What is "radar"

"electronic system for locating objects by means of radio waves," 1941, acronym (more or less) from radio detecting and ranging. The U.S. choice, it won out over British radiolocation. Figurative from 1950.

acr. {{abbreviation of| (l en radio '''ra'''dio) (l en detection '''d'''etection) (l en and '''a'''nd) (l en ranging '''r'''anging) |lang= en }}

n. measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects [syn: microwave radar, radio detection and ranging, radiolocation]

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, an emitting antenna, a receiving antenna (separate or the same as the previous one) to capture any returns from objects in the path of the emitted signal, a receiver and processor to determine properties of the object(s).

Radar was secretly developed by several nations in the period 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 a common noun, losing all capitalization.

The modern uses of radar are highly diverse, including air and terrestrial 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, ground-penetrating radar for geological observations, and range-controlled radar for public health surveillance. High tech radar systems are associated with digital signal processing, machine learning 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 ultraviolet, visible, or near infrared light from lasers rather than radio waves.

Radar is an acronym for RAdio Detection And Ranging.

Radar may also refer to:

"Radar" is a song recorded by American singer Britney Spears for her fifth studio album, Blackout (2007). It was written and produced by Bloodshy & Avant and The Clutch, with additional writing from Henrik Jonback, as a record that did not relate to any of her personal problems at the time. The recording sessions took place the day after Spears filed for divorce from Kevin Federline, and members of The Clutch claimed to be surprised by her work ethic. "Radar" was originally planned to be released as the third single from Blackout, but " Break the Ice" was chosen instead. The song was then planned as the fourth single, but the release was cancelled as Spears began recording her sixth studio album, Circus (2008). "Radar" was later included as a bonus track on Circus, and released as the fourth and final single from the album on June 22, 2009 by Jive Records.

Musically, "Radar" is an electropop and synthpop song, that runs through a midtempo dance groove. Spears' vocals are auto tuned and accompanied by sonar pulses and a heavy usage of distorted synthesizers. The lyrics refer to an attraction between the protagonist and a man, while she wonders if he knows what she is feeling. "Radar" received mixed reviews from critics; some called it one of the highlights of Blackout, while others felt that it was over-produced and also criticized her vocals for being processed. In July 2008, "Radar" charted in the top forty of Ireland and New Zealand, and inside the top-ten in Sweden. After it was released as a single from Circus, the track performed poorly on the charts and did not manage to enter the top forty in most countries. However, it became her 21st hit on the US Billboard's Pop Songs chart, the most for any artist of the decade.

The single's accompanying music video was directed by Dave Meyers, and pays tribute to the music video of Madonna's " Take a Bow" (1994). In the video, Spears is an aristocratic woman involved in a love triangle with two men who are polo players. The video received mixed reviews from critics, who complimented the fashion but called the idea unoriginal. "Radar" was performed by Spears at The Circus Starring Britney Spears (2009), with the accompanying dance routine featuring her pole dancing.

Radar Radio (also referred to as Radar Music, colloquially called Radar) was an Australian Digital Radio station. It was run by Southern Cross Austereo from its launch date on 11 December 2008 to the closure of the station Monday 25 November 2013. The Radar Radio website was also taken down on the same day as the station closure.

RADAR (Random Access Digital Audio Recorder) is a product line of professional digital multitrack recorders capable of recording and playing back twenty-four tracks of audio.

Radar(Ejabbabbaje) is an EP by the Italian band Verdena, published with the magazine XL, released in 2011.