scholarly journals Radio-Echo Sounding of Mountain Glaciers

1975 ◽  
Vol 15 (73) ◽  
pp. 471-471
Author(s):  
I. A. Zotikov ◽  
V. S. Luchininov ◽  
Yu. Ya. Macheket ◽  
L. A. Suchanov
Keyword(s):  
Geophysical Methods ◽  
Polar Urals ◽  
Mountain Glaciers ◽  
Ice Surface ◽  
Radio Echo Sounding ◽  
Thermal Drilling ◽  
Central Caucasus ◽  
Subglacial Topography ◽  
Being Moved ◽  
Echo Sounding

AbstractExperiments on radio-echo sounding of mountain glaciers have been done on Lednik Marukh (west Caucasus), Lednik Bezingy and Lednik Dzhankuat (central Caucasus), Lednik Gergety (east Caucasus), and Lednik IGAN (Polar Urals) in 1967-71 as a part of the I.H.D. programme. Radio altimeters operating at a frequency of 440 MHz with a pulse duration 0.5 μ5 and with an assumed radio-echo system performance of 130 dB were used. The apparatus was operated from the ice surface (using sledge or vehicle) and partly from a helicopter. Some measurements have been made while the apparatus was being moved continuously along longitudal and transverse profiles of the glacier. Some of the measurements have been made at separate points on the glacier. The methods of measurement and interpretation have been worked out. Data on ice thickness, subglacial topography, and internal structure of some mountain glaciers have been obtained and compared with data got using other geophysical methods and thermal drilling. There is agreement between the results.

scholarly journals Radio-Echo Sounding of Mountain Glaciers

1975 ◽  
Vol 15 (73) ◽  
pp. 471 ◽  
Author(s):  
I. A. Zotikov ◽  
V. S. Luchininov ◽  
Yu. Ya. Macheket ◽  
L. A. Suchanov
Keyword(s):  
Geophysical Methods ◽  
Polar Urals ◽  
Mountain Glaciers ◽  
Ice Surface ◽  
Radio Echo Sounding ◽  
Thermal Drilling ◽  
Central Caucasus ◽  
Subglacial Topography ◽  
Being Moved ◽  
Echo Sounding

Abstract Experiments on radio-echo sounding of mountain glaciers have been done on Lednik Marukh (west Caucasus), Lednik Bezingy and Lednik Dzhankuat (central Caucasus), Lednik Gergety (east Caucasus), and Lednik IGAN (Polar Urals) in 1967-71 as a part of the I.H.D. programme. Radio altimeters operating at a frequency of 440 MHz with a pulse duration 0.5 μ5 and with an assumed radio-echo system performance of 130 dB were used. The apparatus was operated from the ice surface (using sledge or vehicle) and partly from a helicopter. Some measurements have been made while the apparatus was being moved continuously along longitudal and transverse profiles of the glacier. Some of the measurements have been made at separate points on the glacier. The methods of measurement and interpretation have been worked out. Data on ice thickness, subglacial topography, and internal structure of some mountain glaciers have been obtained and compared with data got using other geophysical methods and thermal drilling. There is agreement between the results.

scholarly journals Results from the Radio Echo-Sounding on Parts of the Jostedalsbreen Ice Cap, Norway

1986 ◽  
Vol 8 ◽  
pp. 156-158 ◽  
Author(s):  
Arne Chr. Saetrang ◽  
Bjørn Wold
Keyword(s):  
Ice Thickness ◽  
Ice Cap ◽  
Radio Echo Sounding ◽  
Subglacial Topography ◽  
Echo Sounding

The paper describes instrumentation, navigation methods, and interpretation problems from radio echo-sounding on parts of Jostedalsbreen. A map of the subglacial topography is presented. Ice thickness ranges from 60 m to 600 m with most sections between 150 m and 300 m.

scholarly journals New maps of the ice thickness and subglacial topography in Dronning Maud Land, Antarctica, determined by means of airborne radio-echo sounding

1999 ◽  
Vol 29 ◽  
pp. 267-272 ◽  
Author(s):  
D. Steinhage ◽  
U. Nixdorf ◽  
U. Meyer ◽  
H. Miller
Keyword(s):  
Three Dimensional ◽  
Austral Summer ◽  
Ice Thickness ◽  
Ice Volume ◽  
Site Survey ◽  
Radio Echo Sounding ◽  
First Results ◽  
Dronning Maud Land ◽  
Subglacial Topography ◽  
Echo Sounding

AbstractSince the austral summer of 1994-95 the Alfred Wegener Institute has carried out airborne radio-echo sounding (RES) measurements in Antarctica with its newly designed RES system. Since 1995-96 an ongoing pre-site survey for an ice-coring drill site in Dronning Maud Land has been carried out as part of the European Project for Ice Goring in Antarctica. The survey covers an area of 948 000 km2, with >49 500 km of airborne RES obtained from >200 hours of flight operation flown during the period 1994-97. In this paper, first results of the airborne RES survey are graphically summarized as newly derived maps of the ice thickness and subglacial topography, as well as a three-dimensional view of surface and subglacial bed and outcrop topography, revealing a total ice volume of 1.48 x 106 km3.

scholarly journals Results from the Radio Echo-Sounding on Parts of the Jostedalsbreen Ice Cap, Norway

1986 ◽  
Vol 8 ◽  
pp. 156-158 ◽  
Author(s):  
Arne Chr. Saetrang ◽  
Bjørn Wold
Keyword(s):  
Ice Thickness ◽  
Ice Cap ◽  
Radio Echo Sounding ◽  
Subglacial Topography ◽  
Echo Sounding

