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Phased array HF radars are widely used for mapping surface currents and wind directions at high resolution in time and space. The beam is formed using simple physical optics principles that produce sidelobes. Several authors have alluded to errors produced in the measurements by sea echo energy in the sidelobes. Here we simulate the effect of sidelobes in surface current and wind direction measurements,...
Within this paper, we describe a methodology to retrieve very high-resolution ocean surface currents from short video sequences of water surface waves. The video sequences were acquired in the range of visible light with a small, nadir looking 4k video camera attached to an off the shelf quadcopter. The quadcopter is equipped with an actively controlled gimbal for stabilization of the video camera...
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