Results 81 to 90 of about 145 (123)
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IEEE Transactions on Geoscience and Remote Sensing, 2016
We propose a polarization-sensitive directional borehole radar with a dipole array and loop antenna in a borehole (DALAB), along with an algorithm for radar signal processing. This radar enables us to discriminate between a vertical conducting cylinder and inhomogeneity in soil in 3-D space.
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We propose a polarization-sensitive directional borehole radar with a dipole array and loop antenna in a borehole (DALAB), along with an algorithm for radar signal processing. This radar enables us to discriminate between a vertical conducting cylinder and inhomogeneity in soil in 3-D space.
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Salt dome exploration by directional borehole radar wireline service
Proceedings of the XIII Internarional Conference on Ground Penetrating Radar, 20103 D borehole radar, a standard logging method? This was the title of the paper, DMT contributed to the GPR conference 2000. Now this question can be answered. Since more than seven years DMT is applying directional borehole wireline services for salt dome exploration up to depths of 2000 m.
K Siever, R Elsen
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A Novel Directional Borehole Radar System Using Optical Electric Field Sensors
IEEE Transactions on Geoscience and Remote Sensing, 2007A directional borehole radar system using an array antenna connected to passive optical electric field sensors was developed and evaluated by laboratory and field experiments. This system uses a single dipole antenna for a transmitter and a four-dipole element circular array for a receiver.
Motoyuki Sato
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Fractures and rock properties estimated by 3D directional borehole radar
2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR), 2015Borehole radar is widely used in civil engineering work such as fault and fracture exploration, salt dome investigation, tunnel detection, UXO detection, exploring locations of foundation piles and sheet metal piling walls, and so on. Borehole radar surveys in resistive rock field have been applied successfully due to the lower attenuation of the rock ...
S Ebihara
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Linear Prediction-Based DOA Estimation for Directional Borehole Radar 3-D Imaging
IEEE Transactions on Geoscience and Remote Sensing, 2019Directional borehole radar (BR) 3-D imaging is a challenging problem due to its limited observation space within a borehole. We present a linear prediction (LP)-based direction-of-arrival (DOA) estimation and a migration-based 3-D imaging algorithm for the directional BR, which is composed of a transmitting antenna and a uniform circular array ...
Sixin Liu, Qi Lu
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Directional borehole radar calibration
Journal of Applied Geophysics, 2007We are developing an innovative low noise borehole radar system that is designed for a single borehole providing 3D imaging capabilities. Harsh and changing operating environments are challenges to the electronic design. Low noise systems are particularly sensitive to operating conditions. After a brief introduction, testing and calibration methods are
O. Borchert, M. Aliman, A. Glasmachers
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A Directional Borehole Radar System
Subsurface Sensing Technologies and Applications, 2002In this paper we present the simulation and design of a directional borehole radar. In addition we discuss an imaging method for the radar system. The antenna system contains an electric dipole which is in one direction shielded by a cylindrical perfectly conducting reflector.
Koen W.A. van Dongen +4 more
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Radar measurements with a directional borehole antenna
SEG Technical Program Expanded Abstracts 1989, 1989SUMMARY A directional borehole antenna has been developed for the RAMAC borehole radar system. Several methods previously used to locate fracture zones in rock are reviewed. In comparison with these methods of analysing radar data the directional antenna makes it possible to obtain the position of a reflector by measuring in a single borehole.
Olle Olsson +4 more
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Directional borehole radar antenna calibration
2010 IEEE Instrumentation & Measurement Technology Conference Proceedings, 2010A directional borehole radar system was developed and tested to assess its directional accuracy. The radar probe employs an Adcock dipole array as its receiving antenna. It is well known that the directional accuracy of the radar probe deteriorates significantly with increased antenna eccentricity.
Kibreab Behaimanot +2 more
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3-D Directional Borehole Radar Imaging Based on Echo Separation
IEEE Transactions on Geoscience and Remote SensingSixin Liu, Qi Lu, Xue Han
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