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| RAM (missile) | |
|---|---|
| Name | RIM-116 Rolling Airframe Missile |
| Caption | RIM-116 launcher aboard a frigate |
| Origin | United States/Germany |
| Type | Shipboard surface-to-air missile |
| Used by | see Operators |
| Designer | RAM Consortium (General Dynamics, Diehl BGT, OTO Melara) |
| Design date | 1980s–1990s |
| Manufacturer | Raytheon, RAMSYS, Diehl |
| Weight | 73 kg (block 1), 87 kg (block 2) |
| Length | 2.79 m |
| Diameter | 127 mm |
| Wingspan | 457 mm |
| Speed | Mach 2+ |
| Filling | Annular blast-fragmentation warhead |
| Guidance | Passive RF, infrared homing, dual-mode in later blocks |
| Launch platforms | Warships, coastal batteries |
RAM (missile) is the RIM-116 Rolling Airframe Missile, a lightweight, quick-reaction, short-range shipboard anti-aircraft weapon originally developed through a US–German partnership. It was conceived to defend surface combatants against anti-ship missiles, aircraft, and asymmetric threats using a fire-and-forget guidance philosophy and minimal integration requirements. The system evolved through incremental blocks to incorporate improved seekers, networked guidance, and expanded engagement envelopes.
The RAM project originated from a multinational initiative involving the United States Navy, Bundeswehr, General Dynamics, Raytheon Technologies, Diehl BGT Defence, and OTO Melara to counter emerging anti-ship threats exemplified by engagements in the Falklands War and intelligence on Exocet and Kh-22 family developments. Early studies paralleled advances in seekers at institutions like Naval Research Laboratory, MIT Lincoln Laboratory, and industrial partners including Westinghouse Electric Company and Texas Instruments. The design emphasized an affordable, modular interceptor that leveraged passive radio-frequency homing derived from work by Hughes Aircraft Company and infrared homing akin to sensors developed by Raytheon and Honeywell. The multinational RAM Consortium formalized requirements, integrating lessons from the First Gulf War missile threats and NATO exercises such as EXOCET replacement trials and Northern Wedding-era maneuvers. Industrial cooperation involved General Dynamics Land Systems, Rheinmetall, and shipbuilders like Bath Iron Works and Fincantieri to ensure launcher compatibility with platforms including Arleigh Burke-class destroyer and FREMM frigates.
The baseline RAM Block 0/1 employed a passive radio-frequency homing head adapted from earlier anti-radiation technology, coupled with an infrared (IR) seeker to enable dual-mode terminal guidance. Block 1A and Block 2 variants incorporate improvements by Raytheon Missiles & Defense, Diehl Defence, and Ramsys to add a larger rocket motor, enhanced fuzing, and a digital autopilot derived from flight control work at Northrop Grumman and Boeing. The Block 2 introduced a new seeker with improved IR resolution and expanded passive RF libraries influenced by research from DARPA projects and sensor suites tested by Naval Surface Warfare Center. Launcher forms range from 21-round box magazines to the compact 11-cell Mk 49 guided missile launcher built by General Dynamics and Lockheed Martin, with options for vertical and oblique mounting compatible with combat systems from Aegis Combat System integrators like Lockheed Martin and Thales Group.
RAM entered service in the 1990s with navies tracking developments from the Yom Kippur War era and the rise of sea-skimming anti-ship missiles such as the Exocet, Harpoon, and Silkworm. Operational deployments included escort missions during operations around Operation Desert Storm and Operation Enduring Freedom where RAM-equipped escorts protected carriers and amphibious groups. Live-fire testing occurred at ranges like White Sands Missile Range and Andøya Test Center, with scoring and telemetry support from Naval Air Systems Command and NATO test centers. Upgrades were fielded after analysis of engagements in the Persian Gulf and exercises with the Royal Navy, Bundesmarine, Hellenic Navy, and Japan Maritime Self-Defense Force, informing software changes implemented by Raytheon and hardware adjustments by Diehl.
Primary operators include the United States Navy, German Navy, Royal Norwegian Navy, Hellenic Navy, Japan Maritime Self-Defense Force, Republic of Korea Navy, Turkish Navy, Royal Danish Navy, Egyptian Navy, and Spanish Navy. Platforms fitted with RAM span Arleigh Burke-class destroyer, Ticonderoga-class cruiser, FREMM-class frigate, MEKO-class frigate, Sa'ar 6-class corvette, and Hyūga-class helicopter destroyer variants built by shipyards like Ingalls Shipbuilding, Navantia, and Mitsubishi Heavy Industries. Cooperative logistics and training are administered via frameworks involving NATO Support and Procurement Agency, bilateral maintenance agreements with Raytheon Germany, and multinational exercises such as Joint Warrior and BALTOPS.
- Manufacturer: Raytheon Technologies, Diehl Defence - Weight: ~73–87 kg depending on block - Length: 2.79 m - Diameter: 127 mm - Speed: >Mach 2 (proportional performance comparable to interceptors like RIM-162 ESSM in terminal phase) - Range: Effective short-range envelope tailored for point defense against sea-skimming threats - Warhead: Annular blast-fragmentation with proximity and contact fuzes developed from Alliant Techsystems technology - Guidance: Passive RF homing, IR homing, dual-mode seekers in Block 2; inertial mid-course updates compatible with combat systems such as Aegis and Combat Management System suites by Thales - Launchers: Mk 49 and other box-type launchers for 11–21 rounds; integration kits produced by General Dynamics and Ramsys
Countermeasures to defeat RAM engagements have driven iterative improvements: modern anti-ship missiles designed by firms like MBDA and Kongsberg Defence & Aerospace use salvo tactics, low-observable shaping, and radar decoys tested in ranges like Pacific Missile Range Facility. In response, upgrades implemented by Raytheon and Diehl introduced spectral-filtering IR seekers, expanded RF library databases drawn from signals intelligence by National Reconnaissance Office and allied services, and improved processing derived from algorithms researched at MIT Lincoln Laboratory and Carnegie Mellon University. Electronic warfare suites by BAE Systems and Thales Group aim to spoof or seduce RAM seekers, prompting development of cooperative engagement capabilities with data links from Link 16 and integration with area defenses like Phalanx CIWS and SeaRAM variants. Modernization roadmaps continue within procurement frameworks of US Navy and allied navies to address hypersonic and maneuvering threats studied in programs overseen by DARPA and national research agencies.
Category:Anti-aircraft missiles Category:Shipborne missiles