Editing Goalkeeper CIWS (section)

==Description==
===Target selection===
[[File:Goalkeeper weapons control console at Explosion Museum.jpg|left|thumb|267x267px|Goalkeeper system control console, on display at [[Explosion Museum of Naval Firepower]]]]
The 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 (NATO)|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.<ref name="rnn">[http://kitsune.addr.com/LCF/goalkeeper.html Goalkeeper CIWS] {{webarchive|url=https://web.archive.org/web/20060218091832/http://www.kitsune.addr.com/LCF/goalkeeper.html |date=2006-02-18}} at the Royal Netherlands Navy LCF Frigate information page</ref> The tracking radar operates in both [[I band (NATO)|I band]] and [[K band (NATO)|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 (radar)|clutter]], which can mask the target at low altitude. A camera system on the assembly provides a visual fall-back for the system operator.

===Target engagement===
[[File:Goalkeeper CIWS target.jpg|thumb|200px|left|A target hit by the Goalkeeper. This target was hit six times in a one-second burst of 70 rounds.]]
The [[GAU-8 Avenger|GAU-8/A Avenger]] [[30 mm caliber|30 mm]], also used by the [[A-10 Thunderbolt II]] aircraft, was selected for the system.  The 30x173mm cartridge has a greater projectile mass than the 20x102mm cartridge fired by the [[Phalanx CIWS]] [[M61 Vulcan]], so it provides much greater destructive power and significantly increased range with similar muzzle velocity.

The 30x173mm MPDS cartridge has a discarding nylon sleeve ([[Sabot (firearms)|sabot]]) with a 21&nbsp;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 number|Mach 2]] [[Sea skimming|sea-skimming]] missile such as the Russian [[SS-N-22|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&nbsp;m and ending with a kill at 300&nbsp;m.<ref name=rnn/>

===Operational history===
Goalkeeper's capabilities have been proven many times during sea-going trials.  During live-fire exercises, many different targets including [[Harpoon missile|Harpoons]], [[Exocet missile|Exocets]] and [[target drone]]s were shot down by Goalkeeper. During anti-piracy operations off the coast of [[Somalia]] the system destroyed several pirate boats and [[skiff]]s that had been seized by the [[Royal Netherlands Navy]].<ref>{{Citation | language = nl | title = Nieuws |trans-title=News | contribution = Tromp ontwapent piraten | place = NL | publisher = Marineschepen | contribution-url = http://www.marineschepen.nl/nieuws/Tromp_ontwapent_piraten.html}}.</ref>

===Comparison with current CIWS===
{| class="wikitable" style="border-collapse:collapse; text-align:center;" summary="Characteristics of modern CIWS"
|+'''Comparison of some modern CIWS'''
|-style="vertical-align:bottom; border-bottom:1px solid #999; "
!
! style="text-align:center;" |{{flagicon |Netherlands}} Goalkeeper CIWS
! style="text-align:center;" | {{flagicon |Russia}} [[AK-630]]<ref>{{Citation | title = Navy | publisher = Indian military | contribution = 267 AK-630 Gatling gun close in weapon system | contribution-url = http://www.indian-military.org/navy/ordnance/close-in-weapon-system/267-ak-630-gatling-gun-close-in-weapon-system.html | access-date = 2010-09-15 | archive-date = 2010-03-15 | archive-url = https://web.archive.org/web/20100315113834/http://www.indian-military.org/navy/ordnance/close-in-weapon-system/267-ak-630-gatling-gun-close-in-weapon-system.html | url-status = dead }}.</ref>
! style="text-align:center;" | {{flagicon |Russia}} AK-630M1-2<ref>{{Citation | place = [[Russia|RU]] | title = Naval | contribution = Roy | contribution-url = http://pvo.guns.ru/naval/roy.htm | publisher = Guns}}.</ref>
! style="text-align:center;" | {{flagicon |United States}} [[Phalanx CIWS]]<ref>{{Citation | title = Data | place = United States | publisher = Navy | url = https://www.navy.mil/Resources/Fact-Files/Display-FactFiles/Article/2167831/mk-15-phalanx-close-in-weapon-system-ciws/}}.</ref>
! style="text-align:center;" | {{flagicon |Italy}} [[DARDO]]<ref>{{Citation | publisher = Nav weaps | title = Weapons | contribution = WNIT 4cm-70 Breda | contribution-url = http://www.navweaps.com/Weapons/WNIT_4cm-70_Breda.htm}}.</ref>
!style="text-align:center;" | {{flagicon |China}} [[Type 730]]<ref name=":0">{{cite web | url=https://weaponsystems.net/system/1120-30mm%20H/PJ11 | title=30mm H/PJ11 }}</ref>
!{{flagicon |China}} [[Type 730|Type 1130]]<ref name=":0" />
|-
! style="text-align:right;" | Mass
|{{convert|9902|kg|lb| abbr= on}}
| {{convert|9114|kg|lb| abbr= on}}
| {{convert|11819|kg|lb|abbr= on}}
| {{convert|6200|kg|lb| abbr= on}}
| {{convert|5500|kg|lb| abbr= on}}
|6,372 kg (14,050 lb) w/o ammo
|7,400 kg w/o ammo
|-
! style="text-align:right;" | Armament
|{{convert|30|mm|in|abbr=on}} 7-barreled [[GAU-8 Avenger]] Gatling gun
| {{convert|30|mm|in|abbr=on}} 6-barreled [[GSh-6-30]] Gatling gun
| {{convert|30|mm|in|abbr=on}} 2 × 6-barreled [[GSh-6-30]] Gatling gun
| {{convert|20|mm|in|abbr=on}} 6-barreled [[M61 Vulcan]] Gatling gun
| {{convert|40|mm|in|abbr=on}} 2-barreled [[Bofors 40 mm Automatic Gun L/70|Bofors 40 mm]]
|30 mm (1.2 in) 7-barrel H/PJ-12 Gatling gun
|30 mm (1.2 in) 11-barrel H/PJ-11 Gatling gun
|-
! style="text-align:right;" | Rate of fire (rounds per minute)
| 4,200
| 5,000
| 10,000
| 4,500
| 600/900
|4,800 to 5,800
|9,000 to 11,000
|-
! style="text-align:right;" | (Effective/ flat-trajectory) range
|{{convert|3500|m|ft|abbr= on}}
| {{convert|4000|m|ft|abbr=on}}
| {{convert|4000|m|ft|abbr= on}}
| {{convert|2600|m|ft|abbr= on}}
| {{convert|4000|m|ft|abbr= on}}
|5,000 m (16,400 ft)
|5,000 m (16,400 ft)
|-
! style="text-align:right;" | Ammunition storage (rounds)
| 1,190
| 2,000
| 4,000
| 1,550
| 736
|1280
|2560
|-
! style="text-align:right;" | Muzzle velocity (per second)
|{{convert|1109|m|ft|abbr=on}}
| {{convert|900|m|ft| abbr=on}}
| {{convert|900|m|ft| abbr=on}}
| {{convert|1100|m|ft|abbr=on}}
| {{convert|1000|m|ft|abbr=on}}
|1,150 (3,800 ft)
|1,150 (3,800 ft)
|-
! style="text-align:right;" | Elevation (degrees)
| −25 to +85°
| −12 to +88°
| −12 to +88°
| −25 to +85°
| −13 to +85°
| -25 to +85°
| -25 to +85°
|-
! style="text-align:right;" | Traverse (degrees)
| 360°
| 360°
| 360°
| -150° to +150°
| 360°
|360°
|360°
|}