Rapier SAM system The original Rapier took the form of a two-wheeled launcher carrying four missiles, an optical tracker unit, a generator, and a trailer of reserve missiles. The launcher consists of a vertical cylindrical unit carrying two missiles on each side, the surveillance radar dish and "
Identification Friend or Foe" (IFF) system under a radome on top, the guidance computer and radar electronics at the bottom, and a prominent parabolic antenna for sending guidance commands to the missiles on the front. The search radar, of the pulsed Doppler type, has a range of about . The aerial, located at the top of the launcher, rotates about once a second, looking for moving targets through their
Doppler shift. Upon detecting a target, a lamp lights up on the Selector Engagement Zone (SEZ) — a box containing 32 orange lamps arranged in a circle about the size of an automobile steering wheel. The radar operator can use switches to blank out returns from other directions, providing jamming resistance. The optical tracker unit comprises a stationary lower section housing the operator controls and a rotating upper section containing the tracking optics. The operator's optical system is a modified telescope containing a
Dove prism to prevent the image 'toppling' as the optics rotate in azimuth. Using this system means that, unlike a
periscope, the operator does not have to move to track the target. The upper section also contains a separate missile tracking system that follows the operator's optics, based on a television camera optimized for the IR band. Upon detection of a target, the optical tracking system is slewed to target the azimuth supplied by the SEZ; the operator then searches for the target in elevation. The operator's field of view is selected based on the target's range: "wide" at about 20 degrees or "track" at about 4.8 degrees. When the target is found, the operator switches to "track" and uses a joystick to keep the target centred in the telescope. Once a steady track is established, the missile is fired. The TV camera on the tracker is tuned to track four flares on the missile's tail. Like the operator's telescope, the TV system has two views: about 11 degrees wide for the initial "capture", and 0.55 degrees for mid-course tracking. The location of the missile relative to the line of sight is measured using a system identical to the "chopper" system used in early
infrared homing missiles. The chopper is inside the launcher, rather than on the missile, and feeds an image from the tracking camera which passes through the light from the flares. The chopper generates signals that encode the angle of the missile relative to "up" and the angle out from the centre, or "error off". The simple computer in the base then calculates the control inputs needed to bring the missile into the line of sight and sends them to the missile via the transmitter on the launcher platform, to the small receiver antennas on the rear of the mid-body fins. The operator simply keeps the telescope's crosshairs on the target using the joystick, and the missile automatically flies into the line of sight. The basic concept is similar to that used by most
anti-tank missiles, except that those normally use small wires — rather than a radio link — to send guidance information to the missile. The missile contains a warhead with a
contact fuze and a single-stage solid-rocket motor that accelerates the missile to about , about Mach 2. Engagement time to the maximum effective range is about 13 seconds. Response time from initial target detection to missile launch is about six seconds, repeatedly confirmed in live firing. The whole system and its crew are delivered by two
Land Rovers designated the
Fire Unit Truck (FUT) and the
Detachment Support Vehicle (DSV). Royal Artillery batteries comprised three troops each of four fire units, while RAF Regiment squadrons had eight fire units. By 1980, each Royal Artillery fire unit consisted of a 24-volt,
101 FC 1 tonne Land Rover towing the Rapier Launcher and carrying four missiles on board, a , 3/4 ton, 24 V FFR (Fitted For Radio) Land Rover towing a 1-ton Missile Supply Trailer (MST) containing up to 10 further missiles. Blindfire radar (see below) was only provided for a third of fire units in British Army service, but for all fire units in the RAF Regiment.
Blindfire radar, FSA Although accurate and simple to use, the original Rapier system clearly suffered from a lack of all-weather capability. To address this need, BAC started work on a separate radar guidance unit, primarily to improve foreign sales. This led to the introduction of the Marconi DN 181 "Blindfire" radar in 1970, the first examples being sold to the Iranian Army in 1973. The British Army did not purchase the Blindfire system until 1979, entering service with Rapier "Field Standard A" (FSA). The RAF Regiment had 27 Squadron operational with Blindfire at RAF Leuchars by 1979, and was in the process of bringing all the RAF Regiment GBAD (Ground Based Air Defence) Squadrons into line. By 1997 more than 350 Blindfire radars had been produced. To ensure accuracy, Blindfire uses a very narrow "pencil" beam and tracks both the target and missile. To allow the operator to monitor the Blindfire system when it tracks the target, the existing optical tracker follows the Blindfire radar, although it is possible for the optical tracker to be manually "laid on" a second target whilst the Blindfire engages the first. The Blindfire trailer carries its own generator unit, and is towed by a third Land Rover (a 12 V winch-equipped 101 FC) with the designation
Tracking Radar Tractor (TRT).
