IRIS-T SLM Radar Unit TRML-4D ILA-2022

The IRIS-T (infrared imaging system tail/thrust vector-controlled) is a family of short range infrared homing air-to-air and short to medium range surface-to-air missiles. It is also called AIM-2000.

The missile was developed in the late 1990s–early 2000s by a German-led program to produce a short to medium range infrared homing air-to-air missile to replace the AIM-9 Sidewinder in use by some NATO member countries at the time. A goal of the program was for any aircraft capable of firing the Sidewinder to also be capable of launching the IRIS-T. The air-to-air variant was fielded in 2005.

Surface-to-air defence systems variants came later, with the short-range IRIS-T SLS fielded in 2015, and the medium-range IRIS-T SLM fielded in 2022. One IRIS-T SLM battery, as supplied by Germany to Ukraine, consists of three truck-mounted launchers, carrying eight missiles each (with a range of ), and a separate command vehicle that can be positioned up to away. The command vehicle integrates multiple radar sources, and is able to launch and track all 24 missiles simultaneously. The IRIS-T SLM can counter cruise missiles, including low-flying, stealthy missiles such as the Kalibr.

History

Background

In August 1980, the USA, the UK, Germany and France signed a Memorandum of understanding which aimed to develop two types of AAMs to replace existing ones. The USA developed the Advanced Medium-Range Air-to-Air Missile (AMRAAM) to replace the AIM-7 Sparrow, while the Europe team developed the Advanced Short-Range Air-to-Air Missile (ASRAAM) to replace the AIM-9 Sidewinder. This work was dusted off for the UK–German effort, with the Germans providing a new seeker, and the UK providing most of the remaining components.

In 1987, after years of silence on the program, the US proposed a requirement that the weapon must use Sidewinder rails rather than the universal aircraft rail adaptor named the "missile support unit" that had been developed. This delayed the project by one year as the British, German and Norwegian proposals were redesigned. Fearing erosion of its industrial base, the US proposed it would choose the latest version of its existing Sidewinder design with increased manoeuvrability and IRCCM unless the European partners increased the US industrial workshare, designated AIM-9X. However, the Sidewinder upgrade proposal failed to interest NATO buyers.

After German reunification in 1990, Germany found itself with large stockpiles of the Soviet Vympel R-73 air-to-air missiles (NATO reporting name: ''AA-11 Archer'') carried by the MiG-29 Fulcrum and concluded that its capabilities had been noticeably underestimated. It was one of the earliest 4th generation WVRAAM and more capable in dogfight than the former 3rd generation ones. In 1990, Germany withdrew from the ASRAAM project, while the UK resolved to find another seeker and develop ASRAAM according to the original range requirement. In 1992, the missile development programme ultimately separated with the UK the ASRAAM, France the MBDA MICA, US the AIM-9X and Germany electing to restart development on what became the IRIS-T.

Development

In 1995, Germany announced the start of the IRIS-T development, in collaboration with Greece, Italy, Norway, Sweden and Canada. In 1997, Germany had invested more than 500 million DM in this project and held a 46% share. In addition, Italy accounted for 20%, Sweden 18%, Greece 8%, Canada 4% and Norway 3%. Canada later dropped out, while Spain joined as a procurement partner in 2003. The German Air Force took first delivery of the missile in December 2005.

NAMMO Raufoss supplies the rocket engine with its TVC (thrust vector control) for both the IRIS-T air-to-air missile and the SL variants.

Missile characteristics

In comparison to the AIM-9M Sidewinder, the IRIS-T has higher ECM resistance and flare suppression. Improvements in target discrimination allow for five to eight times longer head-on firing range than the AIM-9L and three to four times longer target acquiring range than the AIM-9M. Its seeker can receive cues from radar, helmet mounted display, infrared search and track device, missile approach warner and data link. It can engage targets behind the launching aircraft, made possible by extreme close-in agility, allowing turns of 60 ''g'' at a rate of 60°/s via thrust vectoring and LOAL capability.

