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 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.

Radio Echo Sounding of Polar Ice Sheets

Nature ◽  
1964 ◽  
Vol 204 (4957) ◽  
pp. 420-421 ◽  
Author(s):  
J. T. BAILEY ◽  
S. EVANS ◽  
G. de Q. ROBIN
Keyword(s):  
Ice Sheets ◽  
Polar Ice ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets ◽  
Echo Sounding

scholarly journals Dielectric Variability of a 130 m Antarctic Ice Core: Implications for Radar Sounding

1988 ◽  
Vol 11 ◽  
pp. 95-99 ◽  
Author(s):  
J. C. Moore
Keyword(s):  
Reflection Coefficient ◽  
Smooth Function ◽  
High Frequency ◽  
Ice Core ◽  
Ice Sheets ◽  
Layer Model ◽  
Polar Ice ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets ◽  
Echo Sounding

A 130 m long ice core has been dielectrically profiled. From an analysis of the measurements, we obtain a profile of the high-frequency (radio-echo) conductivity. This profile has been represented by a simplified 700 layer model. The model has layers of differing conductivities, permittivities and thicknesses. A reflection-coefficient log can be calculated, assuming that permittivity is a smooth function of depth. Variations in conductivity are shown to be more likely sources of internal reflections from depths greater than a few hundred metres than changes in permittivity caused by density changes. The log is convoluted with input pulses of various frequencies and pulse lengths in order to produce synthetic radargrams. These show features that correspond to the internal reflections typically seen when radio echo-sounding polar ice sheets.

scholarly journals Dielectric Variability of a 130 m Antarctic Ice Core: Implications for Radar Sounding

1988 ◽  
Vol 11 ◽  
pp. 95-99 ◽  
Author(s):  
J. C. Moore
Keyword(s):  
Reflection Coefficient ◽  
Smooth Function ◽  
High Frequency ◽  
Ice Core ◽  
Ice Sheets ◽  
Layer Model ◽  
Polar Ice ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets ◽  
Echo Sounding

A 130 m long ice core has been dielectrically profiled. From an analysis of the measurements, we obtain a profile of the high-frequency (radio-echo) conductivity. This profile has been represented by a simplified 700 layer model. The model has layers of differing conductivities, permittivities and thicknesses. A reflection-coefficient log can be calculated, assuming that permittivity is a smooth function of depth. Variations in conductivity are shown to be more likely sources of internal reflections from depths greater than a few hundred metres than changes in permittivity caused by density changes. The log is convoluted with input pulses of various frequencies and pulse lengths in order to produce synthetic radargrams. These show features that correspond to the internal reflections typically seen when radio echo-sounding polar ice sheets.

scholarly journals Radio-Echo Sounding: Glaciological Interpretations and Applications

1975 ◽  
Vol 15 (73) ◽  
pp. 49-64 ◽  
Author(s):  
G. de Q. Robin
Keyword(s):  
Dielectric Properties ◽  
Ice Sheets ◽  
Future Application ◽  
Detailed Knowledge ◽  
Radio Waves ◽  
Polar Ice ◽  
Irregular Distribution ◽  
The Future ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets

AbstractAfter a brief review of factors relevant to the propagation of radio waves in ice, problems of profiling the upper and bedrock surfaces of ice sheets are considered. These include deconvolution of echo traces and accurate navigation. Results already available not only provide knowledge of sub-ice geomorphology, but also confirm our general ideas on interaction of temperature and flow in large ice sheets. Difficulties encountered in the study of temperate glaciers appear to be due to irregular dielectric properties of the ice mass, which in turn suggest an irregular distribution of water. In the future, application of radio-echo methods should lead to more detailed knowledge of accumulation and ablation over ice masses, improve our understanding of temperatures at great depths in polar ice sheets, and give data on ice movement from central areas of ice sheets.

scholarly journals Radio-Echo Sounding: Glaciological Interpretations and Applications

1975 ◽  
Vol 15 (73) ◽  
pp. 49-64 ◽  
Author(s):  
G. de Q. Robin
Keyword(s):  
Dielectric Properties ◽  
Ice Sheets ◽  
Future Application ◽  
Detailed Knowledge ◽  
Radio Waves ◽  
Polar Ice ◽  
Irregular Distribution ◽  
The Future ◽  
Radio Echo Sounding ◽  
Polar Ice Sheets

AbstractAfter a brief review of factors relevant to the propagation of radio waves in ice, problems of profiling the upper and bedrock surfaces of ice sheets are considered. These include deconvolution of echo traces and accurate navigation. Results already available not only provide knowledge of sub-ice geomorphology, but also confirm our general ideas on interaction of temperature and flow in large ice sheets. Difficulties encountered in the study of temperate glaciers appear to be due to irregular dielectric properties of the ice mass, which in turn suggest an irregular distribution of water. In the future, application of radio-echo methods should lead to more detailed knowledge of accumulation and ablation over ice masses, improve our understanding of temperatures at great depths in polar ice sheets, and give data on ice movement from central areas of ice sheets.

scholarly journals Spatial stability of Ice Stream D and its tributaries, West Antarctica, revealed by radio-echo sounding and interferometry

2003 ◽  
Vol 37 ◽  
pp. 377-382 ◽  
Author(s):  
Martin J. Siegert ◽  
Antony J. Payne ◽  
Ian Joughin
Keyword(s):  
Interferometric Synthetic Aperture Radar ◽  
Internal Layers ◽  
Lateral Migration ◽  
West Antarctica ◽  
Ice Streams ◽  
Ice Flow ◽  
Ice Surface ◽  
Ice Stream ◽  
Radio Echo Sounding ◽  
Echo Sounding

AbstractIt has been shown recently that ice streams are fed by fast-flowing tributaries occupying well-defined subglacial troughs and with shared source areas. Here, ice-penetrating radio-echo sounding (RES) data are analyzed in conjunction with ice surface velocities derived from interferometric synthetic aperture radar (InSAR), to determine the englacial properties of tributaries feeding Ice Stream D, West Antarctica. All of Ice Stream D’s tributaries are coincident with “buckled” internal ice-sheet layers, most probably deformed by the processes responsible for enhanced ice flow. Between the tributaries well-preserved internal layers occur. The data reveal that no lateral migration of the ice-stream tributaries has occurred recently. This is consistent with thermomechanical ice-flow modelling, which indicates that the flow of Ice Stream D is controlled by a subglacial trough and is unaffected by changes to the flow of neighbouring Ice Stream C.

Shallow-Layers-Detection Ice Sounding Radar for Mapping of Polar Ice Sheets

2021 ◽  
pp. 1-10
Author(s):  
Bo Zhao ◽  
Yueyi Zhang ◽  
Shinan Lang ◽  
Yan Liu ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Ice Sheets ◽  
Polar Ice ◽  
Polar Ice Sheets
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