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| 20 mm Phalanx | |
|---|---|
| Name | 20 mm Phalanx |
| Origin | United States |
| Type | Close-in weapon system |
| Service | 1970s–present |
| Used by | See "Operators and Global Service" |
| Designer | General Dynamics |
| Manufacturer | Raytheon Technologies |
| Production date | 1970s–present |
| Cartridge | 20×102mm |
| Caliber | 20 mm |
| Action | Gatling rotary cannon |
| Rate | Up to 4,500 rpm (varies by variant) |
| Feed | Linkless feed |
20 mm Phalanx is a United States-developed shipboard close-in weapon system combining a 20 mm Gatling gun, radar, and fire-control system to provide point-defense against anti-ship missiles, aircraft, and small surface threats. Originally fielded in the late 1970s, the system has been integrated on vessels operated by navies including the United States Navy, Royal Navy, Royal Canadian Navy, Japan Maritime Self-Defense Force, and others across global maritime forces. Its role situates it among other naval air-defense technologies such as the Aegis Combat System, RIM-7 Sea Sparrow, and SeaRAM.
Development began as a response to lessons from conflicts like the Yom Kippur War and concerns raised after incidents in the Vietnam War and the Six-Day War, prompting programs within Naval Sea Systems Command and industrial partners including General Dynamics and later Raytheon Technologies to pursue automated, rapid-fire point-defense. The design integrates components from established programs such as the AN/SPG-60 radar family and borrows fire-control concepts used in projects linked to DARPA research and Office of Naval Research initiatives. Engineering choices reflect influences from rotary cannon predecessors like the M61 Vulcan and radar-guided mounts exemplified by work at Lockheed Martin and Northrop Grumman laboratories. Field tests involved trials with platforms including USS Bainbridge (CGN-25), HMS Sheffield, and ships participating in exercises with NATO task groups and the United States Sixth Fleet.
The weapon employs a hydraulically or electrically driven six-barrel Gatling mechanism chambered for 20×102mm rounds similar to ammunition used in M61 Vulcan and aircraft like the F-16 Fighting Falcon and F-15 Eagle. Radar and electro-optical sensors derive tracking data akin to systems produced for platforms such as Phalanx-paired installations and are interoperable with combat systems including Aegis Combat System and command links used by carriers like USS Nimitz (CVN-68). The mount supports a high cyclic rate—comparable to rates found in GAU-8 Avenger research—and features automated safety and engagement logic influenced by protocols from United States Department of Defense acquisition standards. Power, cooling, and feed mechanisms follow naval engineering practices used by ship classes including Arleigh Burke-class destroyer, Ticonderoga-class cruiser, and Type 23 frigate conversions.
Upgrades progressed through blocks and service life-extension programs administered by Naval Sea Systems Command and industry partners including Raytheon Technologies and Boeing. Notable evolutions parallel advancements seen in systems like SeaRAM, integrating missile-based interceptors from firms such as Lockheed Martin and sensor improvements related to technologies developed for the Phalanx Block 1A and Block 1B Baseline 2 programs. International variants and retrofit kits echo modernization patterns observed in programs with Royal Australian Navy and Japan Maritime Self-Defense Force procurements, while compatibility work aligns with standards promulgated by NATO and procurement offices in countries like Canada and Netherlands.
Deployment has spanned carrier strike groups, amphibious assault ships, frigates, destroyers, and auxiliary vessels across fleets including United States Pacific Fleet, Royal Navy, Royal Canadian Navy, Japan Maritime Self-Defense Force, Hellenic Navy, and others. The system has been installed during refits on classes such as Arleigh Burke-class destroyer, Wasp-class amphibious assault ship, Invincible-class aircraft carrier, and various patrol vessels participating in operations like Operation Desert Storm, Operation Enduring Freedom, and Operation Iraqi Freedom. Integration work often involved combat system offices at Naval Air Systems Command and interoperability testing with airborne assets such as E-2 Hawkeye and P-3 Orion.
Phalanx installations have engaged incoming threats in multiple theaters; performance analyses reference encounters during Operation Praying Mantis, engagements in the Persian Gulf and incidents involving small-boat attacks off coasts like Somalia and Yemen. Assessments by naval analysts and studies from institutions including Center for Strategic and International Studies, RAND Corporation, and Naval War College examine hit probabilities, magazine depletion concerns, and engagement timelines compared to other close-in systems such as Goalkeeper CIWS and AK-630. Live-fire trials and fleet reports from ships like USS Stark (FFG-31), HMS Sheffield, and USS Cole (DDG-67) influenced doctrine changes adopted by staffs at United States Fleet Forces Command and allied commands.
Limitations noted in analyses from organizations such as Congressional Research Service and think tanks like International Institute for Strategic Studies include reduced effectiveness against supersonic sea-skimming missiles, salvo attacks, and stealthy cruise missiles encountered during advanced exercises with technologies from Russia and China. Countermeasures and mitigations draw on layered defenses combining systems such as Aegis Combat System, RIM-116 Rolling Airframe Missile, and electronic warfare suites developed by BAE Systems and Thales Group. Maintenance and logistical constraints reference supply chains involving contractors like Raytheon Technologies and fleet support centers at Norfolk Naval Shipyard and Yokosuka Naval Base.
Operators span numerous navies and coast guards including United States Navy, Royal Navy, Royal Canadian Navy, Japan Maritime Self-Defense Force, Hellenic Navy, Royal Australian Navy, Spanish Navy, Italian Navy, Netherlands Navy, Turkish Navy, Egyptian Navy, Chinese Taipei Navy, Republic of Korea Navy, Indian Navy, and others, with installations documented on ship classes such as Arleigh Burke-class destroyer, Type 054A frigate refits, and indigenous variants tailored for fleets like Royal Moroccan Navy acquisitions. Export and collaboration agreements involved defense ministries of countries including Canada, Australia, Japan, Greece, and procurement offices coordinated with organizations like NATO and bilateral defense committees.
Category:Naval weapons