The IRIS-T belongs to 5th generation IR-guided missiles which introduce infrared imaging seeker. Compared to the other 5th generation IR-guided missiles, such as AIM-9X, ASRAAM which use staring array, the IRIS-T uses an InSb two-colour seeker based around a 128x2 linear array and a scanning mirror which builds an image from a row of detector elements and scans rapidly across the target. It would produce a 128x128 size image 80 times per second. Each of the elements has a resolution in milliradians. It was regarded to have good resistance against DIRCM. Bodenseewerk Gerätetechnik GmbH (BGT) claimed that scanning arrays were less susceptible than staring arrays as the former receive the DIRCM energy for fractions of a second whereas the latter receive it continuously.

The IRIS-T is able to intercept fast-moving and miniature targets, such as air-to-air/surface-to-air missiles and air-to-surface/surface-to-surface missiles and rockets, UAV/drones, and cruise missiles. To improve the probability of a direct hit, the missile is equipped with a K_u band active radar proximity fuze.

The IRIS-T has the unique ability, in comparison to other similar missiles such as the AIM-9X, to target and shoot down other air-to-air and surface-to-air missiles, thus offering a 360° defence capability. Surface launched variants of the IRIS-T, the IRIS-T SLS and IRIS-T SLM, have enhanced capabilities to destroy aircraft, helicopters, cruise missiles, air-to-surface missiles, anti-ship missiles, anti-radar rockets and large-calibre rockets. They have a high probability of a killing shot against UAVs and other small manoeuvring threats at very-short and medium-range distances.

The Royal Norwegian Air Force (RNoAF) has tested a new air-to-surface capability developed by Diehl BGT Defence for the IRIS-T. A proof of concept test firing to acquire, track, and engage a target representing a small fast attack boat was conducted in Norway in September 2016, where the IRIS-T missile was launched from an RNoAF F-16AM multirole aircraft. For the air-to-surface role, the missile retains the same standard IRIS-T AAM hardware configuration, including the HE warhead and IIR guidance package, with only an updated software insertion required to deliver the additional ground attack capability. This basic air-to-ground capability provides the ability to acquire, track and engage individual ground targets like boats, ships, small buildings and vehicles.

File:IRIS-T Schnitt.jpg, Subassemblies of the IRIS-T
File:Irist expo mount.JPG, German Air Force airmen mount an IRIS-T to a Eurofighter
File:Iris.ogg, Movement of the seeker head

Variants

Operational

By June 2024, three variants were available: The initial ''IRIS-T'' air to air missile with 25 km range, ''IRIS-T SLS'' (short range) with 12 km range and 8 km altitude and ''IRIS-T SLM'' (medium range) with 40 km range and 20 km maximum altitude. A third variant, ''IRIS-T SLX'' (long range) variant with a dual-mode (IR and RF) seeker, a range of 80 km and a maximum altitude of 30 km, is in development .

Due to increased demand due to the Russian invasion of Ukraine, Diehl Defence is increasing production of IRIS-T systems and missiles. It plans to produce three to four systems in 2024 and at least eight in 2025, with missile production planned to grow to around 400 to 500 per year starting in 2024.

IRIS-T air-to-air missile

It is the initial variant of the IRIS-T missile.

IRIS-T SLS

IRIS-T SLS (Surface Launched Standard) is the air defence system which uses the IRIS-T AAM with few software modifications. However, its operational range is reduced from 25 km to 12 km, as has the ceiling from 8 to 6 km. It has a maximum speed of Mach 2 and average speed of 400 m/s, and it cannot attack targets that are closer than 1 km. The IRIS-T SLS has lock-on after launch capability which enable it to launch missiles without actually locking on any target. Once the missile receives the target's data in the form of three-dimensional coordinates, it will employ inertial guidance mode during the initial phase of flight. After attaining the required engagement altitude, the seeker activates and begins scanning the expected target zone. If the radar is unavailable, there is a portable target designator that is equipped with an IR camera and an integrated laser rangefinder. The crew can use it as an alternative to transmit target information to the missile.

