Goalkeeper CIWS

Goalkeeper CIWS
Goalkeeper CIWS on a British Invincible class aircraft carrier
Type	Close In Weapons System
Place of origin	Netherlands
Service history
In service	1980–Present
Used by	See Operators
Production history
Designer	Signaal (now Thales Nederland)
Designed	1975
Manufacturer	Thales Naval Netherlands
Produced	1979
Specifications
Mass	6,372 kg with 1,190 rds of ammunition (above deck), 9,902 kg (total).
Height	3.71 m (above deck) 6.2 m (including deck penetration).
Crew	Automated, with human oversight
Shell	TP, HEI, MPDS, FMPDS
Caliber	30 mm
Barrels	7-barrel (progressive RH parabolic twist, 14 grooves)
Elevation	+85 to −25 degrees at 80 degree/s
Traverse	Unlimited
Rate of fire	70 rounds/second (4,200 rounds/minute)
Muzzle velocity	1,109 m/s (MPDS round)
Effective firing range	350 to between 1,500 and 2,000 meters dependent on ammunition
Main armament	1 x GAU-8/A Avenger 30 mm seven-barrel Gatling gun

Goalkeeper is a Dutch close-in weapon system (CIWS) introduced in 1979 and in use as of 2014. It is an autonomous and completely automatic weapon system for short-range defense of ships against highly maneuverable missiles, aircraft and fast maneuvering surface vessels. Once activated the system automatically performs the entire process from surveillance and detection to destruction, including selection of the next priority target.

Development

Development of the system began in 1975 with Holland-Signaal (now Thales Nederland) working with General Dynamics, which supplied the GAU-8 gun. A prototype, the EX-83 was first demonstrated to the Royal Netherlands Navy in 1979.

In 2012 the Dutch ministry of defense announced that the Goalkeeper systems in use by the Netherlands Navy will receive radar upgrades, mechanical improvements, new high-precision frangible ammunition and a new electro-optical tracking system. Also the system's surface mode will be improved to counter high speed boats and fast attack craft. These upgrades will make the system more capable to defend ships against the latest threats such as modern anti-ship missiles, more effective in littoral environments and less vulnerable to malfunctions. It also expands the life of the system to at least 2025. The first of 16 systems will be upgraded and tested by Thales Nederland, the others at the naval base in Den Helder.

Description

Target selection

Goalkeeper has two radar sub-systems, one to find threats and another to track and engage them, which operate together to identify and prioritise targets, and engage the highest priority one.

The 2D I band search radar, which can handle up to 18 targets at once, generates a threat picture which the gun system uses to identify and prioritize threats. The system has identify friend or foe (IFF) functionality to rule out friendly traces. The tracking radar operates in both I band and K band to enable quick acquisition on the threat bearing. Data from both the I band and K band return signals indicate target range and can be used to identify, and respond to the use of, electronic countermeasures (ECM). The dual band system also reduces the effect of clutter, which can mask the target at low altitude. A camera system on the assembly provides a visual fallback for the system operator.

Target hit by Goalkeeper

Target engagement

The GAU-8/A Avenger 30 mm Gatling gun, as used by the A-10 Thunderbolt II aircraft, was selected for the system. The 30 mm round has a greater mass than the M61 Vulcan used in the Phalanx CIWS, so it provides much greater destructive power with similar muzzle velocity and range.

The 30 mm round has a discarding nylon sleeve (sabot) with a 21 mm sub-calibre tungsten penetrator. The nylon sabot provides a seal between penetrator and barrel, and reduces wear. The tracking radar is capable of monitoring the line of fire and commanding minor adjustments.

Supersonic missiles that are damaged may still have enough momentum to hit the ship—the only way to ensure the protection of the ship is either to detonate the warhead of the missile or obliterate the missile. The system's reaction time to a Mach 2 sea-skimming missile such as the Russian SS-N-22 Sunburn from automatic detection to kill is reported to be 5.5 seconds with the firing synchronized to start the engagement at a range of 1,500 m and ending with a kill at 300 m.

Operational History

Goalkeeper’s capabilities have been proven many times during sea-going trials. During live-fire exercises, multiple different targets including Harpoons, Exocets and target drones were shot down by Goalkeeper. During anti-piracy operations off the coast of Somalia the system destroyed several pirate boats and skiffs that had been seized by the Netherlands Navy.

