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Longman Dictionary of Contemporary English
a radio/electrical/radar signal
▪ A transmitter connected to the door bell sends radio signals to a portable receiver.
radar gun
radar trap
▪ In recent years a powerful new radar technique for determining the shapes of NEAs has become available.
▪ The need to use range-Doppler methods is obviated where radar equipment is carried near to a planet by means of a spacecraft.
▪ The single-engine Socata vanished from radar screens after taking off for Mull from Blackpool on Saturday.
▪ Without this information, the controllers only see a radar screen with signals that indicate planes.
▪ The weatherman's just lost it off the long-range radar screen.
▪ The aircraft had begun its descent to Houston Intercontinental Airport when it disappeared from radar screens.
▪ The pilot said he was changing direction - and vanished off radar screens.
▪ Our spirits surged when senior forecaster Llyle Barker pointed at a radar screen.
▪ So you figure that he either hit his approaches stiff - or off the radar screen.
▪ Some scholars say it will be regarded as only the slightest of blips on the radar screen of history.
▪ Similarly, how does a moth perceive the ultrasonic acoustic radar signals of a bat?
▪ Nor are the skies above frequented by commercial airlines, which eliminates interfering radar signals.
▪ But do they see the radar signals, too?
▪ A transponder is a device that emits radar signals identifying and locating aircraft for air traffic controllers.
▪ Rough seas reflect radar signals, producing false echoes which can blind an old radar such as the Type 992.
▪ Clustering applications would include things like character recognition, sonar / radar signal classification, and robotic control.
▪ First of all the radar signal was received and retransmitted by the Viking Lander sitting on the Martian surface.
▪ We can think of radar signals as a series of pulses, but each pulse has a so-called carrier frequency.
▪ Probably due to the confusion no one thought of asking the radar station at Opana in which direction the enemy aircraft headed.
▪ They knew that the story of the radar station at Rudow was a blind.
▪ He had keyed up all the radar stations and they would be alerted the moment anything significant was plotted.
▪ They provide vital back-up service for EF1-11s used to disable the enemy's early warning radar systems.
▪ Of 15 new Arleigh Burker destroyers with Aegis radar systems, about half will be built at Bath.
▪ A Northrop GrummanHughes combination would control the great bulk of the market for airborne radar systems.
▪ RaytheonHughes would dominate the markets in air-to-air and air-to-ground missiles, as well as ground radar systems.
▪ A malfunctioning transponder would leave dots on the radar tape, not a streak, according to the manual, Schulze said.
▪ And the beam can't be spotted by drivers who use radar trap detectors.
▪ At some radar traps, nearly 80 percent of speeding tickets went to out-of-state drivers.
▪ I was pinched for dangerous driving last month, in a radar trap.
▪ The aircraft had begun its descent to Houston Intercontinental Airport when it disappeared from radar screens.
▪ Your game is disappearing from the radar screen of national interest at an alarming rate.
▪ And they believe it made course corrections that no autopilot could make before it disappeared from radar.
▪ The Doppler Effect is used in police radar speed-traps for motorists.
▪ The station will keep operating using two tracking radar dishes and a 40-foot-diameter telemetry antenna dish.
▪ We were trained in nightfighter techniques, using airborne radar.
▪ The small forward sinks 3-pointers as if using radar.
▪ Read in studio Archaeologists are using radar to survey a city's historical past.
▪ Radar mapping is carried out by using a very powerful radar transmitter to send bursts of radar power at the target.
▪ Harris, who was driving a Peugeot 309, was caught by police using a radar gun.
▪ The first would use the same radar and missiles, but would replace the interceptor with a nuclear bomb.
▪ Enemy radar must have detected our approach.
▪ And the overlap could be especially acute in this deal, because both companies are major producers of missiles and radar.
▪ Nor are the skies above frequented by commercial airlines, which eliminates interfering radar signals.
▪ Rough seas reflect radar signals, producing false echoes which can blind an old radar such as the Type 992.
▪ The aircraft had begun its descent to Houston Intercontinental Airport when it disappeared from radar screens.
▪ The idea behind radar was to send out radio waves and listen for echoes from enemy craft.
▪ The same radar data that permit determination of the rotation speed of Venus also permit us to prepare maps of its surface.
▪ Then, the race was for radar.
Douglas Harper's Etymology Dictionary

"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 (disambiguation)

Radar is an acronym for RAdio Detection And Ranging.

Radar may also refer to:

Radar (song)

"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)

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 (audio recorder)

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.

Usage examples of "radar".

Other officers were standing by radar and radar altimeter, NST transceiver, drift indicator, accelerometer, and all the rest of it.

Their aircraft, milling about north of Chiang Mai, stood out clearly on radar, and his scouts had reported Thai airmobile forces gathering several kilometers to the southeast.

A number of enemy radar tracks converge there, and we believe it may be a helicopter staging area for a airmobile assault, almost certainly.

McGinty: patrolling slowly back and forth across the straits until noon, performing the duties just described, then after lunch anchoring in a quiet little cove on the Shikoku side for the afternoon, watching the strait visually and by radar, and communicating with any passing ships by radio or twenty-four-inch signal light.

Commander Arris heard the clear jangle of the radar net alarm as he was dreaming about a fish.

But Jordan and other engineers at Stanford believed that the device might have a few practical applications and before long it became clear how stunningly correct they were - the audion was the first electronic vacuum tube, and its descendants ultimately made possible radio, television, radar, medical monitors, navigation systems and computers themselves.

The best parts of the new avionics and radar are designed to handle sea-skimmers.

For another thirty minutes the bogies appeared hesitantly and indecisively on radar and then the scopes were clear.

The sun had hardly set on the twenty-sixth of November before the bogies began to appear around the edges of the scopes, many more of them than the radar operators remembered having seen before.

D-Day minus 3, and flight operations began with a launch of twelve Reapers led by Bud Schumann, in the full dark at quarter past four, while the last bogies were still fading from the force radars.

Cummins could not ignore the internal radar, that intuition which he and Kehoe, who was a Kilkenny bogman, along with other police had.

When the Kate was blazing on the surface, the second TBF, holding both Colgan and the circler on his radar, gave him a heading back to the first where the flight rejoined and continued home, having moved not one mile off its intended track.

It was no longer visible, not just because of the jettisoning of the rocket motor but because it was cruising below the radar grass, maybe only forty feet above the water.

The idea was to build a satellite capable of detailing the exact locations and technical parameters of every Soviet air defense radar system.

In the South China Sea at 0338 February 19, Dykers made a radar contact on an enemy convoy of five tankers and three escorts.