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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 spectroscopy is an indirect method for finding extrasolar planets and brown dwarfs from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star. 582 extrasolar planets were discovered using Doppler spectroscopy, as of April 2016.