نتایج جستجو برای: d gpr sections

تعداد نتایج: 663871  

2009
Hirotomo NAKAJIMA Yoshinori SHIMADA Toshihiro SOMEKAWA Masayuki FUJITA Kazuo A. TANAKA

Ground penetrating radar (GPR) is a nondestructive sensor technology for detecting underground objects. GPR requires large-aperture antennas to survey a remote location precisely because of the expansion of microwaves. We propose a laser-driven GPR (LGPR) that uses microwave radiation from a laser plasma to achieve remote sensing. LGPR is expected to provide good spatial resolution with a small...

Journal: :Journal of Atmospheric and Oceanic Technology 2016

Journal: :IEEE Transactions on Geoscience and Remote Sensing 2021

An iterative multiscaling approach for solving the electromagnetic inverse scattering problem related to imaging of shallow subsurface targets with ground-penetrating radar (GPR) is proposed. The combines zooming properties technique reconstruction capabilities an Inexact-Newton (IN) method developed in <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.or...

Journal: :Journal of immunology 2000
A M Norment L Y Bogatzki B N Gantner M J Bevan

Chemokines are likely to play an important role in regulating the trafficking of developing T cells within the thymus. By using anti-CD3varepsilon treatment of recombinase-activating gene 2 (Rag2-/-) mice to mimic pre-TCR signaling and drive thymocyte development to the double positive stage, we have identified murine GPR-9-6 as a chemokine receptor whose expression is strongly induced followin...

2006
RADAR BRIDGE

Traditional GPR Surveys. High-speed GPR surveys have been performed for many years to map the condition of aging bridge deck structures. Most often, one or more 1.0 GHz horn antennas are driven along unique survey paths spaced anywhere from 3 to 4ft apart—and 2 to 3 GPR scans are collected along every linear foot of the deck surface that is being sampled. Surface dielectric properties, signal a...

Journal: :I. J. Robotics Res. 2010
Paul Timothy Furgale Tim D. Barfoot Nadeem Ghafoor Kevin Williams Gordon Osinski

While there has been much interest in developing ground-penetrating radar (GPR) technology for rover-based planetary exploration, relatively little work has been done on the data collection process. Starting from the manual method, we fully automate GPR data collection using only sensors typically found on a rover. Further, we produce two novel data products: (1) a three-dimensional, photoreali...

2008
C. Ozdemir S. Demirci E. Yigit

It is well known in B-scan ground penetrating radar (GPR) imagery that the underground scatterers generally exhibit defocused, hyperbolic characteristics. This is mainly due to the data collection scheme and the finite beam width of the main lobe of the GPR antenna. To invert this undesirable effect and obtain focused images, various migration or focusing algorithms have been developed. In this...

2015
Rafael Boloix-Tortosa Eva Arias-de-Reyna F. Javier Payan-Somet Juan J. Murillo-Fuentes

In this paper we propose a novel Bayesian kernel based solution for regression in complex fields. We develop the formulation of the Gaussian process for regression (GPR) to deal with complex-valued outputs. Previous solutions for kernels methods usually assume a complexification approach, where the real-valued kernel is replaced by a complexvalued one. However, based on the results in complex-v...

2013
Anh Phuong Tran Frédéric André Christophe Craeye Sébastien Lambot

The selection of a near-field or far-field ground-penetrating radar (GPR) model is an important question for an accurate but computationally effective characterization of medium electrical properties using full-wave inverse modeling. In this study, we determined an antenna height threshold for the near-field and farfield full-wave GPR models by analyzing the variation of the spatial derivatives...

Journal: :Remote Sensing 2023

Pavement condition largely determines its long-term behavior and is of paramount importance for rehabilitation maintenance management. The use non-destructive testing (NDT) systems to assess pavement has gained much popularity. Often, well-known NDT are combined take full advantage the capabilities each system. Combining independent optimize assessment process a scientific challenge. With this ...

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