Radar
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Radar
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(From radio detection and ranging).
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1. A method, system, or technique of using beamed, reflected, and timed
radio waves for detecting, locating, or tracking
objects (such as rockets), for measuring altitude, etc., in any of various
activities, such as air traffic control or guidance.
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2. The electronic equipment or apparatus used to generate, transmit, receive,
and, usually, to display radio scanning or locating waves; a radar set.
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The terms primary radar and secondary radar may be used when the return
signals are, respectively, by reflection and by the transmission of a second
signal as a result of triggering responder beacon by the incident signal.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use