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(ËreÉª dÉr) n. 1. a device or system for determining the presence and location of an object by measuring the direction and timing of radio waves. 2. a means of awareness; perception: lobbyists working under the media's radar.
RADAR is an acronym for RAdio Detection And Ranging. Unlike police laser, police radar directly determines a vehicleâs speed by measuring the doppler (speed induced) shift of the return of its transmitted frequency (think of the sound you sometimes hear of an approaching or receding train or emergency vehicle).