DocumentCode :
1061485
Title :
Radio Echo Sounding of Pine Island Glacier, West Antarctica: Aperture Synthesis Processing and Analysis of Feasibility From Space
Author :
Héliére, Florence ; Lin, Chung-Chi ; Corr, Hugh ; Vaughan, David
Author_Institution :
European Space Agency, Noordwijk
Volume :
45
Issue :
8
fYear :
2007
Firstpage :
2573
Lastpage :
2582
Abstract :
Airborne radio echo sounding of the West Antarctic Ice Sheet over Pine Island Glacier was performed in the austral summer of 2004/2005 under the National Science Foundation´s West Antarctic Ice Sheet Initiative. The British Antarctic Survey flew its newly developed 150-MHz ice-sounding radar over Pine Island Glacier and collected approximately 35 000 km of sounding data. The synthetic aperture radar (SAR) technique was applied to process those data in order to enhance radar signatures from the bed. As a matter of fact, airborne ice-sounding radar systems are generally affected by surface clutter returns, masking the echoes of internal layers and ice-bedrock transition at a large depth. Focused and unfocused (Doppler filtering) SAR techniques were compared, and their respective advantages/disadvantages were analyzed. Enhancement of bedrock detection at a large depth (> 2000 m) through SAR processing is demonstrated. Finally, a simulation analysis was performed for assessing the feasibility of ice-sheet sounding from space. It is shown that the gain in bed detection threshold is marginal in the satellite sounding geometry. Airborne radar, Antarctica, ice sounding, satellite remote sensing, subglacial topography, synthetic aperture radar (SAR) processing, West Antarctic Ice Sheet.
Keywords :
airborne radar; geophysical signal processing; geophysical techniques; glaciology; ice; synthetic aperture radar; AD 2004; AD 2005; British Antarctic Survey; Doppler filtering; National Science Foundation; Pine Island Glacier; West Antarctic Ice Sheet Initiative; airborne ice sounding radar systems; airborne radio echo sounding; aperture synthesis processing; bedrock detection enhancement; frequency 150 MHz; ice-bedrock transition; internal layer echo masking; radar signature enhancement; satellite sounding geometry; surface clutter returns; synthetic aperture radar; unfocused SAR techniques; west Antarctic ice sheet; Airborne radar; Antarctica; Doppler radar; Ice; Radar clutter; Radar detection; Satellite broadcasting; Spaceborne radar; Surface topography; Synthetic aperture radar; Airborne radar; Antarctica; West Antarctic Ice Sheet; ice sounding; satellite remote sensing; subglacial topography; synthetic aperture radar (SAR) processing;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2007.897433
Filename :
4276887
Link To Document :
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