NASA's Cyclone Global Navigation Satellite System (CYGNSS) uses eight micro-satellites to measure wind speeds over oceans to improve forecasting for extreme weather like cyclones. 

The Delay Doppler Mapping Instrument onboard the CYGNSS platform, uses direct doppler radar signals to pinpoint CYGNSS observatory positions, while using reflected signals to measure ocean roughness, which is used to indicate wind speeds. While orbiting at 510 km above Earth's surface, CYGNSS provides a unique vantage point to observe wind speeds during intense storms. 

Data from CYGNSS provides critical data, as one of many factors, that influence the dynamic environment inside large storms over the ocean.