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radar
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Learn how a radar works
Diagram illustrating radar operation, showing a radar antenna sending out a pulse that passes a target airplane; part of the energy is reflected back as an echo pulse toward the antenna. pulse waveform transmitted by radar parts of a radar system radar antennas ASR-9 airport surveillance radar AN/APG-66 radar in an F-16 fighter aircraft refraction of HF radar radiation by the ionosphere hook echo Waveguide
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Air traffic controllers aboard the USS Essex monitoring radar screens, 2003.
radar summary
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Yellow transportation sign with ASAP (as soon as possible) on violet color sky background. (acronyms)
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Armed Forces Radio Services broadcaster Jack Brown interviews Humphrey Bogart and Lauren Bacall for broadcast to troops overseas during World War II.
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radar

electronics
Written by
Merrill I. Skolnik
Superintendent, Radar Division, Naval Research Laboratory, Office of Naval Research, U.S. Department of the Navy, Washington, D.C. Author of Introduction to Radar Systems; editor of Radar Handbook.
Merrill I. Skolnik
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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radar, electromagnetic sensor used for detecting, locating, tracking, and recognizing objects of various kinds at considerable distances. It operates by transmitting electromagnetic energy toward objects, commonly referred to as targets, and observing the echoes returned from them. The targets may be aircraft, ships, spacecraft, automotive vehicles, and astronomical bodies, or even birds, insects, and rain. Besides determining the presence, location, and velocity of such objects, radar can sometimes obtain their size and shape as well....

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