Radar warning receiver

RWRradar warning receiversradar warningdetectAN/ALR-93 radar warning receiversbackwards warning devicepassive warning receiverradarradar warning receiver (RWR)radar warning receivers (RWR)
Radar warning receiver (RWR) systems detect the radio emissions of radar systems.wikipedia
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Pulse repetition frequency

PRFpulse repetition frequenciesmedium pulse repetition frequency
The receiver periodically scans across the frequency band and determines various parameters of the received signals, like frequency, signal shape, direction of arrival, pulse repetition frequency, etc. By using these measurements, the signals are first deinterleaved to sort the mixture of incoming signals by emitter type.
Radar warning receivers in aircraft include a library of common PRFs which can identify not only the type of radar, but in some cases the mode of operation.

AN/ALR-2002

ALR-2002 (Australia; developmental, project being cancelled)
The AN/ALR-2002 Radar Warning Receiver is designed to warn an aircraft's crew of potentially hostile radar activity.

AN/ALR-67 Radar Warning Receiver

ALR-67(V)3AN/ALR-67ALR-69A RWR
AN/ALR-67 (USA; AV-8B Harrier II, F-14 Tomcat, F/A-18 Hornet, F/A-18E/F Super Hornet, EA-6B Prowler, Canada; CF-18 Hornet)
The AN/ALR-67 Radar Warning Receiver is designed to warn an aircraft's crew of potentially hostile radar activity.

McDonnell Douglas F-4 Phantom II

F-4F-4 Phantom IIF-4 Phantom
AN/ALR-46 (USA; F-4 Phantom II, RF-4 Phantom II, F-5, B-52G) AN/ALR-69 (USA; B-52H Stratofortress, lacks Frequency Selective Receiver (FSRS) capabilities however, A-10 Thunderbolt II, AC-130 Spectre, F-16 Fighting Falcon, HH-53, MC-130, F-4E Phantom II).
Like other Vietnam War Phantoms, the F-4Ds were urgently fitted with radar warning receivers to detect the Soviet-built S-75 Dvina SAMs.

Northrop F-5

F-5F-5ENorthrop F-5E Tiger II
AN/ALR-46 (USA; F-4 Phantom II, RF-4 Phantom II, F-5, B-52G)
The modernization centered on several areas: new electronic warfare systems, the Grifo F radar, an air-to-air refueling system, INS/GPS-based navigation, support for new weapons, targeting and self-defense systems, HOTAS, LCD displays, helmet-mounted displays (HMDs), Radar Warning Receiver, encrypted communications, cockpit compatibility for night vision goggles, On-Board Oxygen Generation System (OBOGS) and various new onboard computer upgrades.

McDonnell Douglas F-15 Eagle

F-15F-15 EagleF-15s
AN/ALR-56 (USA; F-15 Eagle, F-16 block 50 and 52, Canada; CC-130 Hercules)
The F-15's electronic warfare system provides both threat warning (radar warning receiver) and automatic countermeasures against selected threats.

Ground-controlled interception

GCIground control interceptground controlled interception
As long as the pilot is careful to check for aircraft that might try to sneak up without radar, say with the assistance of AWACS or GCI, it should be able to steer clear of SAMs, fighter aircraft and high altitude, radar-directed AAA.
Typically, to perform an interception by themselves beyond visual range, the aircraft would have to search the sky for intruders with their radars, the energy from which might be noticed by the intruder's radar warning receiver (RWR) electronics, thus alerting the intruders that they may be coming under attack.

Radar lock-on

lock-onmissile lock-onmissile lock
The pilot then can take evasive action to break the missile lock-on or dodge the missile.
This led to the introduction of radar warning receivers that would notice this change and provide a warning to the operator.

Grumman F-14 Tomcat

F-14 TomcatF-14F-14A Tomcat
AN/ALR-67 (USA; AV-8B Harrier II, F-14 Tomcat, F/A-18 Hornet, F/A-18E/F Super Hornet, EA-6B Prowler, Canada; CF-18 Hornet)
The F-14 also features electronic countermeasures (ECM) and radar warning receiver (RWR) systems, chaff/flare dispensers, fighter-to-fighter data link, and a precise inertial navigation system.

