Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel
Cross-borehole pulse radar has been employed to detect a deeply located empty tunnel. In this paper, effects of underground water collected in the bottom of an empty tunnel on cross-borehole pulse radar signatures are analyzed numerically. B-scan images, stacks of received pulses, are calculated by...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2014/396835 |
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| author | Ji-Hyun Jung Se-Yun Kim |
| author_facet | Ji-Hyun Jung Se-Yun Kim |
| author_sort | Ji-Hyun Jung |
| collection | DOAJ |
| description | Cross-borehole pulse radar has been employed to detect a deeply located empty tunnel. In this paper, effects of underground water collected in the bottom of an empty tunnel on cross-borehole pulse radar signatures are analyzed numerically. B-scan images, stacks of received pulses, are calculated by applying the finite-difference time-domain (FDTD) method for 6 different heights of water from the bottom to the half height inside an empty tunnel. The most important features of an empty tunnel, the fastest time of peak (TOP) and time of arrival (TOA) extracted from the B-scan images, are slowed considerably depending on the increased height of water inside the tunnel. To compensate the weak TOP like that of an empty tunnel, a relation curve is formulated only utilizing measurable parameters of the fastest TOP and the fastest TOA. Then, a unified curve including the effects of two granites with the low and high dielectric properties is derived to cover widely varied dielectric properties of underground rocks. Based on the fastest TOP of an empty tunnel, the average difference between the fastest TOP of an empty tunnel and that of a partially water-filled tunnel decreases from 22.92% to 2.59% after enhancement. |
| format | Article |
| id | doaj-art-49609e01c3064b6ca096417d65d057bc |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-49609e01c3064b6ca096417d65d057bc2025-02-03T06:11:03ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772014-01-01201410.1155/2014/396835396835Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled TunnelJi-Hyun Jung0Se-Yun Kim1Imaging Media Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of KoreaImaging Media Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of KoreaCross-borehole pulse radar has been employed to detect a deeply located empty tunnel. In this paper, effects of underground water collected in the bottom of an empty tunnel on cross-borehole pulse radar signatures are analyzed numerically. B-scan images, stacks of received pulses, are calculated by applying the finite-difference time-domain (FDTD) method for 6 different heights of water from the bottom to the half height inside an empty tunnel. The most important features of an empty tunnel, the fastest time of peak (TOP) and time of arrival (TOA) extracted from the B-scan images, are slowed considerably depending on the increased height of water inside the tunnel. To compensate the weak TOP like that of an empty tunnel, a relation curve is formulated only utilizing measurable parameters of the fastest TOP and the fastest TOA. Then, a unified curve including the effects of two granites with the low and high dielectric properties is derived to cover widely varied dielectric properties of underground rocks. Based on the fastest TOP of an empty tunnel, the average difference between the fastest TOP of an empty tunnel and that of a partially water-filled tunnel decreases from 22.92% to 2.59% after enhancement.http://dx.doi.org/10.1155/2014/396835 |
| spellingShingle | Ji-Hyun Jung Se-Yun Kim Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel International Journal of Antennas and Propagation |
| title | Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel |
| title_full | Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel |
| title_fullStr | Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel |
| title_full_unstemmed | Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel |
| title_short | Enhancement of Cross-Borehole Pulse Radar Signature on a Partially Water-Filled Tunnel |
| title_sort | enhancement of cross borehole pulse radar signature on a partially water filled tunnel |
| url | http://dx.doi.org/10.1155/2014/396835 |
| work_keys_str_mv | AT jihyunjung enhancementofcrossboreholepulseradarsignatureonapartiallywaterfilledtunnel AT seyunkim enhancementofcrossboreholepulseradarsignatureonapartiallywaterfilledtunnel |