Radar

Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter.

Radar was secretly developed by several nations before and during World War II. The term RADAR was coined in 1940 by the United States Navy as an acronym for RAdio Detection And Ranging. The term radar has since entered English and other languages as the common noun radar, losing all capitalization.

The modern uses of radar are highly diverse, including air traffic control, radar astronomy, air-defense systems, antimissile systems; marine radars to locate landmarks and other ships; aircraft anticollision systems; ocean surveillance systems, outer space surveillance and rendezvous systems; meteorological precipitation monitoring; altimetry and flight control systems; guided missile target locating systems; and ground-penetrating radar for geological observations. High tech radar systems are associated with digital signal processing and are capable of extracting useful information from very high noise levels.

Other systems similar to radar make use of other parts of the electromagnetic spectrum. One example is "lidar", which uses visible light from lasers rather than radio waves.

Read more about Radar:  History, Applications, Principles, Engineering

Other articles related to "radar, radars":

Flakpanzer Gepard - Variants
... There are two variants of Gepard in service the Dutch has a different radar installation ... Germany Search radar S band, 15 km range Tracking radar Ku band, 15 km range Laser rangefinder Netherlands Search radar X band, 15 km range Tracking radar X/Ka band, 13 km ...
Doppler Effect and Its Applications
... fetal monitor Doppler LIDAR Doppler on Wheels Doppler radar Doppler spectroscopy Doppler weather radar Laser Doppler velocimetry Laser Doppler ...
603rd Air Control Squadron - Mission
... mission of the 603 ACS is to operate a mobile unit capable of providing radar control and surveillance within a designated area, to collect, display, and ... The squadron is further tasked to provide radar control for friendly aircraft in an offensive role against ground targets, and in a defensive mission against airborne threats, as directed ...
Engineering - Radar Coolant
... Coolanol (silicate ester) was used in several military radars in the 1970s ... and deionized water is normally used with most high power surface radar systems that utilize Doppler processing ...
Würzburg Radar
... The Würzburg radar was the primary ground-based gun laying radar for both the Luftwaffe and the German Army during World War II ...

Famous quotes containing the word radar:

    So I begin to understand why my mother’s radar is so sensitive to criticism. She still treads the well-worn ruts of her youth, when her impression of mother was of a woman hard to please, frequently negative, and rarely satisfied with anyone—least of all herself.
    Melinda M. Marshall (20th century)