Phalanx CIWS

A self-contained, radar-guided 20 mm gun system that provides warships with a final defensive layer against anti-ship missiles and other close-range threats.

Overview

The Phalanx Close-In Weapon System is a rapid-fire, computer-controlled gun mount developed for point defense aboard warships. Its search radar, tracking radar, fire-control equipment, ammunition and 20 mm cannon are integrated into a single mounting, allowing the system to detect, track and engage threats with limited dependence on the ship's wider combat system. Manufacturer Raytheon describes it as a system for defeating anti-ship missiles and other close-in threats at sea or on land.

Phalanx occupies the last layer of a ship's defensive architecture. Longer-range weapons are intended to engage threats first; the gun fires only after an incoming target has penetrated those outer defenses. Its short engagement distance therefore makes every successful interception both a defensive success and evidence that the ship approached the limits of its layered protection.

The current Block 1B configuration adds an electro-optical sensor and improvements intended to address aircraft, drones and small surface craft as well as anti-ship missiles. Phalanx remains in service with the US Navy and several allied and partner navies, supported by a large installed base and an established upgrade and maintenance ecosystem.

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