operating frequency is comparable to the typical target sizes and is not small compared with the antenna array dimensions and probing range. In order to comprehend microwave image...
The paper describes the application of the rotated staggered grid(RSG) finite-difference technique to the ground penetrating radar(GPR) simulation and migration imaging in the medium possess strong heterogeneities or inhomogeneous discontinuities. The RSG use the rotated staggered finite-difference operators, to lead a distribution of GPR field components and other physical parameters in an elementary...
Ground penetrating radar (GPR) technology is one of the main techniques of the underground pipeline detection. We can analyze the information of the underground pipeline effectively and accurately by the ground penetrating radar data. There used to be three kinds of methods to predict pipeline position and diameter by hyperbola: using the method of least square curve fitting, using Hough transform...
We developed an analytical code to model electromagnetic fields in 3D in a stack of vertical transverse isotropic layers. This code is suitable to model low-frequency as well as high-frequency responses and it is expected to become available as an open source package in 2014. We give an overview of the code and use it to investigate the sensitivity of different Ground Penetrating Radar antenna configurations...
Ground-penetrating radar (GPR) is a wide ranging non-destructive tool used in many fields of application including effective pavement engineering surveys. Despite the high potential and the consolidated results obtained over the past decades, pavement distress manuals based on visual inspections are still widely used, so that only the effects and not the causes of faults are generally considered....
The solution of the GPR inverse problem is considered in application to the context of linearly continuous quasi-homogeneous layers. A new implementation of the solution of Fredholm equation is proposed, allowing to extend the scope of the GPR method for evaluating the complex dielectric permittivity of a medium.
This paper presents the rigorous efficient PILE (Propagation Inside-Layer-Expansion) numerical method to calculate the frequency and time responses of the field scattered by two random rough surfaces separating three homogeneous media. Here, the study is applied to ground penetrating radar (GPR) (nadir angle, Ricker pulse, near or/and far field) for nondestructive pavement survey by taking the roughness...
We present a three-dimensional scheme that can be used to compute a vertical radar profile from reflection data measured at the surface. This is done by first constructing a focusing wavefield, which focuses at the chosen location in the subsurface that is then the virtual receiver location for the vertical radar profile Green's function. Because the up- and downgoing parts of the Green's function...
We presented a new ray tracing technique which is applicable for crosshole radar traveltime tomography. The new algorithm divides the ray tracing process into two steps: First the wavefront propagation times of all grid points in a velocity field are calculated using the multistencils fast marching method (MSFM), and then the ray tracing paths having the minimum traveltime can be easily obtained by...
Antenna arrays have been increasingly used in many civil engineering and geoscience applications as they allow collecting multi-offset measurements simultaneously, thereby providing additional information for subsurface imaging and characterization. We extended a new near-field intrinsic antenna modeling approach to antenna arrays. The array was considered as a combination of couples of transmitting-receiving...
GPR has been used worldwide to help the police enforcement to search for missing bodies. In this paper, microwave tomography is considered as an advanced data processing technique in order to enhance the visualization and thus improve the interpretation of GPR images for forensic purposes. In particular, we discuss on an experiment that was carried out by using a pig to simulate a human body buried...
Borehole radar has great advantages in practical applications because of its deep detection range and relatively superior resolution, which has been applied to broader areas and has experienced rapid development in recent years. We have developed a prototype of directional borehole radar (DBR) with two receiving antennas along the axis and the maximum radiation direction difference of 180°, which...
There are many outcropping masses on Kıratlı travertine fields where a new or open quarry is planned to be exploited. In this study, Ground Penetrating Radar (GPR) and Vertical Electrical Sounding (VES) have been applied on these fields in order to identify massive or weathered blocks and fracture-cracked systems in a short time and at low cost. GPR data were acquired on two areas, named Ocakustu...
This study focuses on the use of ground penetrating radar (GPR) to delineate riprap layers in cross sections of tidal flat embankments. Foundation treatments are an important consideration in the reclamation of tidal flats and for offshore engineering in coastal areas with soft soils. Such treatments generally consist of explosive riprap fill. The bottom depth and cross-sectional shape of the riprap,...
LUSI (Lumpur Sidoarjo) mud volcano has been erupting solid and liquid materials for more than 7 years since its birth. The sudden nature of this phenomenon and land subsidence observed around the big hole requires immediate and precise management. Embankment built around it needs proper monitoring to observe the subsurface condition in order to avoid sudden failures. GPR monitoring, being non-destructive...
Forest soil organic horizons constitute a major component of forest ecosystems and their accurate characterization is of prime importance for ecological studies as well as for carbon cycle and global change related studies. In other respects, the presence of forest litter is known to influence remote sensing radar data over forested areas and precise determination of litter radiative properties is...
In this paper, we developed a vegetation cover model for full-wave inversion of ground-penetrating radar (GPR) data assuming multiple layers with effective electrical properties. Measurements were performed in the laboratory conditions over spelt wheat grown in a sandy soil, using a stepped-frequency continuous-wave GPR system. In order to control the sand surface water content, a water table was...
Island of Golyazi and peninsula is located in the Lake of Uluabat, in Bursa, Turkey. There was severe construction work when Miletos colonies lived 2. BC and Pergamon Kingdom 3. BC. Golyazi become archaeological conservation area at 1998. There are 87 civil architectural buildings at under protection. Hagios Konstantinos Church, Apolyon Ramparts, cemetery, mosque and bath under protection, too, on...
The charterhouse of Bourgfontaine was a major foundation, with approximately 24 brothers living in separate cells. An early modern bird's-eye view of the monastery gives us a sense of its scale, but no details. Two GPR surveys (225 and 250 MHz) were carried out: the first, in the area of the chapel behind the church, the second, in a rectangular zone of 30 m × 50 m in the great cloister. All the data...
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