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Rada r

Rada r

Serious developmental work on radar began in the s, but the basic idea of radar had its origins in the classical experiments on electromagnetic radiation conducted by German physicist Heinrich Hertz during the late s. Hertz set out to verify experimentally the earlier theoretical work of Scottish physicist James Clerk Maxwell.

Maxwell had formulated the general equations of the electromagnetic fielddetermining that both light and radio waves are examples of electromagnetic waves governed by the same fundamental laws but having widely different frequencies. Hertz demonstrated these properties inusing radio waves at a wavelength of 66 cm which corresponds to a frequency of about MHz.

There was simply no economic, societal, or military need for radar until the early s, when long-range military bombers capable of carrying large payloads were developed. This prompted the major countries of the world to look for a means with which to detect the approach of hostile aircraft.

Most of the countries that developed radar prior to World War II first experimented with other methods of aircraft detection. These included listening for the acoustic noise of aircraft engines and detecting the electrical noise from their ignition.

Researchers also experimented with infrared sensors. None of these, however, proved effective. During the s, efforts to use radio echoes for aircraft detection were initiated independently and almost simultaneously in eight countries that were concerned with the prevailing military situation and that already had practical experience with radio technology. The United StatesGreat Britain, Germany, Francethe Soviet Union, Italythe Netherlands, and Japan all began experimenting with radar within about two years of one another and embarked, with varying degrees of motivation and success, on its development for military purposes.

Several of these countries had some form of operational radar equipment in military service at the start of World War II. The first observation of the radar effect at the U. NRL researchers positioned a radio transmitter on one shore of the Potomac River and a receiver on the other. A ship sailing on the river unexpectedly caused fluctuations in the intensity of the received signals when it passed between the transmitter and receiver.

Today such a configuration would be called bistatic radar. In spite of the promising results of this experiment, U. Navy officials were unwilling to sponsor further work. Hyland observed that an aircraft flying through the beam of a transmitting antenna caused a fluctuation in the received signal. Although Hyland and his associates at NRL were enthusiastic about the prospect of detecting targets by radio means and were eager to pursue its development in earnest, little interest was shown by higher authorities in the navy.

Not until it was learned how to use a single antenna for both transmitting and receiving now termed monostatic radar was the value of radar for detecting and tracking aircraft and ships fully recognized.

The first radars developed by the U. It was an SCR, one of six available in Hawaii at the time, that detected the approach of Japanese warplanes toward Pearl Harbornear Honolulu, on December 7, ; however, the significance of the radar observations was not appreciated until bombs began to fall.

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rada r

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rada r

Get to know our students. Support us.Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraftshipsspacecraftguided missilesmotor vehiclesweather formationsand terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antennaa receiving antenna often the same antenna is used for transmitting and receiving and a receiver and processor to determine properties of the object s.

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. Radar was developed secretly for military use by several nations in the period before and during World War II. A key development was the cavity magnetron in the United Kingdomwhich allowed the creation of relatively small systems with sub-meter resolution. High tech radar systems are associated with digital signal processingmachine 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. With the emergence of driverless vehicles, radar is expected to assist the automated platform to monitor its environment, thus preventing unwanted incidents.

As early asGerman physicist Heinrich Hertz showed that radio waves could be reflected from solid objects. InAlexander Popova physics instructor at the Imperial Russian Navy school in Kronstadtdeveloped an apparatus using a coherer tube for detecting distant lightning strikes. The next year, he added a spark-gap transmitter. Inwhile testing this equipment for communicating between two ships in the Baltic Seahe took note of an interference beat caused by the passage of a third vessel.

In his report, Popov wrote that this phenomenon might be used for detecting objects, but he did nothing more with this observation. Inhe demonstrated the feasibility of detecting a ship in dense fog, but not its distance from the transmitter.

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He also obtained a British patent on September 23, [8] [ dead link ] for a full radar system, that he called a telemobiloscope. His system already used the classic antenna setup of horn antenna with parabolic reflector and was presented to German military officials in practical tests in Cologne and Rotterdam harbour but was rejected.

InRobert Watson-Watt used radio technology to provide advance warning to airmen [10] and during the s went on to lead the U.

