Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies
Abstract We have built a radio-echo sounder which utilizes a low-frequency broad-band impulse transmitter and a microprocessor-based digital-recording system. The unit is mounted on skis and power is delivered by a small generator and batteries. The receiver uses a portable digital storage oscillosc...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/s0022143000007127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007127 |
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crcambridgeupr:10.1017/s0022143000007127 2024-03-03T08:39:18+00:00 Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies Jacobel, Robert W. Anderson, Stefan K. Rioux, Dennis F. 1988 http://dx.doi.org/10.1017/s0022143000007127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007127 en eng Cambridge University Press (CUP) Journal of Glaciology volume 34, issue 118, page 349-354 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1988 crcambridgeupr https://doi.org/10.1017/s0022143000007127 2024-02-08T08:40:23Z Abstract We have built a radio-echo sounder which utilizes a low-frequency broad-band impulse transmitter and a microprocessor-based digital-recording system. The unit is mounted on skis and power is delivered by a small generator and batteries. The receiver uses a portable digital storage oscilloscope which passes data via a microprocessor unit to a cassette tape for off-line analysis on a personal computer. Though originally intended primarily for sounding temperate ice, the system has been tested in the Antarctic during the 1987–88 field season with good results. The radar performed well there and also in field tests and subsequent studies on South Cascade Glacier, Washington, and many interesting results were obtained. An oblique incidence profile, where transmitter-receiver separation varied, was used to study the dielectric permittivity of the ice and to locate internal layers at shallow depths. The sounder was also deployed in conjunction with hot-water drilling experiments attempting to create cavities at known locations within the ice. Wave forms from different transmitter–receiver orientations around the bore hole were combined in the off-line analysis to produce a more directional synthetic aperture emphasizing returns from the bore-hole region. Changes in the radar echoes from within the ice were not seen during these experiments, possibly because the drilling was not able to create regions with dimensions or orientations approximating those of naturally occurring cavities. Article in Journal/Newspaper Antarc* Antarctic Journal of Glaciology Cambridge University Press Antarctic The Antarctic Cascade Glacier ENVELOPE(-140.504,-140.504,60.249,60.249) Journal of Glaciology 34 118 349 354 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Jacobel, Robert W. Anderson, Stefan K. Rioux, Dennis F. Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
topic_facet |
Earth-Surface Processes |
description |
Abstract We have built a radio-echo sounder which utilizes a low-frequency broad-band impulse transmitter and a microprocessor-based digital-recording system. The unit is mounted on skis and power is delivered by a small generator and batteries. The receiver uses a portable digital storage oscilloscope which passes data via a microprocessor unit to a cassette tape for off-line analysis on a personal computer. Though originally intended primarily for sounding temperate ice, the system has been tested in the Antarctic during the 1987–88 field season with good results. The radar performed well there and also in field tests and subsequent studies on South Cascade Glacier, Washington, and many interesting results were obtained. An oblique incidence profile, where transmitter-receiver separation varied, was used to study the dielectric permittivity of the ice and to locate internal layers at shallow depths. The sounder was also deployed in conjunction with hot-water drilling experiments attempting to create cavities at known locations within the ice. Wave forms from different transmitter–receiver orientations around the bore hole were combined in the off-line analysis to produce a more directional synthetic aperture emphasizing returns from the bore-hole region. Changes in the radar echoes from within the ice were not seen during these experiments, possibly because the drilling was not able to create regions with dimensions or orientations approximating those of naturally occurring cavities. |
format |
Article in Journal/Newspaper |
author |
Jacobel, Robert W. Anderson, Stefan K. Rioux, Dennis F. |
author_facet |
Jacobel, Robert W. Anderson, Stefan K. Rioux, Dennis F. |
author_sort |
Jacobel, Robert W. |
title |
Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
title_short |
Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
title_full |
Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
title_fullStr |
Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
title_full_unstemmed |
Instruments and Methods: A Portable Digital Data-Acquisition System for Surface-Based Ice-Radar Studies |
title_sort |
instruments and methods: a portable digital data-acquisition system for surface-based ice-radar studies |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1017/s0022143000007127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007127 |
long_lat |
ENVELOPE(-140.504,-140.504,60.249,60.249) |
geographic |
Antarctic The Antarctic Cascade Glacier |
geographic_facet |
Antarctic The Antarctic Cascade Glacier |
genre |
Antarc* Antarctic Journal of Glaciology |
genre_facet |
Antarc* Antarctic Journal of Glaciology |
op_source |
Journal of Glaciology volume 34, issue 118, page 349-354 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000007127 |
container_title |
Journal of Glaciology |
container_volume |
34 |
container_issue |
118 |
container_start_page |
349 |
op_container_end_page |
354 |
_version_ |
1792494773711405056 |