For the ice sounding of Antarctica from space, a P-band radar at 435 MHz is the only option which complies with presentITU regulations. At this frequency the ice surface cannot be considered smooth, leading to high ambiguous returns.Besides simulation, data acquired by airborne sensors are used to evaluate algorithms for surface clutter suppression andmitigation possibilities of ionospheric influence. This paper presents onrst an analysis of sub-surface along track focussingin the presence of azimuth slopes. For across-track clutter suppression the multiple-aperture technique in nadir lookinggeometry is considered, in a repeat-pass cononguration as the most general case. Airborne data acquired by the E-SARsystem of DLR during ICESAR 2007 campaign are investigated to address feasibility questions for the spaceborne case.
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