The term radar has since entered English and other languages as a common noun, losing all capitalization. The term RADAR was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution.
Radar was developed secretly for military use by several countries in the period before and during World War II. Radio waves (pulsed or continuous) from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the object(s).
It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. Radar ( radio detection and ranging) is a detection system that uses radio waves to determine the distance ( ranging), angle, and radial velocity of objects relative to the site. It rotates steadily, sweeping the airspace with a narrow beam. Radar of the type used for detection of aircraft.
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