Radar Studies of the Sea Surface - An Introduction
A variety of different radars have been used to observe the sea surface. The instruments include scatterometers to measure wind velocity, altimeters to measure wind speed and wave height, synthetic-aperture radars (SAR) to map the radar reflectivity of the surface in order to see ocean surface waves and other phenomena, and two-frequency radars to measure ocean wavelength (Table 1). Each radar was designed to measure a particular variable. Each evolved independently, yet all are essentially wideband super-high-frequency radars that respond in similar ways to surface roughness, and all use the observation of surface roughness to measure some desired or useful surface variable.
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