Trident Missiles Nuclear Submarine - Hi-Tech Weaponry

Channel: Spiesleaks   |   2014/03/15
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Trident Missile
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This article contains technical information about the Trident ballistic missile. For a discussion of the British Trident weapons programme, see UK Trident programme
A Trident missile breaking the surface of the water after being fired from a Royal Navy submarine

The Trident missile is a submarine-launched ballistic missile (SLBM) equipped with multiple independently targetable reentry vehicles (MIRV). The Fleet Ballistic Missile (FBM) is armed with nuclear warheads and is launched from nuclear-powered ballistic missile submarines (SSBNs). Trident missiles are carried by fourteen active US Navy Ohio-class submarines, with US warheads, and four Royal Navy Vanguard-class submarines, with British warheads. The original prime contractor and developer of the missile was Lockheed Martin Space Systems.

Development[edit]

Trident I (designated as C4) was deployed in 1979 and retired in 2005.[1] Its objective was to achieve performance similar to Poseidon (C3) but at extended range which improved survivability of the submarine. Trident II (designated D5) had the objective of improved accuracy, and was first deployed in 1990, and was planned to be in service for the thirty-year life of the submarines, until 2027.

Trident missiles are provided to the United Kingdom under the terms of the 1963 Polaris Sales Agreement which was modified in 1982 for Trident. British Prime Minister Margaret Thatcher wrote to President Carter on 10 July 1980, to request that he approve supply of Trident I missiles. However, in 1982 Thatcher wrote to President Reagan to request the United Kingdom be allowed to procure the Trident II system, the procurement of which had been accelerated by the US Navy. This was agreed in March 1982.[2] Under the agreement, the United Kingdom paid an additional 5% of their total procurement cost of 2.5 billion dollars to the US government as a research and development contribution.[3]

D5 Life Extension Program[edit]

In 2002, the United States Navy announced plans to extend the life of the submarines and the D5 missiles to the year 2040.[4] This requires a D5 Life Extension Program (D5LEP), which is currently underway. The main aim is to replace obsolete components at minimal cost by using commercial off the shelf (COTS) hardware; all the while maintaining the demonstrated performance of the existing Trident II missiles. In 2007, Lockheed Martin was awarded a total of $848 million in contracts to perform this and related work, which also includes upgrading the missiles' reentry systems.[5] On the same day, Draper Labs was awarded $318 million for upgrade of the guidance system.[5] Then British Prime Minister Tony Blair was quoted as saying the issue would be fully debated in Parliament prior to a decision being taken.[6] Blair outlined plans in Parliament on 4 December 2006, to build a new generation of submarines to carry existing Trident missiles, and join the D5LE project to refurbish them.[7]

The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in Demonstration and Shakedown Operation (DASO)-23,[8] took place on USS Tennessee (SSBN-734) on 22 February 2012.[9] This was almost exactly 22 years after the first Trident II missile was launched from Tennessee in February 1990.

The total cost of the Trident program thus far came to $39.546 billion in 2011, with a cost of $70 million per missile.[10]

Description[edit]

Trident I first launch on 18 January 1977 at Cape Canaveral

The launch from the submarine occurs below the ocean surface. The missiles are ejected from their tubes by igniting an explosive charge in a separate container which is separated by seventeen titanium alloy pinnacles activated by a double alloy steam system. The energy from the blast is directed to a water tank, which is flash-vaporized to steam. The subsequent pressure spike is strong enough to eject the missile out of the tube and give it enough momentum to reach and clear the surface of the water. The missile is pressurized with nitrogen to prevent the intrusion of water into any internal spaces, which could damage the missile or add weight, destabilizing the missile. Should the missile fail to breach the surface of the water, there are several safety mechanisms that can either deactivate the missile before launch or guide the missile through an additional phase of launch. Inertial motion sensors are activated upon launch, and when the sensors detect downward acceleration after being blown out of the water, the first stage engine ignites. The aerospike, a telescoping outward extension that halves aerodynamic drag, is then deployed, and the boost phase begins. When the third stage motor fires, within two minutes of launch, the missile is traveling faster than 20,000 ft/s (6,000 m/s), or 13,600 mph (21,600 km/h).

The missile attains a temporary low altitude orbit only a few minutes after launch. The Guidance System for the missile was developed by the Charles Stark Draper Laboratory and is maintained by a joint Draper/General Dynamics Advanced Information Systems facility. It is an Inertial Guidance System with an additional Star-Sighting system, which is used to correct small position and velocity errors that result from launch condition uncertainties due to the sub navigation system errors and some errors that have accrued by the guidance system during the flight due to imperfect instrument calibration. GPS has been used on some test flights but is assumed not to be available for a real mission. The fire control system was designed and continues to be maintained by General Dynamics Advanced Information Systems.

Once the Star-sighting has been completed, the "bus" section of the missile maneuvers to achieve the various velocity vectors that will send the deployed multiple independent reentry vehicles to their individual targets. The downrange and crossrange dispersion of the targets remains classified.

