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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.
Doppler effect. The Doppler effect is defined as a noticeable change in the frequency of sound, light or water waves as the source and the observer move. An example of the Doppler effect is that the frequency of the sound increases as the source moves closer to the observer.