Early-warning radar

early warning radarearly warningearly-warningair search radarMicrowave Early Warningair & surface search radarair-search radarearly warning stationearly-warning radarsEWR
An early-warning radar is any radar system used primarily for the long-range detection of its targets, i.e., allowing defences to be alerted as early as possible before the intruder reaches its target, giving the air defences the maximum time in which to operate.wikipedia
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Chain Home

Daventry Experimentearly warning Chain Home radar system
The canonical EW radar is the British Chain Home system, which entered full-time service in 1938.
Chain Home, or CH for short, was the codename for the ring of coastal Early Warning radar stations built by the Royal Air Force (RAF) before and during the Second World War to detect and track aircraft.

Freya radar

FreyaFreya'' radarearly warning radars
The German Freya and US CXAM (Navy) and SCR-270 (Army) were similar.
Freya was an early warning radar deployed by Germany during World War II; it was named after the Norse Goddess Freyja.

SCR-270

SCR-270 radarSCR-271K-22 trailer
The German Freya and US CXAM (Navy) and SCR-270 (Army) were similar.
The SCR-270 (Signal Corps Radio model 270) was one of the first operational early-warning radars.

Over-the-horizon radar

over-the-horizonRezonans NE3over the horizon backscatter radar
Starting in the 1950s, a number of over-the-horizon radars were developed that greatly extended detection ranges, generally by bouncing the signal off the ionosphere.
Several OTH radar systems were deployed starting in the 1950s and 1960s as part of early warning radar systems, but these have generally been replaced by airborne early warning systems.

Ballistic Missile Early Warning System

BMEWSAN/FPS-50AN/FPS-49
A major exception to this rule are radars intended to warn of ballistic missile attacks, like BMEWS, as the high-altitude exo-atmospheric trajectory of these weapons allows them to be seen at great ranges even from ground-based radars.
The RCA 474L Ballistic Missile Early Warning System (BMEWS, "474L System", Project 474L) was a United States Air Force Cold War early warning radar, computer, and communications system, for ballistic missile detection.

Chain Home Low

Chain Home Extra Low (CHEL)/CDChain Home Extra Low Station K164Chain-Home Low
Chain Home Low (CHL) was the name of a British early warning radar system operated by the RAF during World War II.

AMES Type 80

Green GarlicType 80
The AMES Type 80, sometimes known by its development rainbow code Green Garlic, was a powerful early warning (EW) and ground-controlled interception (GCI) radar developed by the Telecommunications Research Establishment (TRE) and built by Decca for the Royal Air Force (RAF).

Duga radar

DugaRussian WoodpeckerSteel Yard
Duga was a Soviet over-the-horizon radar (OTH) system used as part of the Soviet missile defense early-warning radar network.

Airborne early warning and control

AWACSairborne early warningAEW&C
Today the early warning role has been supplanted to a large degree by airborne early warning platforms.
After having developed Chain Home—the first ground-based early-warning radar detection system—in the 1930s, the British developed a radar set that could be carried on an aircraft for what they termed "Air Controlled Interception".

AMES Type 85

Blue RibandBlue RibandBlue Yeoman
The AMES Type 85, also known by its rainbow code Blue Yeoman, was an extremely powerful early warning (EW) and fighter direction (GCI) radar used by the Royal Air Force (RAF) as part of the Linesman/Mediator radar network.

Pinetree Line

Pine Tree LinePinetree AgreementPinetree Radar Line
By 1957, just over a year after the Mid-Canada Line was operational, a more advanced long-range search radar, mainly in the Canadian north and Alaska were deployed comprising the Distant Early Warning Line.

Dnestr radar

DneprDnepr radarDnestr
Dnestr radar and Dnepr radar, both known by the NATO reporting name Hen House are the first generation of Soviet space surveillance and early warning radars.

ROTOR

Anti-Aircraft Operations Roomradar stationROTOR programme
In order to get it operational as quickly as possible, it was initially made up primarily of WWII-era systems, notably the original Chain Home radars for the early warning role, and the AMES Type 7 for plotting and interception control.

Daryal radar

DaryalDaugava radarDaryal-type
The Daryal-type radar (NATO: Pechora) is a Soviet bistatic early-warning radar.

Linesman/Mediator

LinesmanLinesman and MediatorLinesman System
UKADGE was further expanded with Marconi Martello radars to become IUKADGE and the Type 85s stood down in the 1990s.

EL/M-2090

The EL/M-2090 TERRA is an Israeli ground-based very long range early-warning radar system produced by Elta, a subsidiary of Israel Aerospace Industries IAI.

North Warning System

18 Air Force radar sitesCAM-4Cape Dyer-DEW line
The North Warning System (NWS) is a joint United States and Canadian early-warning radar system for the atmospheric air defense of North America.

PAVE PAWS

AN/FPS-115AN/FPS-120AN/FPS-123
PAVE PAWS (Precision Acquisition Vehicle Entry Phased Array Warning System) is an elaborate Cold War early warning radar and computer system developed in 1980 to "detect and characterize a sea-launched ballistic missile attack against the United States".

Sea-based X-band Radar

military purposesSBX-1Sea-based X band Radar
The Sea-Based X-Band Radar (SBX-1) is a floating, self-propelled, mobile active electronically scanned array early-warning radar station designed to operate in high winds and heavy seas.

Voronezh radar

VoronezhVoronezh-DM radar
Voronezh radars are the current generation of Russian early-warning radar, providing long distance monitoring of airspace against ballistic missile attack and aircraft monitoring.

Distant Early Warning Line

DEW LineDistant Early WarningDistant Early Warning (DEW) line
To counter the threat of Soviet bombers flying over the Arctic, the U.S. and Canada developed the DEW Line.

Red Color

Color RedRed DawnRed Dawn Radar System
The Red Color (צבע אדום, transl.: Tzeva Adom) is an early-warning radar system installed by the Israel Defense Forces in several towns surrounding the Gaza Strip to warn civilians of imminent attack by rockets (usually Qassam rockets).

Mid-Canada Line

Mid Canada Line
An alternative early warning design was the Mid-Canada Line, which provided "line breaking" indication across the middle of Canada, with no provision to identify the target's exact location or direction of travel.

Long Range Discrimination Radar

LRDR
LDLR is a Gallium Nitride (GaN)-based, solid-state Active Electronically Scanned Array (AESA) early-warning radar, that allows for continuous coverage, even when it is undergoing maintenance.