Arleigh Burke Class (Aegis), Guided Missile Destroyers, USA

The first Arleigh Burke Class Aegis destroyer was commissioned in 1991. Contracts for the destroyers have been split between the Northrop Grumman Ship Systems (formerly Litton Ingalls Shipbuilding), based in Pascagoula, Mississippi and the General Dynamics subsidiary, Bath Iron Works, based in Maine. The first 21 ships (DDG51-DDG71) are categorised as Flight I and the next seven (DDG72-DDG78) as Flight II.

The revised Flight IIA ships entered production in late 1997. 24 have been commissioned: USS Oscar Austin (DDG 79) – August 2000; Roosevelt (DDG 80) – November 2000; Winston S Churchill (DDG 81) – March 2001; Lassen (DDG 82) – April 2001; Howard (DDG 83) – October 2001; Bulkeley (DDG 84) – December 2001; Shoup (DDG 86) – June 2002; McCampbell (DDG 85) – August 2002; Preble (DDG 88) – November 2002; Mason (DDG 87) – April 2003; USS Mustin (DDG 89) – July 2003; Chafee (DDG 90) – October 2003; Pinkney (DDG 91) – May 2004; Momsen (DDG 92) – August 2004; Chung-Hoon (DDG 93) – September 2004; James E Williams (DDG 95) – December 2004; Nitze (DDG 94) – March 2005; Halsey (DDG 97) – July 2005; USS Bainbridge (DDG 96) – November 2005; Forrest Sherman (DDG 98) – January 2006, USS Farragut (DDG 99) – June 2006; Gridley (DDG 101) – January 2007: Sampson (DDG 102) – March 2007 and Kidd (DDG 100) – June 2007.

Contracted vessels not yet in service: Truxtun (DDG 103) – launched April 2007; Sterett (DDG 104) – launched May 2007; Dewey (DDG 105); Stockdale (DDG 106) – launched August 2006; Gravely (DDG 107); Wayne E Meyer (DDG 108); Jason Dunham (DDG 109). DDG 112 will be the last of the 62 Arleigh Burke destroyers.

Improvements over the previous Flights include hangars for two SH-60B/F LAMPS helicopters, new combat systems software, an enlarged flight deck, the Evolved SeaSparrow missile, the Kingfisher mine detection sonar, Kollmorgen optronic sight and upgrade of the Aegis radar system.

DESIGN

The entire ship (except the two aluminium funnels) is constructed from steel, with vital areas protected by two layers of steel and 70t of Kevlar armour. There is a platform for rearming and refuelling a LAMPS III SH-60B/F helicopter (with ASW capabilities), but no hangars, the ship is unable to house a helicopter of its own. This is the first US Navy class to be fitted out with anti-NBC warfare protection.

AEGIS COMBAT SYSTEM

The Arleigh Burke class destroyers are equipped with the Aegis Combat System which integrates the ship's sensors and weapons systems to engage anti-ship missile threats.

The Aegis system has a federated architecture with four subsystems – AN/SPY-1 multifunction radar, Command and Decision System (CDS), Aegis Display System (ADS) and the Weapon Control System (WCS). The CDS receives data from ship and external sensors via satellite communications and provides command, control and threat assessment. The WCS receives engagement instruction from the CDS, selects weapons and interfaces with the weapon fire control systems.

The latest Aegis upgrade, Baseline 7.1, was certified by the USN in September 2005 onboard USS Pinkney (DDG 91). The upgrade includes a new radar, AN/SPY-1D(V), which has enhanced electronic countermeasures and more effective capability in littoral environments. Baseline 7.1 is based on COTS (commercial-off-the-shelf) computer architecture. Trials of the upgrade in March 2003 included live firings of the ESSM.

Lockheed Martin is developing the Aegis Ballistic Missile Defense (BMD) capability for the Aegis combat system to engage ballistic missiles with the SM-3 missile. By 2009, 15 Arleigh Burke destroyers will have been fitted with the Aegis Ballistic Missile Defense (BMD) system, which provides the capability for long-range surveillance, tracking and engagement of short and medium range ballistic missiles. The system received US Navy certification for full deployment in September 2006.

Aegis BMD will be the main sea-based component of the US Ballistic Missile Defence System.

The weapons control systems include a SWG-1A for Harpoon, SWG-3 forTomahawk, Mk 99 Mod 3 missile fire control system, GWS34 Mod 0 gun fire control system and Mk 116 Mod 7 fire control system for anti-submarine systems.

WEAPONS

The ships are armed with 56 Raytheon Tomahawk cruise missiles, with a combination of land-attack (TLAM) missiles with a Tercom Aided Navigation System, and anti-ship missiles with inertial guidance. The Standard SM-2MR Block 4 surface-to-air missiles with command / inertial guidance remain at the centre of the Aegis system. Both Tomahawk and Standard missiles are fired from two Lockheed Martin Mk 41 vertical launch systems.

