Results 121 to 130 of about 200 (137)
3-D estimation of a foundation pile using polarization-sensitive directional borehole radar
, 2017 S Ebihara
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Analysis of a directional borehole radar signal with a time-frequency distribution
Fifth International Conferention on Ground Penetrating Radar, 1994 Sato Motoyuki +2 more
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Borehole directional radar system for geological mapping4
Journal of Atmospheric and Terrestrial Physics, 1989Abstract This paper summarizes the progress in the development of the Borehole Directional Radar (BDR), which is a high-powered, high-resolution pulsed system that will be used for mapping geological layers or fractures away from a wellbore. The key to the tool's potential is its ability to accurately measure distance and direction of a lithologie ...
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$\hbox{HE}_{11}$ Mode Effect on Direct Wave in Single-Hole Borehole Radar
IEEE Transactions on Geoscience and Remote Sensing, 2011In this paper, we investigate the influence of radar sonde eccentricity on a direct wave between a transmitting and a receiving antenna in a single-hole borehole radar measurement. We analyze the direct wave using an analytical method with the approximated solution of branch cut integrals and that of residues of poles.
Satoshi Ebihara +2 more
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Probe rotation effects on direction of arrival estimation in array‐type directional borehole radar
Near Surface Geophysics, 2017ABSTRACTThis paper discusses the relationship between feeding line delay compensation and direction of arrival estimation in an array‐type directional borehole radar. In this radar, since the space available for an array antenna is limited by the borehole diameter, direction of arrival estimation is based on small travel time differences among array ...
Satoshi Ebihara +3 more
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Field Experiments Using a Pulse Directional Borehole Radar System with a Dipole Array Antenna
, 2018 Satoshi Ebihara +6 more
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A directional antenna for borehole radar measurements
Geoexploration, 1989O. Olsson +4 more
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Proceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021, 2021
Yuki Tsujikawa +4 more
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Yuki Tsujikawa +4 more
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Design of a Directional Borehole Radar System
2024 Photonics & Electromagnetics Research Symposium (PIERS)Shangyang Zhang +3 more
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