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Radar warning receiver
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{{Short description|Warns of radar signals that might be a threat}} {{about|airborne military systems|the motoring application|Radar detector}} {{more citations needed|date=July 2011}} [[File:Rafale-5.jpg|thumb|The top end of the aircraft's vertical stabilizer contains a Radar warning receiver, part of the French [[Dassault Rafale]]'s SPECTRA self defense system]] '''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]], [[ship]]s, [[automobile]]s, [[military base]]s. 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.
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