Comparison with current CIWS

Comparison of some modern CIWS

	AK-630	AK-630M1-2	Phalanx CIWS	Goalkeeper CIWS	DARDO
Weight	9,114 kg (20,093 lb)	11,819 kg (26,056 lb)	6,200 kg (13,700 lb)	9,902 kg (21,830 lb)	5,500 kg (12,100 lb)
Armament	30 mm (1.2 in) 6-barreled GSh-6-30 Gatling Gun	30 mm (1.2 in) 2 * 6-barreled GSh-6-30 Gatling Gun	20 mm (0.79 in) 6-barreled M61 Vulcan Gatling Gun	30 mm (1.2 in) 7-barreled GAU-8 Gatling Gun	40 mm (1.6 in) 2-barreled Bofors 40 mm
Rate of Fire	5,000 rounds per minute	10,000 rounds per minute	4,500 rounds per minute	4,200 rounds per minute	600/900 round per minute
(effective/ flat-trajectory) Range	4,000 m (13,000 ft)	4,000 m (13,000 ft)	3,600 m (11,800 ft)	2,000 m (6,600 ft)	4,000 m (13,000 ft)
Ammunition stowage	2,000 rounds	4,000 rounds	1,550 rounds	1,190 rounds	736 rounds
Muzzle velocity	900 m (3,000 ft) per second	900 m (3,000 ft) per second	1,100 m (3,600 ft) per second	1,109 m (3,638 ft) per second	1,000 m (3,300 ft) per second
Elevation	-12 to +88 degrees	-12 to +88 degrees	-25 to +85 degrees	-25 to +85 degrees	-13 to +85 degrees
Traverse	360 degrees	360 degrees	-150 to +150 degrees	360 degrees	360 degrees

Specifications

• Gun: GAU-8/A Avenger 30 mm seven-barrel Gatling gun.
• Height: 3.71 m (above deck) 6.2 m (including deck penetration).
• Weight: 6,372 kg with 1,190 rds of ammunition (above deck), 9,902 kg (total).
• Elevation +85° to −25° at 80°/s.
• Muzzle velocity: 1,109 m/s (MPDS round).
• Turret speed 360° in 3.8 seconds
• Rate of fire: 70 rounds/second (4,200 rounds/minute).
• Maximum burst size: 1,000 rounds.
• Ammunition: 1,190 linkless (HEI, API, TP, MPDS, FMPDS) rounds in a below-deck magazine.
• Reload time: 9 minutes (loading is done below deck)
• Weapons range: 350 to between 1,500 and 2,000 meters dependent on ammunition.
• Search radar: I band/linear array. I band is X band. Beamsize 1.5 degrees horizontal, 60 degrees vertical. Rotates at 1 Hz (60 RPM). Range approx. 30 km.
• Engagement radar: I band and K band monopulse cassegrain.
• Optical system: TV (Future EO/IR)
• 100% kill distance: 500 m^{[citation needed]}

Operators

• United Kingdom: Royal Navy
  • HMS Illustrious (R06), HMS Bulwark (L15), HMS Albion (L14) (Will be retired from the Royal Navy in 2015)
• Chile: Chilean Navy
  • 2 Jacob van Heemskerck-class frigates
• Netherlands: Royal Netherlands Navy
  • 4 De Zeven Provincien class air-defence frigates, 1 Goalkeeper per ship, full provisions for second system, only HNLMS Evertsen has two Goalkeepers.
  • 2 Karel Doorman class frigates, 1 Goalkeeper per ship
  • 2 Rotterdam class amphibious transport docks, 2 Goalkeepers per ship
  • 1 Karel Doorman class support ship, 2 Goalkeepers (in service 2015)
  • 1 HNLMS Amsterdam Replenishment oiler, 1 Goalkeeper, decommissioned in 2015
• South Korea: Republic of Korea Navy
  • Gwanggaeto the Great-class destroyers
  • Chungmugong Yi Sun-sin-class destroyers
  • Sejong the Great-class destroyers
  • Dokdo-class amphibious assault ship
• Portugal: Portuguese Navy
  • 2 Karel Doorman-class frigates
• Belgium: Belgian Navy
  • 2 Karel Doorman-class frigates
• Qatar: Qatar Armed Forces
  • 4 Vosper Thornycroft Vita-class

External links

• Goalkeeper 49-round burst surface accuracy test onboard of a Netherlands navy frigate.
• Goalkeeper tracking and firing at an aerial target onboard of HNLMs Rotterdam 2009
• ThalesGroup .pdf
• Naval weapons.com article on the Goalkeeper CIWS.
• Goalkeeper CIWS on Youtube
• Test system for Goalkeeper.