The paper describes instrumentation, navigation methods, and interpretation problems from radio echo-sounding on parts of Jostedalsbreen. A map of the subglacial topography is presented. Ice thickness ranges from 60 m to 600 m with most sections between 150 m and 300 m.

scholarly journals Coherent large beamwidth processing of radio-echo sounding data

2018 ◽  
Vol 12 (9) ◽  
pp. 2969-2979 ◽  
Author(s):  
Anton Heister ◽  
Rolf Scheiber
Keyword(s):  
Ice Sheets ◽  
Internal Layers ◽  
Spectral Filtering ◽  
Polar Ice ◽  
Bed Topography ◽  
Ice Surface ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets ◽  
Slope Estimation ◽  
Echo Sounding

Abstract. Coherent processing of radio-echo sounding data of polar ice sheets is known to provide an indication of bedrock properties and detection of internal layers. We investigate the benefits of coherent processing of a large azimuth beamwidth to retrieve and characterize the orientation and angular backscattering properties of the surface and subsurface features. MCRDS data acquired over two distinct test areas in Greenland are used to demonstrate the specular backscattering properties of the ice surface and of the internal layers, as well as the much wider angular response of the bedrock. The coupling of internal layers' orientation with the bed topography is shown to increase with depth. Spectral filtering can be used to increase the SNR of the internal layers and mitigate the surface multiple. The variance of the bed backscattering can be used to characterize the bed return specularity. The use of the SAR-focused RES data ensures the correct azimuth positioning of the internal layers for the subsequent slope estimation.

scholarly journals Internal Reflecting Horizons in Spitsbergen Glaciers

1987 ◽  
Vol 9 ◽  
pp. 5-10 ◽  
Author(s):  
J. L. Bamber
Keyword(s):  
Ice Core ◽  
Entire Length ◽  
Internal Layer ◽  
Reflection Coefficients ◽  
Constant Depth ◽  
Strength Data ◽  
Ice Surface ◽  
Radio Echo Sounding ◽  
Echo Sounding

A single pronounced internal reflecting horizon has been observed on radio echo-sounding from over 30 glaciers in Spitsbergen. They are often present along the entire length of the glacier, remaining at a fairly constant depth (100–200 m) below the ice surface. Echo-strength data from radio echo-sounding have been used to obtain reflection coefficients, for these horizons, of between -15 and -25 dB. Combined with results of ice-core studies, the possible causes of this internal layer are investigated. The presence of water is found to be the most likely explanation, indicating the existence, at depth, of a layer of temperate ice.

scholarly journals Benefits of Coherent Large Beamwidth Processing of Radio-Echo Sounding Data

2018 ◽  
Author(s):  
Anton Heister ◽  
Rolf Scheiber
Keyword(s):  
Ice Sheets ◽  
Internal Layers ◽  
Spectral Filtering ◽  
Polar Ice ◽  
Angular Response ◽  
Bed Topography ◽  
Ice Surface ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets ◽  
Echo Sounding

Abstract. Coherent processing of radio echo sounding data of polar ice sheets is known to provide indication of bedrock properties and detection of internal layers. We investigate the benefits of coherent processing of a large azimuth beamwidth to retrieve and characterize the orientation and angular backscattering properties of the surface and subsurface features. MCoRDS data acquired over two distinct test areas in Greenland are used to demonstrate the specular backscattering properties of the ice surface and of the internal layers, as well as the much wider angular response of the bedrock. The coupling of internal layers' orientation with the bed topography is shown to increase with depth. Spectral filtering can be used to increase the SNR of the internal layers and for mitigating the surface multiple.

scholarly journals Removal of ‘strip noise’ in radio-echo sounding data using combined wavelet and 2-D DFT filtering

2019 ◽  
Vol 61 (81) ◽  
pp. 124-134
Author(s):  
Bangbing Wang ◽  
Bo Sun ◽  
Jiaxin Wang ◽  
Jamin Greenbaum ◽  
Jingxue Guo ◽  
...  
Keyword(s):  
Wavelet Transforms ◽  
Radar Data ◽  
Discrete Wavelet ◽  
Multi Scale ◽  
Ice Surface ◽  
Fourier Filtering ◽  
Radio Echo Sounding ◽  
Instrument Noise ◽  
Echo Sounding

ABSTRACTRadio-echo sounding (RES) can be used to understand ice-sheet processes, englacial flow structures and bed properties, making it one of the most popular tools in glaciological exploration. However, RES data are often subject to ‘strip noise’, caused by internal instrument noise and interference, and/or external environmental interference, which can hamper measurement and interpretation. For example, strip noise can result in reduced power from the bed, affecting the quality of ice thickness measurements and the characterization of subglacial conditions. Here, we present a method for removing strip noise based on combined wavelet and two-dimensional (2-D) Fourier filtering. First, we implement discrete wavelet decomposition on RES data to obtain multi-scale wavelet components. Then, 2-D discrete Fourier transform (DFT) spectral analysis is performed on components containing the noise. In the Fourier domain, the 2-D DFT spectrum of strip noise keeps its linear features and can be removed with a ‘targeted masking’ operation. Finally, inverse wavelet transforms are performed on all wavelet components, including strip-removed components, to restore the data with enhanced fidelity. Model tests and field-data processing demonstrate the method removes strip noise well and, incidentally, can remove the strong first reflector from the ice surface, thus improving the general quality of radar data.

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