Boeing F/A-18E/F Super Hornet

F/A-18E Super HornetF/A-18F Super HornetF/A-18E/F Super Hornet
AN/ALR-67 (USA; AV-8B Harrier II, F-14 Tomcat, F/A-18 Hornet, F/A-18E/F Super Hornet, EA-6B Prowler, Canada; CF-18 Hornet)
The defensive countermeasures of Block I aircraft includes the AN/ALR-67(V)3 radar warning receiver, the AN/ALE-47 countermeasures dispenser, the AN/ALE-50 towed decoy and the AN/ALQ-165 Airborne Self-Protect Jammer (ASPJ).

McDonnell Douglas AV-8B Harrier II

AV-8B Harrier IIAV-8B HarrierAV-8B
AN/ALR-67 (USA; AV-8B Harrier II, F-14 Tomcat, F/A-18 Hornet, F/A-18E/F Super Hornet, EA-6B Prowler, Canada; CF-18 Hornet)
Defensive equipment include several AN/ALE-39 chaff-flare dispensers, an AN/ALR-67 radar warning receiver, and an AN/ALQ-126C jammer pod.

Lockheed Martin F-22 Raptor

F-22 RaptorF-22F-22A Raptor
AN/ALR-94 (USA; F-22)
Key avionics include BAE Systems EI&S AN/ALR-94 radar warning receiver (RWR), Lockheed Martin AN/AAR-56 infrared and ultraviolet Missile Launch Detector (MLD) and Northrop Grumman AN/APG-77 active electronically scanned array (AESA) radar.

Missile approach warning system

MAWMAWSmissile approach warning
Missile approach warning
Radar warning receivers on the other hand already proved their effectiveness by the early 1970s which considerably improved the survival rate of aircraft against radar threats.

Lockheed AC-130

AC-130AC-130 SpectreAC-130U
AN/ALR-69 (USA; B-52H Stratofortress, lacks Frequency Selective Receiver (FSRS) capabilities however, A-10 Thunderbolt II, AC-130 Spectre, F-16 Fighting Falcon, HH-53, MC-130, F-4E Phantom II).
Raytheon AN/ALR-69 – digital Radar warning receiver (RWR)

HAL Tejas

Light Combat AircraftTejasLCA
Tarang (India; MiG-27 Flogger, LCA Tejas, Jaguar, Su-30MKI Flanker)
This EW suite, known as Mayavi, includes a radar warning receiver (RWR), Missile Approach Warning (MAW) and a Laser warning receiver (LWR) system, Infrared & Ultraviolet Missile warning sensors, self-protection jammer, chaff, jaff and flares dispenser, an electronic countermeasures (ECM) suite and a towed radar decoy (TRD).

List of Rainbow Codes

rainbow codeRainbow Codesrainbow codename
List of Rainbow Codes
Yellow Barley - radar warning receiver

Laser warning receiver

laser warning system LWRlaser
Laser warning receiver
* Radar warning receiver

Radio

radio communicationradio communicationswireless
Radar warning receiver (RWR) systems detect the radio emissions of radar systems.

Radar

radar stationradarsradar system
Radar warning receiver (RWR) systems detect the radio emissions of radar systems.

Aircraft

heavier-than-airflying machineheavier-than-air flight
RWR systems can be installed in all kind of airborne, sea-based, and ground-based assets (such as aircraft, ships, automobiles, military bases).

Ship

shipsvesselsvessel
RWR systems can be installed in all kind of airborne, sea-based, and ground-based assets (such as aircraft, ships, automobiles, military bases).

Military base

military installationbasemilitary bases
RWR systems can be installed in all kind of airborne, sea-based, and ground-based assets (such as aircraft, ships, automobiles, military bases).

Radar detector

radar detectorscar radar detectorsspeed detection radar
Their primary purpose is to issue a warning when a radar signal that might be a threat (such as a police speed detection radar or a fighter jet's fire control radar) is detected.

Pulsed power

pulsepulsedAtlas Pulse Power
For more critical situations, such as military combat, RWR systems are often capable of classifying the source of the radar by the signal's strength, phase and waveform type, such as pulsed power wave or continuous wave with amplitude modulation or frequency modulation (chirped).

Continuous wave

CWcontinuous-wavecontinuous-wave operation
For more critical situations, such as military combat, RWR systems are often capable of classifying the source of the radar by the signal's strength, phase and waveform type, such as pulsed power wave or continuous wave with amplitude modulation or frequency modulation (chirped).