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Noun. 1. Doppler radar-radar that uses the Doppler shift to measure velocity. microwave radar, radar, radio detection and ranging, radiolocation-measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects. 1  Facebook. 2  Twitter.
His discovery in 1842 was dubbed the Doppler Principle, the concept defining how radar determines speed. Of course there were no radars in that time, but his principles created the foundation for radar development many years later. The First Radar Built By the 1930s, scientists had noticed when ships passed between radio transmitters some of the signal reflected back to the source.