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...
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ftdoajarticles:oai:doaj.org/article:908042fa2d094d7fabac52cb4905e433 2023-05-15T16:57:33+02:00 Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar LISBETH LANGHAMMER LASSE RABENSTEIN LINO SCHMID ANDREAS BAUDER MELCHIOR GRAB PHILIPP SCHAER HANSRUEDI MAURER 2019-02-01T00:00:00Z https://doi.org/10.1017/jog.2018.99 https://doaj.org/article/908042fa2d094d7fabac52cb4905e433 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143018000990/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.99 0022-1430 1727-5652 https://doaj.org/article/908042fa2d094d7fabac52cb4905e433 Journal of Glaciology, Vol 65, Pp 123-135 (2019) glacier geophysics ground-penetrating radar ice thickness measurements mountain glaciers radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2018.99 2023-03-12T01:30:59Z 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. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 65 249 123 135 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier geophysics ground-penetrating radar ice thickness measurements mountain glaciers radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
glacier geophysics ground-penetrating radar ice thickness measurements mountain glaciers radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 LISBETH LANGHAMMER LASSE RABENSTEIN LINO SCHMID ANDREAS BAUDER MELCHIOR GRAB PHILIPP SCHAER HANSRUEDI MAURER Glacier bed surveying with helicopter-borne dual-polarization ground-penetrating radar |
topic_facet |
glacier geophysics ground-penetrating radar ice thickness measurements mountain glaciers radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
author |
LISBETH LANGHAMMER LASSE RABENSTEIN LINO SCHMID ANDREAS BAUDER MELCHIOR GRAB PHILIPP SCHAER HANSRUEDI MAURER |
author_facet |
LISBETH LANGHAMMER LASSE RABENSTEIN LINO SCHMID ANDREAS BAUDER MELCHIOR GRAB PHILIPP SCHAER HANSRUEDI MAURER |
author_sort |
LISBETH LANGHAMMER |
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 |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2018.99 https://doaj.org/article/908042fa2d094d7fabac52cb4905e433 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 65, Pp 123-135 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143018000990/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.99 0022-1430 1727-5652 https://doaj.org/article/908042fa2d094d7fabac52cb4905e433 |
op_doi |
https://doi.org/10.1017/jog.2018.99 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
249 |
container_start_page |
123 |
op_container_end_page |
135 |
_version_ |
1766049123422699520 |