Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar
Traditionally, helicopter-borne ground-penetrating radar (GPR) systems are operated with a single pair of bistatic dipole antennas to measure the thickness of glaciers. We demonstrate numerically that the directivity of the radiation pattern of single airborne dipoles do not correspond to an ideal f...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
International Glaciological Society
2019
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11850/318891 https://doi.org/10.3929/ethz-b-000318891 |
id |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/318891 |
---|---|
record_format |
openpolar |
spelling |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/318891 2023-05-15T16:57:29+02:00 Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar Langhammer, Lisbeth Rabenstein, Lasse Schmid, Lino Bauder, Andreas Grab, Melchior Schaer, Philipp Maurer, Hansruedi 2019-02 application/application/pdf https://hdl.handle.net/20.500.11850/318891 https://doi.org/10.3929/ethz-b-000318891 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2018.99 info:eu-repo/semantics/altIdentifier/wos/000462017000009 http://hdl.handle.net/20.500.11850/318891 doi:10.3929/ethz-b-000318891 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Glaciology, 65 (259) radio-echo sounding mountain glaciers ice thickness measurements ground-penetrating radar Glacier geophysics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/318891 https://doi.org/10.3929/ethz-b-000318891 https://doi.org/10.1017/jog.2018.99 2022-04-25T13:45:09Z Traditionally, helicopter-borne ground-penetrating radar (GPR) systems are operated with a single pair of bistatic dipole antennas to measure the thickness of glaciers. We demonstrate numerically that the directivity of the radiation pattern of single airborne dipoles do not correspond to an ideal full-space solution if the antennas are employed at typical flight heights. These directionality effects can degrade the quality of the subsurface images significantly, when the GPR antennas are orientated unfavorably. Since an adjustment of the antenna orientation is impractical during flight, we have developed a novel dual-polarization helicopter-borne GPR system consisting of two orthogonal pairs of commercial antennas in broadside configuration. To overcome the image quality deficits of the individual channels, we apply a pseudo-scalar approach in which we combine the data of both polarizations. Results of helicopter-borne GPR surveys on two alpine glaciers in Switzerland reveal more coherent bedrock reflections in the summed data compared with single dipole pair profiles. Generally, the dual-polarization setup is more suitable than a single antenna systems, because it is more versatile and less prone to directional effects caused by the placement of the dipole antennas in relation to undulating subsurface reflectors. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Journal of Glaciology ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
radio-echo sounding mountain glaciers ice thickness measurements ground-penetrating radar Glacier geophysics |
spellingShingle |
radio-echo sounding mountain glaciers ice thickness measurements ground-penetrating radar Glacier geophysics Langhammer, Lisbeth Rabenstein, Lasse Schmid, Lino Bauder, Andreas Grab, Melchior Schaer, Philipp Maurer, Hansruedi Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
topic_facet |
radio-echo sounding mountain glaciers ice thickness measurements ground-penetrating radar Glacier geophysics |
description |
Traditionally, helicopter-borne ground-penetrating radar (GPR) systems are operated with a single pair of bistatic dipole antennas to measure the thickness of glaciers. We demonstrate numerically that the directivity of the radiation pattern of single airborne dipoles do not correspond to an ideal full-space solution if the antennas are employed at typical flight heights. These directionality effects can degrade the quality of the subsurface images significantly, when the GPR antennas are orientated unfavorably. Since an adjustment of the antenna orientation is impractical during flight, we have developed a novel dual-polarization helicopter-borne GPR system consisting of two orthogonal pairs of commercial antennas in broadside configuration. To overcome the image quality deficits of the individual channels, we apply a pseudo-scalar approach in which we combine the data of both polarizations. Results of helicopter-borne GPR surveys on two alpine glaciers in Switzerland reveal more coherent bedrock reflections in the summed data compared with single dipole pair profiles. Generally, the dual-polarization setup is more suitable than a single antenna systems, because it is more versatile and less prone to directional effects caused by the placement of the dipole antennas in relation to undulating subsurface reflectors. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Langhammer, Lisbeth Rabenstein, Lasse Schmid, Lino Bauder, Andreas Grab, Melchior Schaer, Philipp Maurer, Hansruedi |
author_facet |
Langhammer, Lisbeth Rabenstein, Lasse Schmid, Lino Bauder, Andreas Grab, Melchior Schaer, Philipp Maurer, Hansruedi |
author_sort |
Langhammer, Lisbeth |
title |
Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
title_short |
Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
title_full |
Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
title_fullStr |
Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
title_full_unstemmed |
Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
title_sort |
glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
publisher |
International Glaciological Society |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/318891 https://doi.org/10.3929/ethz-b-000318891 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, 65 (259) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2018.99 info:eu-repo/semantics/altIdentifier/wos/000462017000009 http://hdl.handle.net/20.500.11850/318891 doi:10.3929/ethz-b-000318891 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/318891 https://doi.org/10.3929/ethz-b-000318891 https://doi.org/10.1017/jog.2018.99 |
_version_ |
1766049033872211968 |