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Design methods for the UHF surface currents radar system are presented. The UHF radar system is developed on the basis of the successful OSMAR system. It is modified to operate at UHF (310MHz) and wide FM sweep width (5-10MHz) to match the expected water wavelengths and channel dimension. Transmit power is under 5W, and the maximum range over fresh water will be more than 1Km. All hardware modules had been finished; simulation and field test proved this system can be used successfully.