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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 differs from aerial photography as an aerial remote sensor. Unlike photography, which is a passive sensor system using the natural reflection from the sun, radar is an active sensor that produces its own illumination. Radar illuminates the terrain and then receives and arranges these reflective signals into an image that can be evaluated.