Through his lightning experiments, Watson-Watt became an expert on the use of radio direction finding before turning his inquiry to shortwave transmission. Requiring a suitable receiver for such studies, he told the "new boy" Arnold Frederic Wilkins to conduct an extensive review of available shortwave units. Wilkins would select a General Post Office model after noting its manual's description of a "fading" effect the common term for interference at the time when aircraft flew overhead.

Across the Atlantic inafter placing a transmitter and receiver on opposite sides of the Potomac RiverU. Navy researchers A. Hoyt Taylor and Leo C. Young discovered that ships passing through the beam path caused the received signal to fade in and out. Taylor submitted a report, suggesting that this phenomenon might be used to detect the presence of ships in low visibility, but the Navy did not immediately continue the work.

Eight years later, Lawrence A.Related to radar: sonarlidar. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency radio waves reflected from their surfaces.

All rights reserved. Electronics a method for detecting the position and velocity of a distant object, such as an aircraft.

rada r

A narrow beam of extremely high-frequency radio pulses is transmitted and reflected by the object back to the transmitter, the signal being displayed on a radarscope. The direction of the reflected beam and the time between transmission and reception of a pulse determine the position of the object.

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Former name: radiolocation. Copyright, by Random House, Inc. A method of detecting distant objects and determining their position, speed, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps. Dictionary of Military and Associated Terms. US Department of Defense Copyright The Gale Group, Inc.

Switch to new thesaurus. Doppler radar - radar that uses the Doppler shift to measure velocity. Based on WordNet 3. Mentioned in? References in periodicals archive? A range of automotive sensing technologies appear to be inferior to automotive radar technology when it comes to delivering top notch efficiency and up-to-the-mark functionality in extreme weather conditions and challenging road infrastructure.

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Willis Towers Watson has released an updated version of its Radar pricing software. Less often discussed--or warned about--are the radar gaps, the places where there is only a partial picture. Mind The Gaps: No matter how well-equipped our cockpit is, ground-based radar's limitations means we may not see everything. The development of the active electronically scanned array AESA radar is part of the government-led KF-X project under which the country aims to build fighter jets by investing 8.

Preliminary design for KF-X radar completed. Cambridge Pixel, a supplier of radar display, tracking and recording sub-systems, has introduced a 1U 19" rack-mount dual channel radar signal converter, the company said.

Cambridge Pixel releases rack-mount dual channel radar signal converter.There should be a retrievable record of exactly when the Airbus disappeared from radar. The radar stations would be used to guide interceptors to their targets while the training range would be used to train pilots. A tropical storm, clearly visible on radar for days, is to blame.

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Rubbing his knuckles and feeling better than he had felt for days, he started back to the radar bridge. The speakers about the radar room murmured the orders given through all the ship. I got a thousand just for picking up that ship on the radar. Roger's voice blasted through the intercom from the radar deck.

A method of finding the position and velocity of an object by bouncing a radio wave off it and analyzing the reflected wave. Radar is an acronym for ra dio d etection a nd r anging. Find out with this quiz on words that originate from American Indigenous languages. Origin of radar —45, Americanism ; ra dio d etecting a nd r anging.

Words nearby radar racquetracquetballracyradRADAradarradar astronomyradar beaconradar gunradarkymographyradarman. Words related to radar sonardirection findingtracking system.

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Example sentences from the Web for radar There should be a retrievable record of exactly when the Airbus disappeared from radar. Good Luck With That. Stand by for Mars!

Carey Rockwell. Danger in Deep Space Carey Rockwell. The Aliens Murray Leinster. The Space Pioneers Carey Rockwell. The direction of the reflected beam and the time between transmission and reception of a pulse determine the position of the object Former name: radiolocation. Word Origin for radar C20 ra dio d etecting a nd r anging. A method of detecting distant objects and determining their position, speed, material composition, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves.

The waves can be converted into images, as for use on weather maps. The equipment used in such detecting. See also Doppler effect lidar sonar. All rights reserved. Write Better With Synonym Swaps! Try Now.Draw odds dropping 0. Always carry your Attitude Confidence Enthusiasm. Retweet this tweet before midday (GMT) on Sunday 10th December and I'll send them to a lucky-dipped winner.

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