## Filter Results

Displaying Results 1 - 25 of 100
• ### [Front cover]

Publication Year: 2015, Page(s): 1
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Publication Year: 2015, Page(s): 1
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• ### Foreword of the 8thInternational Workshop on Advanced Ground Penetrating Radar Paper

Publication Year: 2015, Page(s): 1
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It has been our great pleasure and honor to chair the 8thInternational Workshop on Advanced Ground Penetrating Radar — IWAGPR 2015, hold in Florence, Italy, from the 7th to 10th of July, 2015. View full abstract»

• ### 2D frequency-domain full-waveform inversion of GPR data: Permittivity and conductivity imaging

Publication Year: 2015, Page(s):1 - 4
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Full waveform inversion of Ground Penetrating Radar data is a promising and challenging technique. As both dielectric permittivity and electrical conductivity should be recovered, the associated inverse problem is intrinsically multi-parameter. It requires to properly account for the influence of the Hessian matrix to mitigate the trade-offs between constitutive parameters. Recently, a first step ... View full abstract»

• ### 2D GPR monitoring without a source by interferometry in a 3D world

Publication Year: 2015, Page(s):1 - 4
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Creating virtual sources at locations where physical receivers have measured a response is known as seismic interferometry. The method does not use any information about the actual source's location. The source can be mobile phone radiation, already available in the air, as long as this background radiation can be represented by uncorrelated noise sources. Interferometry by multi-dimensional decon... View full abstract»

• ### A combined GPR and SNMR monitoring of a drained intraglacial water pocket located into the polythermal glacier of Tête Rousse

Publication Year: 2015, Page(s):1 - 4
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Formation of intraglacial lakes in polythermal glaciers results from specific climatic, topographic and aspect conditions. Their occurrence constitutes a significant threat to the valleys located below in case of sudden discharge occurring without any warning prior signs. Such case occurred in 1892 at Saint-Gervais (French Alps), where a deadly water wave reached the town a few tens of minutes aft... View full abstract»

• ### A low cost approach to acoustic filters acting as GPR cooperative targets for passive sensing

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (2)
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Ground Penetrating RADAR (GPR) is a classical sub-surface analysis tool widely used in civil engineering and environmental investigations. Currently limited to monitoring passive buried dielectric and conductivity interfaces, the instrument is perfectly suited to probe cooperative targets made of piezoelectric substrates designed to convert the incoming electromagnetic wave to an acoustic wave. Th... View full abstract»

• ### A microwave scanner for sub-surface diagnostics of artefacts

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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A microwave scanner operating in the frequency band 1-10 GHz is described. The system is based on an evanescent-field resonant sensor, allowing to obtain maps of dielectric contrast through a measurement of resonance frequency (F maps) and quality factor (Q maps). Laboratory experiments are presented with results validating the measurement system. View full abstract»

• ### A preliminary analysis of a sparse reconstruction based classification method applied to GPR data

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (3)
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This work investigates the performance of a sparse decomposition based approach applied to measured Ground Penetrating Radar (GPR) datasets for landmine recognition. The decomposition of the datasets is achieved via the solution of a constraint-relaxed convex optimization problem known as Basis Pursuit Denoise (BPDN). We demonstrate that it is crucial to appropriately construct a database of known... View full abstract»

• ### A quadratic inverse model for RF tomography

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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The linear model provided by the Born approximation is frequently exploited in inverse scattering problems. Anyway, the limits of validity of the Born model can be extended by a quadratic approximation of the non-linear operator relating the scattered field data to the unknown object function. The aim of this contribution is to present a quadratic approach and describe its experimental validation ... View full abstract»

• ### A secondary reflection pattern synthesis for GPR B-scope images

Publication Year: 2015, Page(s):1 - 4
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UWB pulse ground-penetrating-radars (GPR) have been used for surveying underground-buried objects. In cases that multiple objects are buried at nearby sites in different depths, multipath reflections, especially, the secondary reflection waves originating from the upper objects sometimes prevent us recognizing the lower occluded objects from B-scope images. The secondary reflection wave patterns a... View full abstract»

• ### A test of holographic radar for detection of hidden vertebrate tracks and trackways

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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Previous testing has indicated that holographic radar can image surficial and shallowly-buried dinosaur tracks if the track surface presents a dielectric contrast. This paper reports on blind scanning of stratigraphic surfaces just above known, exposed trackways. Testing at Valley Quarries Fairfield operation near Gettysburg, PA yielded mixed results that could not be ground-truthed. Additional te... View full abstract»

• ### Accurate analysis of GPR first-arrival signals for the evaluation of soil permittivity parameters

Publication Year: 2015, Page(s):1 - 3
Cited by:  Papers (1)
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This work is aimed at investigating the relationships between amplitude attributes of the first-arrival direct wave' (also called early-time signal', ETS, in brief), which propagates at the interface in bistatic ground penetrating radar (GPR) configurations, and the relevant shallow-soil permittivity parameters (dielectric constant and conductivity). Our analysis is developed by considering the ... View full abstract»

• ### An advanced GPR modelling framework: The next generation of gprMax

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (18)
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gprMax is a freely-available set of electromagnetic wave simulation tools based on the Finite-Difference Time-Domain (FDTD) numerical method. gprMax was originally written in the mid-1990s and has primarily been used to simulate Ground Penetrating Radar (GPR). Current computing resources offer the opportunity to build detailed and complex FDTD models of GPR to an extent that was not previously pos... View full abstract»