In 2018, Diehl Defence demonstrated a Bv 410-based IRIS-T SLS system integrated with a Saab Giraffe 1X radar during the ILA. In 2019, the Swedish Army fielded a ground launched version of the IRIS-T SLS, designated ''Luftvärnsrobotsystem 98'' (lvrbs 98), to replace the RBS 70 missile system. Four missiles are carried on Eldenhet 98 (elde 98) launcher, a special version of a Bv 410 tracked, armored vehicle. Compared to the one demonstrated on the ILA 2018, there was no radar on the Swedish Eldenhet 98. Instead, the Swedish Army used the Underrättelseenhet 23 radar truck as its radar unit.

The Norwegian Army ordered the "mobile ground based air defence system", based on NASAMS command and control solutions, in a direct acquisition with Kongsberg Defence & Aerospace. The system will integrate tracked IRIS-T SLS launchers from Diehl Defence GmbH with High Mobility Launchers for AIM-120 and AIM-9X missiles and XENTA-M radars from Weibel Scientific; initial delivery is planned for 2023 and will include six modified M113 vehicles carrying IRIS-T SLS missiles, while additional launchers will be based on the ACSV.

In 2022, Diehl Defence showed a new air defense system called IRIS-T SLS Mk. III at the Eurosatory. It was a modified Mowag Eagle 6×6 armored vehicle integrated with IRIS-T SLS launcher, Hensoldt Spexer 2000 3D AESA, and a .50 machine gun in the remote controlled weapon station. Its STANAG 4569 protection was level 1, and it could be upgraded to level 3 by adding armor kit. This vehicle had integrated the missile launcher, the radar, the sensors and the C² command system, making it able to operate independently as an air defence system.

In February 2025, it's revealed that a Ukrainian IRIS-T SLS air defense system consisted of two Italian Iveco 4×4 trucks that integrated with SLS missile launcher. The system is also integrated with the TRML-4D radar, which guides the missiles to the target.

File:Eldenhet 98 IRIS-T SLS.png, A Bv 410 with Giraffe 1X radar and Diehl ML-98 IRIS-T SLS launcher on ILA 2018
File:ACSV G5 NOMADS - SHORAD.png, NOMADS mobile air-defence system that can launch IRIS-T AAM
File:IRIS-T SLS Mk. III, Diehl Defense, ILA 2024, Schoenefeld (ILA45463).jpg, IRIS-T SLS with XENTA-M radar on Mowag Eagle V at ILA 2024
File:IRIS-T SLS launcher UA.jpg, Ukrainian IRIS-T SLS missile truck

IRIS-T SLM

IRIS-T SLM (Surface Launched Missile) is the air defence system which uses the IRIS-T SL missile. As a part of the NATO MEADS program, the German Air Force and others are now using this missile. It has a pointed nose, unlike the regular IRIS-T, with a jettisonable drag-reducing nose cone. The missile uses a GPS-aided inertial navigation system, with radio data link for command guidance during the initial approach. The interference-resistant IR seeker head is activated at the terminal stage.

Compared to the IRIS-T, the diameter of the rocket motor was increased by 25 mm, to 152 mm. Test launches from a battery consisting of a CEA CEAFAR radar, a Diehl IRIS-T SL launcher and an Oerlikon Skymaster battle management system were performed in 2014. The IRIS-T SL qualification tests were completed in January 2015 at the Denel Overberg Test Range in South Africa. A further fire test on the developed system of the IRIS-T SLM was completed in January 2022.

An IRIS-T SLM air defence system consists of a tactical operation center, a logistic support unit, several radar units, and 3 or 4 missile trucks. The IRIS-T SLM can be integrated with a variety of electro-optical/infrared (EO/IR) guidance systems and AESA radars, such as Hensoldt TRML-4D, Thales Ground Master 200 MM/C, CEA CEAFAR, and Saab Giraffe 4A. A version with a Lockheed-Martin Skykeeper command and control station, Giraffe 4A radar and Diehl IRIS-T SLM launcher was shown at IDEX 2019 under the name Falcon Ground Based Air Defence.

Egypt ordered Diehl IRIS-T SLM launchers, Hensoldt TRML-4D radars, and fire and control stations equipped with Airbus Defence Fortion IBMS integrated battle management software, all mounted on MAN 8×8 military trucks; the deal was approved by the German government in December 2021. Further orders includes Hensoldt passive radars, IRIS-T SLS launchers and IRIS-T SLX long-range missiles. Passive radars can detect enemy aircraft by analysing reflections from external radio and television signals, making them effective in urban areas where active radars struggle.

The German Air Force has received its first IRIS-T SLM system in 2024 and is to receive five more by 2027. Also, mixed SLS/SLM systems are being planned.

File:IRIS-T_SL_SAM.jpg, An IRIS-T SL missile
File:MAN 7 t mil gl IRIS-T SL.jpg, A MAN SX44 6x6 7-ton IRIS-T SL launcher
File:Iris-T, ILA 2018, Schoenefeld (1X7A6891).jpg, A MAN SX45 8x8 10-ton IRIS-T SLM launcher
File:MAN 10 t mil gl IRIS-T SL ILA2018-2.jpg, A MAN SX45 8x8 10-ton IRIS-T SLM launcher rear
File:IRIS-T-SLM-radar unit TRML-4D front ILA-2022.jpg, A Hensoldt TRML-4D radar
File:CEA Technologies GBMMR on MAN SX45 8x8 chassis ILA-2016.jpg, A CEA CEAFAR (GBMMR) radar
File:ILA 2018, Schönefeld (1X7A5463).jpg, The Thales Ground Master 200 MM/C radar
File:Hensoldt Twinvis, ILA 2018, Schonefeld (1X7A6906).jpg, A Hensoldt TwInvis passive radar

In development

IRIS-T AAM Block 2

In June 2024, Diehl Defence revealed that they were working on a new variant of IRIS-T AAM which will benefit from a new seeker, replacement electronics and a data link capability.

The German parliament approved its financing in December 2024. The contract was signed in January 2025. In February 2025, Sweden, Italy and Spain also joined the effort to modernise the IRIS-T missile.

IRIS-T FCAAM air-to-air missile

Diehl mentioned in 2022 that it was working on a 6th generation of short-range air-to-air missiles, and it is known as the ''"Future Combat Air-to-Air Missile"''. This missile is being designed to become one of the weapons of the European Future Combat Air System. Some new features of IRIS-T FCAAM might include a stealthy non-cylindrical cross-section, multiple-spectrum IR sensor, advanced data processing, a two-way datalink, and a dual pulse/multi-pulse rocket motor.

IRIS-T SLX

IRIS-T SLX is an upgraded variant of IRIS-T surface-to-air missile which has the operational range of 80 km and ceiling of 30 km. It will also use a combined radar and infrared seeker. On the ILA 2024, Diehl Defence displayed a missile model of the developing IRIS-T SLX, which looked quite different to both IRIS-T AAM and IRIS-T SL. This new missile can be integrated into the IRIS-T SLM launchers, which can be loaded with a mix of SL and SLX missiles as the result. Only 50 to 60 soldiers are needed for each system. The Diehl Defence chief programme officer Harald Buschek said this variant was capable of countering standoff weapons, and it was likely to be ready for operation within around 4 years. It also would retain the ability to engage cruise missiles and helicopters.

IRIS-T HYDEF

The Hypersonic Defence (HYDEF) is a program for missile defense against hypersonic threats. The consortium of this project consists of 13 companies from seven European nations. The HYDEF project is based on the successful contract signing in July 2022, dealing with a project study of an overall endo-atmospheric interceptor concept for air defence. At that time, the HYDEF project prevailed over the competitor and could win the Europe-wide tender. Hensoldt and Airbus are also involved as national partners in the HYDEF project. On 31 October 2023, SMS (Spanish Missile Systems, a collaborative proposal of , GMV and SENER AEROSPACIAL from Spain) and Diehl Defence signed the contract with OCCAR, marking the official start of the project. It has the operational range of 100 km and ceiling of 50 km.

On the ILA 2024, Diehl Defence revealed that they were working on a two-stage missile to defend against hypersonic weapons. It will consist of a booster as a starting engine and a warhead called "Kill vehicle" for the direct hit. This should enable it to attack targets at a distance of up to 100 km and an altitude of 50 km with a high level of agility. It should refer to IRIS-T HYDEF.

IRIS-T air-to-surface missile

For the air-to-surface role, the only difference from air-to-air version is an updated software insertion required to deliver the additional ground attack capability. Tested by the Royal Norwegian Air Force.

Naval surface-to-air missile

Diehl mentioned that the IRIS-T SLM missile was being integrated to the Mark 41 vertical launching system.

The German procurement agency BAAINBw signed a contract with Diehl for a feasibility study to integrate the IRIS-T SLM to the (F125) in December 2024. This contract includes a risk analysis, and the production of a system demonstrator.

IDAS

The IDAS variant is a naval version of the missile, and is also being developed for the new Type 212A submarine of the German Navy. IDAS is supposed to engage air threats, small or medium surface vessels or near land targets.

The latest stage of development qualification is planned for 2024. In October 2022, the Germany Ministry of Defense revised the budget proposal and canceled the project to buy the IDAS; however in 2024 the project was restarted.

File:BGT IDAS.jpg, A model of the IDAS
File:Barracuda torpedo and IDAS.jpg, An IDAS and a Barracuda torpedo at the TechDemo'08 Exhibition, 2008

Cancelled projects

LFK NG

LFK NG was a surface-to-air variant that was developed by the Diehl BGT Defence and MBDA/LFK for the Germany air defence plan called SysFla (). Its weight is 28 kg, which is just one third of the original IRIS-T AAM. It would be equipped on the Army's Ozelot air defence system and Eurocopter Tiger. It has the operational range of 10 km. In 2012, the German Army air defence units was disbanded. There's no further news about this variant afterward.

Operators

The following operators are listed and defined as of June 2023.

Air-to-air missiles

Current operators

;
: 25
;
: IRIS-T missiles for the new Saab JAS 39 Gripen E/F variants.
;
: 1,250 missiles in a first order.
: In 2023 a framework contract for up to 1,280 missiles was signed to replace those given as aid to Ukraine (120 ordered in a first batch).
;
: 350 IRIS-T missiles
;
: 444 IRIS-T missiles budget €217m, between 2003 and 2015.
;
: 1,400 IRIS-T missiles
: 150 additional ordered in January 2024 (ordered to replace the ones used to shoot down Houthi drones)
;
: 25 IRIS-T missiles delivered as interim armament for Saab JAS 39 Gripen aircraft until the completion of the A-Darter SRAAM project.
;
: 700 IRIS-T missiles. Original budget €247m, final cost €291m.
;
: 450 IRIS-T missiles, designated ''Jaktrobotsystem 98'' (jrbs 98). IRIS-T SLS variant used in ground-based air defense systems.
;
: 220 IRIS-T missiles ordered. To be integrated with F-5T, Gripen C/D, and F-16 eMLU.

Former operators

;
: 150 IRIS-T missiles. Taken out of service along with the F-16 in 2022. Missiles donated to Ukraine in August 2023.

Future operators

;
: IRIS-T integration for Hungarian Saab JAS 39 Gripen MS20 Block II modernization program was ordered in December 2021.
;
: IRIS-T integration for the KF-X fighter program was ordered in 2018. The first test firing took place in April 2023. On 17 May 2024, Diehl Defence declared that a KF-21 fighter had successfully fired an IRIS-T AAM to attack the target drone designated by the onboard AESA radar.

Potential operators

;
: Trials are ongoing on the IAR-99SM with the IRIS-T missile.

Surface-to-air missiles

Current operators

;
: Using the Airbus Fortion IBMS-FC, a Hensoldt TRML-4D radar installed on a MAN HX2.
:* 7 IRIS-T SLM ground-based air defense systems ordered in 2018. with a further order of 400 SLM missiles
:* 10 IRIS-T SLX systems was approved in December 2021
:* 6 IRIS-T SLS systems

;
: IRIS-T SLS known as ''Luftvärnsrobotsystem 98'' or ''lvrbs 98''. It was ordered in 2013, first system used for trial was delivered in 2016. The system is made of:
:* BvS 10 vehicle with a command post.
:* BvS 10 the trailer of the vehicle on which four IRIS-T SLS missiles are installed.
: 450 IRIS-T missiles, designated IRIS-T SLS variant used in ground-based air defense systems.

;
: Germany provided military aid packages to Ukraine facing the Russian invasion.
:* 12 IRIS-T SLM systems, among which, 6 delivered (1 in October 2022, 1 in April 2023, 1 in October 2023, 1 in May 2024, 1 in December 2024), and additional IRIS-T SLM missiles are being supplied by Germany.
:* 12 IRIS-T SLS systems, with three delivered. One IRIS-T SLS system likely consists of two launchers. The IRIS-T SLM batteries are all equipped with the fire control system Airbus Fortion IBMS-FC and the radar TRML-4D from Hensoldt. Those systems use the MAN HX2 platform. In comparison, each Ukrainian IRIS-T SLS system consists of 2 missile launchers. These launchers are integrated with Iveco 4×4 trucks. They need the Hensoldt TRML-4D mobile radar to guide the missiles.
:* In May 2025, Germany placed an order for an unknown volume of IRIS-T SLS/SLM fire units, worth €2.2 billion. The framework agreement enables to provide up to 10 fire units, and 500 missiles, but depending on the Ukrainian needs, the munitions or the fire units might be prioritized.
: Norway announced in July 2024 that $92 million will be allocated for an IRIS-T SLM battery to be delivered to Ukraine.

; (1 fire unit operational, 5 on order, 2 on option, 216 missiles ordered)
:The German Air Force operates 1 IRIS-T SLM fire unit. The system gained its initial operational capability in September 2024 after having been handed over to the German procurement agency in August 2024.
:In June 2023, the German Air Force ordered 6 fire units with 216 missiles for €950 million, and there is an option for 2 additional fire units. The order is financed from the Bundeswehr special fund. This system is also part of the European Sky Shield Initiative.

Future operators

;
: 8 IRIS-T fire units with 3 launchers each are to be purchased by Austria. It will include IRIS-T SLM and SLS batteries. The decision for this system was announced in September 2023.

;
: The Bulgarian parliament approved the purchase of 1 fire unit of the IRIS-T SLM for the Bulgarian Air Force in August 2024.
: Options for additional fire are mentioned in potential sales.

;
: In May 2023, the Latvian and Estonian governments announced their decision to jointly procure the IRIS-T SLM systems, with deliveries expected in 2025. 3 IRIS-T SLM systems were ordered.

;
:German Army: For the programme LVS NNbS, the IRIS-T missiles will be used, likely to be installed on mobile launchers Boxer.

;
: IRIS-T SLM system contract signed in November 2023 for €600 million, delivery of components from 2026.

;
: The Netherlands are coordinating with Norway for the same system they are using, the mobile GBAD.

;
: Norway is developing its short range air defence, the MGBAD "''mobile ground-based air defence system"''. It is using elements of the NASAMS 3 system, and elements from the IRIS-T SLS system. The purchase includes:
:* 36 IRIS-T SLS missiles
:* 6 mobile launchers PMMC G5 equipped with 6 IRIS-T SLS canister launchers and a XENTA-M X-band radar designed by Weibel Scientific
:* 3 High Mobility Launcher (HML) HMMWV-based equipped with a roof rack with up to 4 AIM-120B AMRAAM or 6 AIM-120C missiles
:* a command and control system based on the NASAMS 3.

;
: Contract for 1 battery of the IRIS-T SLM system signed in December 2023 for €200 million. In early 2025, it was decided that Slovenia would order two more batteries of the IRIS T system. The first battery is expected to be delivered in 2027, and the second and third in 2028.

;
:Swiss Air Force – Tender for ''Bodluv MR Programme'' launched in April 2024. Armasuisse requested an offer to Diehl for a medium range air defence system (a variant of the IRIS-T SL). Diehl is in competition against MBDA