Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers
An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
1975
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Online Access: | http://dx.doi.org/10.1017/s0022143000034675 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000034675 |
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crcambridgeupr:10.1017/s0022143000034675 2024-03-03T08:46:02+00:00 Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers Bogorodskiy, V. V. Trepov, G. V. Fedorov, B. A. 1975 http://dx.doi.org/10.1017/s0022143000034675 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000034675 en eng Cambridge University Press (CUP) Journal of Glaciology volume 15, issue 73, page 469-470 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1975 crcambridgeupr https://doi.org/10.1017/s0022143000034675 2024-02-08T08:40:23Z An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly to the crystal structure of the glacier and anisotropy caused by the pressure of the upper layers. An analysis of the polarization diagrams obtained is up to the present the main method used for studies of the reflected signal polarization. Evidently using a simple dipole a partially-polarized signal is not distinguishable from one that is elliptically polarized, nor is a nonpolarized signal distinguished from circularly polarized. However, the data recently obtained are of great importance, particularly from studies of glacier crystal structure made in deep core drilling. Possible reasons for the polarization changes of the signal have been analysed. Results of the analyses of the polarization diagrams obtained both at individual points and along extended traverses are discussed. It has been found that the signal reflected from a considerable ice thickness is polarized in such a way that the parallel orientation of the receiving and transmitting dipoles can be disregarded. En route recordings of the signal fluctuations obtained by parallel and orthogonally polarized dipoles are shown. The results of polarization studies are important for practical purposes. For example, bedrock relief sounding carried out with crossed dipoles makes it possible to get rid of interference signals occurring due to scattering from inhomogeneous structures of the upper part of the glacier. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 15 73 469 470 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Bogorodskiy, V. V. Trepov, G. V. Fedorov, B. A. Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
topic_facet |
Earth-Surface Processes |
description |
An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly to the crystal structure of the glacier and anisotropy caused by the pressure of the upper layers. An analysis of the polarization diagrams obtained is up to the present the main method used for studies of the reflected signal polarization. Evidently using a simple dipole a partially-polarized signal is not distinguishable from one that is elliptically polarized, nor is a nonpolarized signal distinguished from circularly polarized. However, the data recently obtained are of great importance, particularly from studies of glacier crystal structure made in deep core drilling. Possible reasons for the polarization changes of the signal have been analysed. Results of the analyses of the polarization diagrams obtained both at individual points and along extended traverses are discussed. It has been found that the signal reflected from a considerable ice thickness is polarized in such a way that the parallel orientation of the receiving and transmitting dipoles can be disregarded. En route recordings of the signal fluctuations obtained by parallel and orthogonally polarized dipoles are shown. The results of polarization studies are important for practical purposes. For example, bedrock relief sounding carried out with crossed dipoles makes it possible to get rid of interference signals occurring due to scattering from inhomogeneous structures of the upper part of the glacier. |
format |
Article in Journal/Newspaper |
author |
Bogorodskiy, V. V. Trepov, G. V. Fedorov, B. A. |
author_facet |
Bogorodskiy, V. V. Trepov, G. V. Fedorov, B. A. |
author_sort |
Bogorodskiy, V. V. |
title |
Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
title_short |
Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
title_full |
Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
title_fullStr |
Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
title_full_unstemmed |
Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers |
title_sort |
polarization changes of radio signals in vertical radio-echo sounding of glaciers |
publisher |
Cambridge University Press (CUP) |
publishDate |
1975 |
url |
http://dx.doi.org/10.1017/s0022143000034675 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000034675 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 15, issue 73, page 469-470 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000034675 |
container_title |
Journal of Glaciology |
container_volume |
15 |
container_issue |
73 |
container_start_page |
469 |
op_container_end_page |
470 |
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1792501847387275264 |