HR: 17:30h
AN: P14B-07 INVITED    [Abstracts]
TI: Array Processing for Radar Clutter Reduction and Imaging of Ice-Bed Interface
AU: * Gogineni, P
EM: gogineni@cresis.ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Leuschen, C
EM: leuschen@eecs.ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Li, J
EM: jiluli@ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Hoch, A
EM: hocha@cresis.ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Rodriguez-Morales, F
EM: frodriguez@cresis.ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Ledford, J
EM: jledford@ku.edu
AF: Center for Remote Sensing of Ice Sheets, The University of Kansas, 2335 Irving Hill Road, Lawrence, KS 66045, United States
AU: Jezek, K
EM: jezek.1@osu.edu
AF: Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, United States
AB: A major challenge in sounding of fast-flowing glaciers in Greenland and Antarctica is surface clutter, which masks weak returns from the ice-bed interface. The surface clutter is also a major problem in sounding and imaging sub-surface interfaces on Mars and other planets. We successfully applied array-processing techniques to reduce clutter and image ice-bed interfaces of polar ice sheets. These techniques and tools have potential applications to planetary observations. We developed a radar with array-processing capability to measure thickness of fast-flowing outlet glaciers and image the ice-bed interface. The radar operates over the frequency range from 140 to 160 MHz with about an 800- Watt peak transmit power with transmit and receive antenna arrays. The radar is designed such that pulse width and duration are programmable. The transmit-antenna array is fed with a beamshaping network to obtain low sidelobes. We designed the receiver such that it can process and digitize signals for each element of an eight- channel array. We collected data over several fast-flowing glaciers using a five-element antenna array, limited by available hardpoints to mount antennas, on a Twin Otter aircraft during the 2006 field season and a four-element array on a NASA P-3 aircraft during the 2007 field season. We used both adaptive and non-adaptive signal-processing algorithms to reduce clutter. We collected data over the Jacobshavn Isbrae and other fast-flowing outlet glaciers, and successfully measured the ice thickness and imaged the ice-bed interface. In this paper, we will provide a brief description of the radar, discuss clutter-reduction algorithms, present sample results, and discuss the application of these techniques to planetary observations.
DE: 0726 Ice sheets
DE: 0758 Remote sensing
DE: 0794 Instruments and techniques
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting