27 Ticonderoga Class (CG 47 – CG 73) Aegis guided missile cruisers were built between 1983 and 1994 by Ingalls Shipbuilding at Pascagoula, Mississippi, and Bath Iron Works (a General Dynamics Company), Bath, Maine. Ingalls Shipbuilding is now part of Huntington Ingalls Industries. Northrop Grumman spun off its shipbuilding businesses into a new company, Huntington Ingalls, in March of 2011.
22 ships are operational, 11 in the US Navy Atlantic Fleet and 11 in the Pacific Fleet, two of which are based in Japan in the US Naval Forces Base at Yokosuka.
A number of Ticonderoga class cruisers were deployed in the Gulf crisis in 1991. Tomahawk missiles were deployed in 1993 against targets in Iraq enforcing ‘no fly zone’ restrictions. The ships also deployed the missile in Bosnia during 1995. Ticonderoga-class cruisers USS Shiloh (CG 67) and USS Mobile Bay (CG 53) were deployed as part of Operation Iraqi Freedom, carrying out a series of combat operations and Tomahawk cruise missile launches.
The first of class, USS Ticonderoga (CG 47), was decommissioned in September 2004. Yorktown (CG 48), Vincennes (CG 49), Valley Forge (CG 50) and Thomas S. Gates (CG 51) have also been decommissioned.
In February 2008, USS Lake Erie (CG 70) successfully fired a Standard SM-3 missile intercepting a non-functioning National Reconnaissance Office satellite before it entered the earth’s atmosphere. The object was to rupture the satellite’s fuel tank to dissipate the hazardous fuel. The satellite, traveling at 17,000mph was hit about 247km over the Pacific Ocean.
Ticonderoga Aegis command and control system
The Ticonderoga class, like the Arleigh Burke class guided missile destroyers, are equipped with the Aegis Combat System which integrates the ship’s electronic sensors and weapons systems to engage anti-ship missile threats.
The Aegis system has a federated architecture with four subsystems – the AN/SPY-1 multifunction radar, the command and decision system (CDS), Aegis display system (ADS) and the weapon control system (WCS).
Aegis Baseline 7.1 is based on COTS (commercial-off-the-shelf) computer architecture and includes a new AN/SPY-1D(V) radar with enhanced electronic countermeasures and more effective capability in littoral environments.
Baseline 7.1 was certified by the USN in September 2005 onboard Arleigh Burke destroyer, USS Pinkney (DDG 91). In December 2007, the USN approved the latest Aegis upgrade, Aegis Open Architecture. USS Bunker Hill will be the first vessel to be equipped with the system. Work on the vessel began in February 2008 under the US Navy’s cruiser modernisation programme (CMP) and all 22 Ticonderoga cruisers will be fitted with Aegis Open Architecture by 2018.
22 of the class (CG52 – CG73) are fitted with two mk 41 Vertical Launch Systems (VLS), each armed with eight Boeing / Raytheon Tomahawk cruise missiles. The first five ships (CG47 to CG51) are fitted with conventional twin launchers. The mk41 launchers are being upgraded with new Lockheed Martin AN/ALQ-70 computers and the ability to launch Evolved Seasparrow Missiles (ESSM).
In the anti-ship role the missile uses inertial guidance and active / passive radar homing to a range of 250nm. The land attack version (TLAM) uses a Tercom (terrain comparison) and inertial navigation system (TAINS). Range is up to 2,500km.
As part of the US Navy cruiser conversion programme, the mk41 launchers are being upgraded with new Lockheed Martin AN/ALQ-70 computers and the ability to launch Evolved Sea Sparrow Missiles (ESSM) and Tactical Tomahawk (Block IV) missiles.
ESSM (which entered service with the USN in 2004) has been developed by Raytheon with an international cooperative of ten NATO countries and is designed to counter high-speed anti-ship missiles.
It has the same semi-active radar guidance and warhead as the Seasparrow but has a new rocket motor and tail control to provide increased speed, range and manoeuvrability. Tactical Tomahawk, which entered service in September 2004, has the capability for mission planning onboard the launch vessel, in-flight targeting and loitering.
Two four-cell launchers for the Boeing Harpoon surface-to-surface missile system are installed on the gun deck at the stern of the ship. Harpoon has a range up to 125km.
The ships are armed with the Raytheon Standard Missile 2MR surface-to-air missile which uses command and inertial guidance and semi-active radar homing and has a range of 70km. 60 missiles are carried for each of the two mk 41 VLS. In November 2002, the Standard Missile SM-3, being developed by Raytheon, successfully intercepted a ballistic missile in space from USS Lake Erie (CG 70).
The SM-3 is designed to intercept ballistic missiles outside the earth’s atmosphere and will form part of the US Navy’s Sea-based Midcourse Defense (SMD). The missile has new GPS/INS (global positioning / inertial navigation) guidance and kinetic warhead. Raytheon began deliveries of the SM-3 in December 2004. Lockheed Martin has developed the Aegis ballistic missile defence (BMD) 3.0 capability for the Aegis combat system to engage ballistic missiles with the SM-3 missile.
USS Shiloh, USS Erie and USS Port Royal have been fitted with the Aegis ballistic missile defence (BMD) 3.6 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. The three cruisers, with 15 Arleigh Burke destroyers form the Aegis BMD fleet. Aegis BMD is the main sea-based component of the US ballistic missile defence system.
A triple 324mm-tube torpedo launcher is capable of launching the mk46 mod 5 torpedo and mk50 torpedo from ATK (Alliant TechSystems). The mk46 anti-submarine torpedo has a range of 10km, the mk50 has a range of 15km.
The Lockheed Martin Vertical Launch ASROC is armed with the mk50 or mk46 torpedo and is launched from the mk41 VLS.
The ship’s main guns are two BAE Systems Land & Armaments (formerly United Defense) mk 45 127mm/54 guns capable of firing 32kg shells to a target range of 22km at a maximum firing rate of 20 rounds a minute.
Two Raytheon Phalanx mk15 close-in weapon systems are installed. Phalanx has a 20mm/53-calibre six-barrel gun capable of firing 3,000 rounds a minute to a target range of 1.5km. Phalanx Block 1B is fitted with a thermal imager and can fire 4,000 rounds a minute.
The ship is equipped with the AN/SLQ-25 Nixie towed torpedo decoy from Argon ST (formerly Sensytech) of Newington, Virginia, and six to eight mk 36 six-barrel launchers for SRBOC from Lockheed Martin Sippican, which fire infrared decoys and chaff. The ship’s electronic support measures and countermeasures system is the Raytheon AN/SLQ-32.
Ticonderoga vessels, along with USN frigates 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.
The ship supports two Sikorsky SH-60B Seahawk helicopters fitted with the LAMPS mission avionics integrated by Lockheed Martin Federal Systems which provides the capability of directing tactical actions by the ship and air team.
The ship’s phased array air search and fire control radar, the Lockheed Martin AN/SPY-1 operating at E and F bands, provides continuous search and tracking of several hundred targets. The air search radar operating at C and D bands is the Raytheon AN/SPS-49.
Also fitted is the Cardion surface search radar AN/SPS-55, operating at I and J band, Lockheed Martin AN/SPQ-9A fire control radar operating at I and J band and four Raytheon AN/SPG-62 fire control radars operating at I and J band.
The Lockheed Martin AN/SQQ-89 sonar combines hull-mounted active search and attack sonar and passive towed array.
The ship’s propulsion system consists of four LM 2500 gas turbine engines from General Electric which provide 86,000hp. The engines drive two shafts with controllable-pitch propellers. The propulsion system provides a maximum speed over 30kt. At an economical speed of 20kt the ship has a range over 6,000 miles.
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