Surface ocean waves can be measured by a number of different radar remote sensing techniques, and there are a lot of commercially available instruments to help do so.
One problem from the user's point of view is that many of these instruments are commonly called simply 'wave radars', quite unprecise and often misleading, as their operation may be based on very different principles given the instrument's different qualities.
Miros's article gives a brief description of the most common ground-based radar remote sensing techniques available, as well as some of their advantages and disadvantages.
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