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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.
The Doppler effect is a shift in the frequency or wavelength of radiation emitted from an object as it moves with respect to an observer. It's named after Austrian physicist Christian Doppler who first proposed it in 1842.