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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.
The strength and origin of echoes received from objects that were hit by the microwaves is then recorded. Because radar senses electromagnetic waves that are a reflection of an active transmission, radar is considered an active remote sensing system.