Scatterometer

"A high-frequency microwave radar designed specifically to measure backscattered radiation. Over ocean surfaces, measurements of backscattered radiation in the microwave spectral region can be used to derive maps of surface wind speed and direction." (National Aeronautics and Space Administration, 2018)

Sources

"Remote Sensors". Earthdata, National Aeronautics and Space Administration. Last modified December 11, 2018.
https://earthdata.nasa.gov/user-resources/remote-sensors.
Accessed February 13, 2019.