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Using data from the Envisat ASAR instrument, this paper demonstrates how the high precision radial surface velocity product, which will become available with ESA's Sentinel-1 satellite, can complement the analysis of sea ice motion. Highresolution Doppler frequency measurements are used to estimate the sub-second line-of-sight motion of drifting sea ice in Fram Strait. We compare the method with buoy measurements as well as a recent cross-correlation algorithm for tracking ice between pairs of images. Maximum speeds measured from the time series were in the order of 20 cm/s. Using our method we measured instantaneous speeds reaching 40-60 cm/s.