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| Type 85 radar | |
|---|---|
| Name | Type 85 radar |
| Country | United Kingdom |
| Introduced | 1960s |
| Manufacturer | Marconi Electronic Systems; English Electric; Ferranti |
| Type | Long-range early warning radar |
| Frequency | S-band |
| Azimuth | 360° |
| Elevation | High-angle coverage |
| Power | Megawatt-class peak |
Type 85 radar was a British long-range early warning and ground-controlled interception radar developed during the Cold War for airspace surveillance and strategic warning. Designed in response to perceived vulnerabilities highlighted by the Berlin Crisis (1961), Cuban Missile Crisis, and evolving Soviet bomber capabilities, the system sought to provide continuous detection of high-altitude threats across the United Kingdom and North Atlantic approaches. Development drew on expertise from companies such as Marconi Company, English Electric, and Ferranti, and interfaced with networks including Royal Air Force air defence sectors and NATO command structures.
Conceived amid debates within the Ministry of Defence and the Royal Air Force over future air defence, the project followed earlier programmes like the Chain Home and ROTOR upgrades and was influenced by studies from the Royal Aircraft Establishment. Contractors including Marconi Electronic Systems and English Electric advanced array and transmitter design, combining rotating antenna concepts from Type 80 radar developments with pulse-compression techniques trialled at the Wickham Market test sites. Political drivers included commitments under the North Atlantic Treaty Organization and procurement guidance from the Defence Research Policy Committee (UK); industrial coordination involved firms such as Standard Telephones and Cables and AEI (Associated Electrical Industries). The architecture incorporated electronic counter-countermeasures (ECCM) research informed by incidents reviewed in Exercise Mainbrace and analyses by the Advisory Committee on the Electronics Industry.
The instrument employed an S‑band rotating phased-array antenna with peak power in the megawatt range, pulse-compression and coherent processing derived from work at the Royal Radar Establishment, and a receiver chain featuring superheterodyne components sourced from Marconi workshops. Beam steering and height-finding used monopulse techniques pioneered at the Radar Research Laboratory, while signal processing relied on analogue-to-digital converters influenced by developments at Plessey and Ferranti. System redundancy and data links conformed to standards compatible with Linesman interfaces and NATO Tactical Data Link considerations, enabling feed into command centres at stations such as RAF Bawdsey and RAF Neatishead. Environmental hardening referenced civil engineering guidelines from the Ministry of Defence Works Directorate.
Commissioned into service in the late 1960s, the radar formed part of the United Kingdom’s strategic surveillance posture during crises including heightened alert periods in the Cold War and NATO exercises like Exercise Sky Shield. It provided long-range detection that fed interceptor vectors to squadrons operating English Electric Lightning and later Panavia Tornado aircraft, and interacted with surface-to-air assets whose doctrines evolved from lessons at events such as Operation Skyshield. Maintenance and logistical support cycles involved depots at facilities run by Royal Ordnance and contractor support from Marconi. The system remained active through shifts in defence policy following reports by the Defence White Paper (1966), and some installations were realigned in response to the strategic reorientation after the détente period.
Over its service life, the platform underwent iterative upgrades including enhancements to signal processing courtesy of collaborations with Plessey, ECCM suites inspired by NATO research panels, and integration with digital command networks influenced by early NATO Air Command and Control System concepts. Proposed variants included coastal warning adaptations reflecting use cases studied at Admiralty coastal defence boards and mobile configurations trialled with support from the Army Air Corps logistics branches. Upgrade programmes paralleled developments in allied systems such as the AN/FPS-24 and Soviet P-12 (Spoon Rest), prompting reciprocal improvements in clutter rejection and moving-target indication.
Primary operator was the Royal Air Force under the auspices of RAF Fighter Command and later Air Defence of Great Britain structures, with sites distributed across Scotland, England, and Northern Ireland to cover North Atlantic and polar routes observed during reconnaissance missions by Soviet Long Range Aviation. NATO coordination linked data streams to command posts at Supreme Headquarters Allied Powers Europe and the Allied Command Europe Mobile Force. Industrial partners included Marconi, Ferranti, Plessey, and English Electric for manufacture, fielding, and sustainment.
In service, the radar achieved long-range detection of high-altitude targets and proved resilient to certain jamming techniques through ECCM additions informed by NATO Electronic Warfare research; however, performance degraded against low-level, terrain-masked targets similar to challenges documented with ROTOR-era systems. Limitations included large radar cross-section requirements, vulnerability of fixed sites to attack as discussed in reviews following the 1966 Defence White Paper, and maintenance burdens associated with high-power transmitters comparable to those in systems like the AN/FPS-20. The system’s ability to discriminate very low-observable or sea-clutter-embedded contacts was constrained until later digital upgrades were implemented.
The Type 85 programme influenced subsequent UK radar projects and procurement policy, feeding technical lessons into successors such as Type 102 radar initiatives and contributing engineering knowledge to companies that later worked on Type 93 and other NATO interoperable sensors. Doctrinally, its integration with Linesman-era command systems shaped concepts later adopted in the modernisation efforts that culminated in the UK Air Surveillance and Control System. The project’s industrial collaborations helped sustain the British radar sector through corporate evolutions involving GEC and British Aerospace, and its technical heritage is reflected in research at institutions like the Royal Radar Establishment and Royal Aircraft Establishment.
Category:Cold War radars Category:Royal Air Force radar systems