The Trident was built in two variants: the I (C4) UGM-96A and II (D5) UGM-133A, however there is no direct relation between these two missiles. While the C4, formerly known as EXPO (Extended Range Poseidon), is just an improved version of the Poseidon C-3 missile, the Trident II D-5 has a completely new design (although with some technologies adopted from the C-4). The C4 and D5 designations put the missiles within the "family" that started in 1960 with Polaris (A1, A2 and A3) and continued with the 1971 Poseidon (C3). Both Trident versions are three-stage, solid-propellant, inertially guided missiles, and both guidance systems use a star sighting to improve overall weapons system accuracy.

Trident I (C4) UGM-96A[edit]

The first eight Ohio-class submarines were built with the Trident I missiles. Trident were also retrofitted onto 12 SSBNs of the James Madison and Benjamin Franklin classes, replacing Poseidon missiles.

Trident II (D5) UGM-133A[edit]

A Trident II missile fires its first stage SRB after an underwater launch from a Royal Navy Vanguard class ballistic missile submarine.

The second variant of the Trident is more sophisticated and can carry a heavier payload. It is accurate enough to be a first strike, counterforce, or second strike weapon. All three stages of the Trident II are made of graphite epoxy, making the missile much lighter. The Trident II was the original missile on the British Vanguard-class and American Ohio-class SSBNs from Tennessee on. The D5 missile is currently carried by fourteen Ohio-class and four Vanguard-class SSBNs. Lockheed Martin has carried out 142 consecutive successful test launches of the D5 missile since 1989, according to a company press release.[11]

Conventional Trident[edit]

The Pentagon proposed the Conventional Trident Modification program in 2006 to diversify its strategic options,[12] as part of a broader long-term strategy to develop worldwide rapid strike capabilities, dubbed "Prompt Global Strike".

The US$503 million program would have converted existing Trident II missiles (presumably two missiles per submarine) into conventional weapons, by fitting them with modified Mk4 reentry vehicles equipped with GPS for navigation update and a reentry guidance and control (trajectory correction) segment to perform 10 m class impact accuracy. No explosive is said to be used since the reentry vehicle's mass and hypersonic impact velocity provide sufficient mechanical energy and "effect". The second conventional warhead version is a fragmentation version that would disperse thousands of tungsten rods which could obliterate an area of 3000 square feet. (approximately 280 square meters).[13] It offered the promise of accurate conventional strikes with little warning and flight time.

The primary drawback of using conventionally tipped ballistic missiles is that they are virtually impossible for radar warning systems to distinguish from nuclear-tipped missiles. This leaves open the likelihood that other nuclear-armed countries might mistake it for a nuclear launch which could provoke a counterattack. For that reason among others, this project raised a substantial debate before US Congress for the FY07 Defense budget, but also internationally.[14] Then Russian President Vladimir Putin, among others, warned that the project would increase the danger of accidental nuclear war. "The launch of such a missile could ... provoke a full-scale counterattack using strategic nuclear forces," Putin said in May 2006.[15]

Operators[edit]

See also[edit]

References[edit]

  1. ^ Popejoy, Mary (5 November 2005). "USS Alabama Offloads Last of C4 Trident Missiles". navy.mil. US Navy. Retrieved 2012-05-16. 
  2. ^ "Letter to Prime Minister Margaret Thatcher of the United Kingdom Confirming the Sale of the Trident II Missile System to the Her Country". 11 March 1982. Retrieved 2012-11-23. 
  3. ^ Ministry of Defence and Property Services Agency: Control and Management of the Trident Programme. National Audit Office. 29 June 1987. Part 4. ISBN 0-10-202788-9. 
  4. ^ "Navy Awards Lockheed Martin $248 Million Contract for Trident II D5 Missile Production and D5 Service Life Extension" (Press release). Lockheed Martin Space Systems Company. 29 January 2002. Retrieved 2009-01-28. [dead link]
  5. ^ a b "Defence.gov: Contracts for Monday 26th November 2007" (Press release). US DoD. 26 November 2007. Retrieved 2010-07-30. 
  6. ^ "Trident decision 'not yet taken'". BBC News. 21 November 2006. Retrieved 2012-11-23. 
  7. ^ "UK nuclear weapons plan unveiled". BBC News. 4 December 2006. Retrieved 2012-11-23. 
  8. ^ "DASO 23 Video". US Navy. 22 February 2012. Retrieved 2012-12-14. 
  9. ^ "Back to the Future with Trident Life Extension" (pdf). Undersea Warfare Magazine (US Navy). Spring 2012. Retrieved 2012-12-14. 
  10. ^ "Analysis of the Fiscal Year 2012 Pentagon Spending Request". Cost of War. 15 February 2011. Retrieved 2012-11-23. 
  11. ^ "Trident D5". Missiles of the World. missilethreat.com. Retrieved 2012-11-23. 
  12. ^ "Future Ballistic Missile Projects (United States), Offensive weapons". Jane's Strategic Weapon Systems. 27 October 2011. Retrieved 2012-11-23. 
  13. ^ Shachtman, Noah (4 December 2006). "Hypersonic Cruise Missile:America's New Global Strike Weapon". Popular Mechanics. Retrieved 2012-11-23. 
  14. ^ Wood, Sara, Sgt. (2006). "Conventional Missile System to Provide Diverse, Rapid Capabilities". US Department of Defense. Retrieved 2006-04-10. 
  15. ^ Rosenberg, Eric (6 October 2006). "Experts warn of an accidental atomic war". San Francisco Chronicle. Retrieved 2006-10-09. 

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