The first test of the weapon control system for the new Tactical Tomahawk (Block IV) took place on USS Stethem (DDG 63) in October 2002. Full-rate production deliveries of the missile began in May 2004 and it entered service with the US Navy in September 2004. The new missile has the capability for mission planning onboard the launch vessel, in-flight targeting and loitering.

In December 2004, Raytheon began deliveries of the latest version of the Standard Missile, the SM-3. SM-3, based on hit-to-kill technology, has a kinetic warhead and is for deployment against short- to medium-range ballistic missiles. The SM-3 Block 1B missile, under development, also incorporates a two-colour infrared seeker and a throttling divert and attitude control system.

There are also eight Boeing Harpoon surface-to-surface missiles and Lockheed Martin ASROC vertical launch anti-submarine systems, armed with the Mark 50 or Mark 46 torpedo. ASROC is launched from the Mark 41 VLS.

Arleigh Burke vessels are being fitted with the Evolved Seasparrow Missile (ESSM), developed by Raytheon. ESSM is an advanced ship self-defence missile for use against anti-ship missiles.

In July 2002, the first ESSM sea launch was carried out by Flight IIA vessel, USS Shoup. The missile was launched from the Mk 41 VLS and the Aegis AN/SPY-1D radar successfully guided the missile to destroy the target. ESSM passed US Navy Operational Testing & Evaluation (OPEVAL) in September 2003 and entered full rate production in March 2004. USS Chaffee and McCampbell have been equipped with the new missiles.

There is one BAE Systems Land & Armaments (formerly United Defense) 127mm Mk 45 gun with Kollmorgen Mk 46 Mod 1 electro-optic sight and two Raytheon / General Dynamics 20mm, six-barrelled Phalanx Mk 15 Close-In Weapon Systems (CIWS). Phalanx Block 1B has been installed on USS Howard, Bulkeley and Cole and is being installed on new build vessels.

The Phalanx 1B upgrade includes a Thales Optronics HDTI5-2F thermal imager, improved Ku-band radar and longer gun barrel providing an increased rate of fire of 4,500rpm. Flight IIA vessel USS Winston Churchill is the first ship to be fitted with the US Navy’s most advanced gun, the Mk 45 Mod 4, which can fire Extended Range Guided Munitions (ERGM) to a range of nearly 60 miles.

The destroyers are fitted with six (two triple) 324mm Mk 32 Mod 14 torpedo tubes, which launch ATK (AlliantTechsystems) Mk 46 or Mk 50 active / passive homing anti-submarine torpedoes.

COUNTERMEASURES

The ship's electronic countermeasures / support measures system is the Raytheon AN/SLQ-32(V)3 which performs radar warning and jamming.

Decoys include two Lockheed Martin Sippican SRBOC 6-barrelled launchers for chaff and infrared flares and the AN/SLQ-25A Nixie torpedo decoy system from Argon ST (formerly Sensytech) of Newington, Virginia.

Argon was awarded a contract for the upgrade of the Nixie system (to be called SLQ-25C) in November 2006. SLQ-25C is scheduled to enter production in 2008. The upgrade will include open architecture software and a new lightweight winch.

Arleigh Burke vessels, along with USN cruisers and LPDs, are being fitted with the BAE Systems Australia mk53 Nulka active missile decoy system. Nulka is a hovering rocket system, which seduces incoming missiles away from the ship.

Nulka was developed by the Australian Defence Science and Technology Organisation in Canberra and Lockheed Martin Sippican in Massachusetts. By August 2007, Nulka had been fitted to 83 USN vessels with 50 more planned.

SENSORS

The air search and fire control radar for the Aegis system is the Lockheed Martin AN/SPY-ID 3D phased array radar, operating at E/F band. Surface search radar is a DRS Technologies AN/SPS-67(V)3 C-band (5.4-5.8 GHz) radar. There is also: Raytheon SPS-64(V)9 I-band navigation radar and three Raytheon AN/SPG-62, I/J-Band radars for fire control.

The sonar suite is the Lockheed Martin SQQ-89(V)6, which includes Edo Corporation AN/SQS-53C bow-mounted active search and attack sonar and the AN/SQR-19B passive towed array.

The suite is being upgraded to SQQ-89(V)15 to allow deployment of the Lockheed Martin AN/WLD-1 Remote Minehunting System.

USS Momsen (DDG 92) was the first vessel to be fitted with the AN/WLD-1 RMS which will feature on all subsequent vessels. AN/WLD-1 includes a Remote Minehunting Vehicle (RMV) that tows the AN/AQS-20A variable depth sonar (VDS).

PROPULSION

The destroyers are powered by four GE LM 2500 gas turbines, each rated at 33,600hp with a power turbine speed of 3,600rpm, driving two shafts, with controllable pitch propellers.

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