• ### An advanced numerical imaging procedure for GPR shallow surveys

Publication Year: 2015, Page(s):1 - 4
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The advances achievable in terms of reconstruction capabilities offered by an ad-hoc imaging procedure capable of accounting for the actual radiation features of a Ground Penetrating Radar (GPR) have been analyzed in this paper. The study is carried out by using a full-wave simulator, capable to reproduce the characteristics of the antenna system as well as the signals used for the actual illumina... View full abstract»

• ### An extension module to embed commercially sensitive antenna models in gprMax

Publication Year: 2015, Page(s):1 - 3
Cited by:  Papers (1)
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Models of antennas have been included in numerical simulations of ground penetrating radar (GPR) intermittently over the past 20 years with varying degrees of realism. Those antenna models that have been published have been mainly of antennas used in academia or for research purposes, and not regularly used commercial antennas. This is, of course, understandable as GPR manufacturers have a great d... View full abstract»

• ### An ultra high resolution stepped frequency GPR for civil engineering applications

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (3)
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In this paper the authors present an ultra high resolution and high dynamic range stepped frequency continuous wave radar for masonry investigations. The radar architecture is based on a couple of VCO in a PLL loop and a low noise receiver. This approach is able to cover with 801 steps the 4-8 GHz frequency range obtaining a theoretical range resolution of 37.5 mm in air and a dynamic range higher... View full abstract»

• ### Analysis of a 2D microwave tomography algorithm applied to a differential configuration in GPR prospecting

Publication Year: 2015, Page(s):1 - 4
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This contribution aims at assessing the imaging capabilities of a differential configuration for GPR prospecting. In particular, two receiving antennas are piled on each other at the same abscissa, and the transmitting antenna is at a fixed horizontal offset and at the intermediate height between the two receivers. The analysis is carried out with the aid of a microwave tomographic algorithm based... View full abstract»

• ### Analysis of hollow area beneath concrete slab of seawall by means of ground penetration radar

Publication Year: 2015, Page(s):1 - 4
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Seawall is an important public facility which can protect areas of human habitation from the destructive aspects of tides or waves. Maintenance and monitoring of seawall structures plays an essential role in public safety and prevention of flooding of areas behind the seawall. The presence of hollow area beneath the concrete slab of riverside slope can result in the settlement and distortion of fa... View full abstract»

• ### Analysis of time-lapse GPR data to visualize preferential flow paths

Publication Year: 2015, Page(s):1 - 3
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Time-lapse GPR data are commonly interpreted by analyzing picked travel-time differences between individual reflectors or sample-to-sample differences of the data. In this study, we employ a novel, structural similarity attribute for the interpretation of time-lapse GPR data, to image preferential flow paths. We test this attribute using synthetic GPR data calculated on a heterogeneous subsurface ... View full abstract»

• ### Anisotropy effect on GPR signals

Publication Year: 2015, Page(s):1 - 5
Cited by:  Papers (2)
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Anisotropy can affect ground penetrating radar (GPR) signals by potentially masking detection and modifying interpretation of subsurface features of interest. The effect of anisotropy may not be present in most GPR surveys but where anisotropy is present, distinctive differences exist in multi-offset GPR data. In this paper, we employ three-dimensional (3D) finite-difference time-domain (FDTD) num... View full abstract»

• ### Antennas for pavement void detection by scattering

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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Voids and cracks in asphalt or concrete can indicate the condition of a road or pavement. A decaying road may contain many very small cracks, and such small artifacts can be difficult to identify using conventional ground penetrating radar (GPR) techniques. A new approach is examined here to detect the scattering from the multitude of small defects in the ground. Consideration is given to the layo... View full abstract»

• ### Application of geophysical methods to determine subsurface acid saturated zones of heap No. 3 at Sarcheshmeh copper mine, Iran

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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Sarcheshmeh copper mine, located in Kerman Province, is the first mine in Iran utilizing heap leaching technology to extract low grade ores. In order to assure proper performance of a heap leaching pad, monitoring of the PLS within the heap is essential. In this study, application of geophysical techniques to solve heap leaching problems was investigated for the first time in Iran. Geophysical mea... View full abstract»

• ### Applications of conventional and non-conventional GPR systems in the Viking remains of Torget

Publication Year: 2015, Page(s):1 - 4
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The results of a geophysical survey conducted in the main square of Trondheim (Norway) are presented. Trondheim is one of the oldest major cities with urban settlement dating back to the Viking ages, and below the current square archaeological test excavations have revealed preserved cultural layers; the oldest from the 10thcentury. We carried out a geophysical survey in the South Easte... View full abstract»

• ### Array GPR system “Yakumo” for natural disaster mitigation

Publication Year: 2015, Page(s):1 - 4
Cited by:  Papers (1)
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Northeast Japan was attacked by the great earthquake and Tsunami on the 11thMarch 2011. We have developed an array GPR system “Yakumo” in order to use it for the recovery from the damages by Tsunami. “Yakumo” is equipped with 8-channel transmitter and receiver, and has 2m width. It can acquire GPR data rapidly, and has been used for GPR survey in large areas. One of the important applic... View full abstract»