Answer:
Radar is an acronym for RAdio Detection and Ranging. It uses RF (Radio Frequencies) to detect and range a so called "Target". It is an active sensor which mean that it emits power (RF waves) which bounces off a target and are detected when the wave is received. The time delay between transmission and detection produces range given that the RF wave propagates at a uniform speed.
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First answer by Aero292. Last edit by Ruddorthner. Contributor trust: 14 [recommend contributor recommended]. Question popularity: 3 [recommend question].

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