Tracked Rapier With sales to
Iran came the additional requirement for a fully-mobile version of Rapier to protect the Chieftain tanks being supplied on a UK MOD contract. BAC responded by adapting the Rapier system to fit on the
M548, a cargo-carrier version of the ubiquitous M113. Development started in 1974 as "Tracked Rapier", with the first public showing at the 1977
Paris Air Show as a static display unit. The initial proposal for the system was to simply mount the towed launcher, including its petrol generator set but minus its running gear, on the flatbed of the M548 carrier. When this was shown to Mr. G.R. Jefferson, the GW Managing Director, he was not very impressed. Aware of the amount of money available, he required a much more extensive change. Greville Beale and Adrian Pollicutt led the development of a significantly different arrangement which was produced in a short period. This included significant changes to armour the M548 vehicle, now designated RCM 748, and to incorporate the diesel-powered Coventry Climax H 30 engine to run the new generator set, and also as the auxiliary power unit. The majority of the electronic equipment in the launcher was not changed significantly from the towed version. However, a completely redesigned armoured launcher with the capability of loading eight missiles was produced, mounted via anti-vibration mounts to the flatbed of the vehicle. The armoured cab was provided with pan-climatic heating/cooling and NBC protection. The optical tracker was placed inside the armoured cab of the vehicle, elevating through the roof for operation. The tracker was operated from the right side of the crew cabin, while on the left were the driver and tactical controller who also had a helmet-mounted sight, allowing him to lay the tracker onto a visual target. From moving to firing took only 30 seconds, a tremendous improvement over Towed Rapier, which required at least 15 minutes to unlimber, cable-up and align. A further difference between Towed and Tracked Rapier was that the Tracked Rapier launcher had eight (protected) missile rails compared with four in the towed system, enhancing firepower and reducing re-supply requirements. It was also air-portable, ready to deploy on landing, in
C-130 aircraft. There was no room for Blindfire on a single RCM748 vehicle, so this was instead towed or was to be carried on a separate modified M548/RCM748. Feeding data to the control system in the firing unit again required setup time to connect the two pieces of equipment. The system had not yet been fully developed when the Iranian Shah fell from power in 1978. The vehicles were later purchased by the British Army as part of a Fixed-price Develop and Supply contract. The first production Tracked Rapier was accepted on time and to cost at Wellington Barracks in early 1981, and entered service with
11 (Sphinx) Air Defence Battery, of 22 Air Defence Regiment,
Royal Artillery in 1983 in
Napier Barracks near
Dortmund. After initially entering service at Towed FSB1 standard, with planar array radar and the 'Pointing Stick', the Tracked Rapiers were upgraded, with the latest version included a thermal-imaging enhanced tracker which enabled single vehicle 24-hour operation without the need for the Blindfire unit. A modified M548 Missile Resupply Vehicle carried replacement missiles, a relief crew, and additional field kits, rations and water. A further M548 was configured as a REME Forward Area Support team with test facilities and spares. During the
Gulf War, 12 and 16 Regiment Royal Artillery tracked batteries, quickly fitted with sat-nav for desert use, combined to provide Tracked Rapier support to deployed armoured regiments. Tracked Rapier was retired in the early 1990s, due to manning limitations when the Towed FSC version entered service. It has since been replaced by
Starstreak missile launchers mounted on the
Alvis Stormer.
FSB Shortly after introducing FSA, "Field Standard B" (FSB) added a number of basic upgrades. Additionally, the search radar was upgraded to be easily shut down in case of an
anti-radiation missile attack. FSB included lessons from the Falklands campaign, notable the 'pointing stick' that enabled the detachment commander of a fire unit to point the aiming unit at a target.
Laserfire With the range of upgrades and new components, the original low-cost Rapier system was gone. In order to address international market requirements for a lower-cost system, BAC started development of the "Rapier Laserfire" in 1982. Laserfire replaced the original optical tracker unit with a new
lidar (laser radar) illuminating system that is considerably smaller, allowing the entire system to be mounted on a single pallet that could itself be mounted on a truck or other flatbed vehicle. Laserfire used a millimetric
Doppler radar. Due to its very high frequency of operation and ability to transform its beamshape from narrow azimuth and high elevation to wide azimuth and narrow elevation, Laserfire was able to detect helicopters hovering or travelling at low altitude and in areas of high clutter by detecting the movement of the helicopter's rotor blades. Initial engagement is similar to the original Rapier, but the target was illuminated and automatically tracked by a high power YAG:Nd laser. After the missile was launched the laser alternately illuminated the target and missile to determine their locations, and guidance was sent to the missile as normal (see
laser guidance). Laserfire thus represented a fairly major upgrade to the original optical system, allowing semi-automatic engagements, and greatly reducing operator skill and training requirements. On the downside, Laserfire no longer has the optical system of the original, which served an important second duty by allowing the aircraft to be visually identified at long range. Additionally, while the Laserfire tracking system was capable of being operated at night, target acquisition was optical, like the original Rapier.
