HF radars operate in the 3–30 MHz frequency range of theelectromagnetic spectrum and are able to obtain informationabout the ocean at ranges up to 150 km. The change infrequency between the transmitted and the backscatteredsignal due to the Doppler effect allows the determination ofsurface currents, wind direction and the oceanwave spectrumover a large area of the ocean surface (Barrick,1972). Therefore,the large coverage obtained by the radar is a major advantageover in-situ wavemeasurement tools, for examplewave buoys,where the spatial coverage is limited to a single point.
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