Glaciers and Ice Sheets Interferometric Radar (GISIR)
Glaciers and Ice Sheets Interferometric Radar (GISIR)
ESTO Quarterly Report
October 3, 2005
Description of Task Requirements
Our objective is to develop and demonstrate technology for measuring the 3-d surface and basal topography of terrestrial ice sheets and to map the physical properties of the glacier bed. We will develop and test an airborne VHF and P-band, multi-phase-center, interferometric radar to be deployed in Greenland and Antarctica. Surface clutter and basal signals will be separated using a new algorithm that incorporates spatial information contained in the interferogram. The expected outcome of our work will be the technical capability to image the base and map the 3-dimenional basal topography beneath an ice sheet at up to 5 km depth. Our work will be conducted in the time frame of the International Polar Year.
Summary of Accomplishments
• Project web-site created (www-bprc.mps.ohio-state.edu/rsl/gismo/).
• Science and Engineering team meeting convened on September 26.
• Phase history simulations completed for a spaceborne sensor and used to test the clutter-rejection algorithm
• Flight request submitted to NASA Ames
• Began analysis of ionospheric effects and the influence on interferograms
• Reviewed and finalized radar design
• Provided information on the existing antenna arrays to JPL
• Data collected with array antenna over Antarctica for provided to JPL and Vexcel teams
• Completed simulations of 7-element antenna array for a Twin-Otter aircraft.
Current Progress Description
Simulations: Phase history data from a spaceborne sensor generated by Vexcel and JPL using OSU DEM. Data processed to single look complex images and interferograms. Simple band pass filter applied to extract the basal contribution. Basal interferogram used to reconstruct the basal topography.
Radar System: Preliminary designs for the 150 MHz and 430 MHz radars are complete. Subsequent to the September team meeting, we chose to investigate options for increasing the radar bandwidth to 100 MHz for the aircraft tests. This option allows for greater flexibility in selecting an aircraft platform but does not jeopardize eventual implementation of a narrower bandwidth spaceborne sensor.
Work Plan for Next Reporting Period
• Develop improved surface and bottom topography DEMS for use in simulations
• Conduct phase history simulations to trade elevation, bandwidth and baseline for
finalizing aircraft specification. This requires modification to the simulator for
• Investigate aircraft options with Ames and Wallops (NASA P-3), Dryden (ALTAIR UAV), NSF Office of Polar Programs (C-130)
Schedule Status
On schedule
Delays Problems Experienced
No major problems
Corrective Action/Recovery Plan
None Required
TRL
TRL -3
Comments
None
Publications Presentations
Jezek, K.C., E. Rodriguez, P. Gogineni, J. Curlander, A. Freeman and X. Wu, 2005. A design concept for spaceborne imaging of the base of terrestrial ice sheets and icy bodies in the outer solar system. Presented at WAIS ’05, Sterling VA, Sept. 2005.
Jezek, K.C., E. Rodriguez, P. Gogineni, A. Freeman, J. Curlander, X. Wu, J. Paden and C. Allen submitted. Glaciers and Ice Sheets Mapping Orbiter. Journal of Geophysical Research.
Other
PDF of WAIS’05 Poster attached separately
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