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Radar Warning Receiver - traduction vers Anglais
.jpg?width=200 "Coherer from 1904 as developed by Marconi.")
![[[Guglielmo Marconi]], who built the first radio receivers, with his early spark transmitter ''(right)'' and coherer receiver ''(left)'' from the 1890s. The receiver records the Morse code on paper tape](https://commons.wikimedia.org/wiki/Special:FilePath/Guglielmo Marconi 1901 wireless signal.jpg?width=200 "[[Guglielmo Marconi]], who built the first radio receivers, with his early spark transmitter ''(right)'' and coherer receiver ''(left)'' from the 1890s. The receiver records the Morse code on paper tape")
.jpg?width=200 "chapter-url=https://books.google.com/books?id=PzzLAwAAQBAJ&pg=PA89}}</ref>")
![A modern [[communications receiver]], used in [[two-way radio]] communication stations to talk with remote locations by [[shortwave radio]].](https://commons.wikimedia.org/wiki/Special:FilePath/Icom IC-R7000 radio receiver.jpg?width=200 "A modern [[communications receiver]], used in [[two-way radio]] communication stations to talk with remote locations by [[shortwave radio]].")
![A galena cat's whisker detector from a 1920s [[crystal radio]]](https://commons.wikimedia.org/wiki/Special:FilePath/Kristallradio (3).jpg?width=200 "A galena cat's whisker detector from a 1920s [[crystal radio]]")
![A bedside [[clock radio]] that combines a radio receiver with an [[alarm clock]]](https://commons.wikimedia.org/wiki/Special:FilePath/Radio-with-Alarm clock.jpg?width=200 "A bedside [[clock radio]] that combines a radio receiver with an [[alarm clock]]")
![Example of transatlantic radiotelegraph message recorded on paper tape by a [[siphon recorder]] at RCA's New York receiving center in 1920. The translation of the Morse code is given below the tape.](https://commons.wikimedia.org/wiki/Special:FilePath/Radiotelegraph syphon recorder tape 1922.png?width=200 "Example of transatlantic radiotelegraph message recorded on paper tape by a [[siphon recorder]] at RCA's New York receiving center in 1920. The translation of the Morse code is given below the tape.")
![selectivity]] to reject stations on adjacent frequencies, multiple cascaded bandpass filter stages had to be used. The dotted line indicates that the bandpass filters must be tuned together.](https://commons.wikimedia.org/wiki/Special:FilePath/Tuned radio frequency (TRF) receiver block diagram 2.svg?width=200 "selectivity]] to reject stations on adjacent frequencies, multiple cascaded bandpass filter stages had to be used. The dotted line indicates that the bandpass filters must be tuned together.")
![During the "[[Golden Age of Radio]]" (1920 to 1950), families gathered to listen to the home radio in the evening, such as this Zenith console model 12-S-568 from 1938, a 12-tube superheterodyne with pushbutton tuning and 12-inch cone speaker.](https://commons.wikimedia.org/wiki/Special:FilePath/Vintage Zenith Console Radio, Model 12S-568, With the Zenith Robot (or Shutter) Dial, Circa 1941 (8655513293).jpg?width=200 "During the \"[[Golden Age of Radio]]\" (1920 to 1950), families gathered to listen to the home radio in the evening, such as this Zenith console model 12-S-568 from 1938, a 12-tube superheterodyne with pushbutton tuning and 12-inch cone speaker.")
.jpg?width=200 "A Zenith transistor based portable radio receiver")
Wikipédia
Radar warning receiver (RWR) systems detect the radio emissions of radar systems. Their primary purpose is to issue a warning when a radar signal that might be a threat is detected, like a fighter aircraft's fire control radar. The warning can then be used, manually or automatically, to evade the detected threat. RWR systems can be installed in all kind of airborne, sea-based, and ground-based assets such as aircraft, ships, automobiles, military bases. This article is focused mainly on airborne military RWR systems; for commercial police speed detection radar RWR systems, see radar detector.
Depending on the market the RWR system is designed for, it can be as simple as detecting the presence of energy in a specific radar band, such as the frequencies of known surface-to-air missile systems. Modern RWR systems are often capable of classifying the source of the radar by the signal's strength, phase and signal details. The information about the signal's strength and waveform can then be used to estimate the type of threat the detected radar poses.