Darkfire In 1985 development started on a new tracker that replaced the original optical system with a new
IR thermal imager system to improve its abilities, especially at night. This version was known as "Rapier Darkfire" for this reason. Trials of the new system started in 1987, and were deployed operationally in 1990 as "Field Standard B2" (FSB2), the earlier upgrades retroactively becoming FSB1. This system was also known as "Rapier 90". Cooling for the imager was provided by bottles of compressed gas. FSB2 also introduced a number of improvements that greatly improved Rapier capabilities. First and foremost was the Tactical Control Console that allowed four Rapier launchers to be controlled from a central location. The launchers themselves were upgraded to carry six missiles instead of four, improving battery capacity. Finally, the search radar was updated to use a new
planar array radar, although its capabilities remained generally the same as the earlier model.
Missile upgrades In 1988 tests started on an improved warhead using a proximity fuze, in order to give Rapier capability against smaller targets that would be difficult to hit directly, notably high-speed
remotely piloted vehicles. Serial production of Mk. 1E began in 1989. In 1992 the Army signed a contract to upgrade all Rapier systems to an enhanced version. A Mark 2 missile variant commenced development in 1986 culminating in a complete re-design which entered service in the mid-1990s. Along with a further upgrade of the proximity fuze, the new missile incorporated (then) state-of-art technologies including: Von Karman supersonic aerodynamic profile; composite propellant, with a two-stage shaped burn and laminated body solid rocket motor; ceramic substrate surface mount PCBs; completely new electronic systems and software; both analogue and digital proprietary ASICs; highly ECM resistant front end and command link with redundant encoding; fully Digital Autopilot incorporating Kalman state filtering; inertial navigation comprising ring-laser roll and rate gyroscope; Kapton ribbon cabling. The missile warhead is available in two versions, the Mk. 2A for the normal anti-aircraft role, and the Mk. 2B, which includes a
shaped charge warhead and dual fuzes, and which is useful against light armour as well.
Rapier 2000 , London In 1992, shortly after the introduction of Rapier 90, another major upgrade series started at
MBDA (previously Matra BAe Dynamics). Emerging as "Rapier 2000", or "Field Standard C" (FSC) in British service, the system reached its ultimate form. Development of the FSC system began in 1983 and the systems first entered service in 1996. By this time the Cold War was over and British air defence capabilities were significantly reduced, with fewer and smaller batteries, albeit every fire unit with Blindfire. There is also an export version of this version, known as
Jernas. Malaysia is the first export customer for Jernas. FSC was effectively a new system, although Blindfire was little changed and it could fire both Mk 1 and Mk 2 missiles. The Surveillance radar was removed from the launcher and became a separate element and each launcher now carried eight missiles. With the missiles increasingly relying on radar guidance since the introduction of Blindfire, it made sense to upgrade the original search radar to something much more modern. This was supplied by the Alenia Marconi "Dagger", a 3D
pulse doppler radar with an integrated Cossor
IFF Mark 10 system. Dagger is mounted on its own trailer, so the radome on top of the launcher unit was no longer needed. In its place, a much more modern optical tracking system was added. The new tracker used a
Stirling-cycle cooler instead of compressed gas bottles. The use of much smaller electronics greatly reduced stack height of the whole launcher, allowing an additional two missiles to be added, for a total of eight. In operation, the Rapier 2000 is similar to earlier Blindfire-equipped systems. Targets are acquired visually or through the Dagger radar, and then the Blindfire and optical tracker are slewed onto the target. The optical system can be used solely to track the missile, or it can be used for all guidance, like the original Rapier. In either case the engagement is entirely automatic, with no operator guidance needed. The optical system can also be used as a search system, seeking out IR sources, allowing radar-quiet operation. In 2006 a Ministry of Defence study in Ground Based Air Defence recommended further reductions, based on a reduced air threat and the improved air defence capabilities afforded by the Typhoon fighter. These included removing the role from the RAF Regiment as a measure to preserve Royal Artillery units in the face of significant cuts to the Army. Nevertheless, the Royal Artillery units were placed under command of the
HQ 1 Group RAF (within HQ Air Command) and the
Joint Ground Based Air Defence Headquarters was formed. ==Combat history==