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A coherent marine radar with 6-m resolution has been developed that measures the radial component of the orbital wave velocity of ocean waves, as well as the mean radial ocean surface velocity. Such a system allows the direct measurement of the ocean wave spectrum by means of 3D-FFT processing of a sequence of coherent radar images collected at a 0.4 Hz image rate. Typically, 256 images are used, covering periods of the order of ten minutes, allowing a modest number of wave groups to bedoi:10.1109/oceans.2008.5151983 fatcat:3nhyp24gozfdnmoaekjgiive64