Sejong the Great-class destroyer

The Sejong the Great-class destroyers (Sejongdaewang-Ham or Hangul: 세종대왕급 구축함, Hanja: 世宗大王級驅逐艦), also known as KD-III, are guided missile destroyers of the Republic of Korea Navy (ROKN). The second ship was commissioned in August 2010. As of 2010, the ROKN has committed itself to deploy three ships with an option for three more.


The ship features the Aegis Combat System (Baseline 7 Phase 1) combined with AN/SPY-1D multi-function radar antennae.

Baseline 7 will also be developed in two phases. Baseline 7 Phase I is planned for the last ship in FY 1998 and Phase II is planned for the last ship in FY 2002. Major Baseline 7 upgrades include but are not limited to: AN/SPY-1D(V) radar upgrade, integration of Cooperative Engagement Capability (CEC) and Tactical Ballistic Missile Defense (TBMD) capability (first forward fit implementation), advanced computer architecture, ID upgrades Phase II, Cueing Sensor, STANDARD Missile-2 Block IIIB full integration, Advanced Integrated Electronic Warfare System (AIEWS) Phase I and II, Light Airborne Multipurpose System (LAMPS) helicopter Mark III Block II, Advanced Tactical Support, integrated Naval Surface Fire Support (NSFS), and Mark 50 torpedo with Periscope Depth Attack. Source

Image: globalsecurity.orgROK King Sejong the Great 991


Army/Navy Joint Electronics Type Designation System/AN/SPY-1 Radar is critical for the U.S. Navy’s aerial radar infrastructure and is a key component of Aegis Ballistic Missile Defense System at sea and on land. U.S. Navy cruisers and destroyers employ SPY-1—in addition to a number of foreign vessels—for Aegis Sea-Based BMD, while on land, the radar system is utilized by Aegis Ashore missile defense sites. Developed by Lockheed Martin, SPY-1 radar was originally designed as an air defense system, but has been upgraded to include a ballistic missile defense (BMD) capability. SPY-1’s passive electronic scanning system is computer controlled, using four complementary antennas in order to provide full 360 degree coverage. It operates in S-band and is a multi-function phased-array radar capable of search, automatic detection, transition to track, tracking of air and surface targets, and missile engagement support.


The SPY-1 can maintain continuous radar surveillance while automatically tracking more than 100 targets at one time. Public numerical figures on the SPY-1 detection range claim that it can detect a golf ball-sized target at ranges in excess of 165 km. When applied to a ballistic missile-sized target, the SPY-1 radar is estimated to have a range of 310 km. The system is designed for blue water and littoral operations however SPY-1 configuration must be modified to look above the terrain to avoid causing excessive false targets from land clutter. Configuration changes to mitigate this technical issue have made it more difficult for AN/SPY-1 to identify and track low and fast targets.

User imageImage:

Regional Defense—Engagement Capability Aegis BMD systems are capable of detecting, tracking, targeting, and intercepting cruise and ballistic missile targets. After detecting and identifying a regional missile threat, Aegis BMD can engage and intercept the target using Standard Missile variants guided by tracking information provided by SPY-1. Aegis BMD-equipped cruisers and destroyers are being equipped with the capability to intercept short- and medium-range ballistic missiles as quickly as 10 seconds after the radar “sees” the missile’s movement.

ROK King Sejong the Great 991 – Image:

SPY-1 Variants

Four different SPY-1 radar variants are currently deployed on U.S. ships. The original SPY-1 variant was a test version of the radar that was never deployed. The SPY-1A and 1B variants are equipped by Aegis cruisers and have two antenna faces on each of the two deckhouses, while the SPY-1D and 1D(V) variants are equipped by Aegis destroyers and have four antenna faces, each antenna covering slightly more than 90° in azimuth. All U.S. Aegis systems that have been upgraded for BMD are equipped with either the 1B, 1D, or 1D(V) version.

  • SPY-1A The SPY-1A was installed on the first Aegis cruiser, the USS Ticonderoga (CG 47), which was deployed in 1981. The U.S. Navy is currently in the process of phasing out the SPY-1A and most Aegis cruisers employ the upgraded 1B variant.
  • SPY-1B This SPY-1 variant has an improved antenna that is better suited to operate in a cluttered environment. The SPY-1B also has around twice the average power of the SPY-1A. 1B is currently employed by most Aegis cruisers.
  • SPY-1D The SPY-1D was the first SPY-1 radar developed for Aegis destroyers. This variant is similar to the 1B version, however, one transmitter is used by the 1D to drive all four radar faces, which are all located on a single deckhouse. This upgrade also improves the radar’s performance against low-altitude, reduced radar cross-section targets in heavily cluttered environments and in the presence of electronic countermeasures. The four U.S. destroyers based in Rota, Spain in 2015 as part of the European Phased Adaptive Approach (EPAA) are equipped with SPY-1D radar.
  • SPY-1D(V) Called the “littoral warfare” radar, the SPY-1D(V) improved clutter rejection and moving target detection, enhancing the capability of Aegis radar in cluttered environments.
  • SPY-1F This variant—known as the “frigate array radar system”—is designed for Aegis frigates and is a smaller version of the SPY-1D. While not employed by the U.S. Navy, the SPY-1F is used by Norway on their Fridtjof Nansen-class Aegis frigates.

Current Status

The next effort to modernize the Aegis fleet is called Aegis ACB 20, which calls for a new version of the DDG-51 destroyer equipped with a new radar, called the AN/SPY-6, which is more capable for BMD and Anti-Air Warfare (AAW) than the SPY-1. These new DDG-51 destroyers are currently scheduled to enter service in 2023. Source

Raytheon Secures Aegis Radar Transmitter Contract

Integrated Defense Systems division has won a contract from the U.S. Navy for the production of Aegis Weapon System AN/SPY-1D(V) Radar Transmitter Group, Missile Fire Control System MK 99 equipment, and associated engineering services. The contract is valued at $365.8 million.

This contract has options which, if exercised, will bring the total contract value to $423 million. The contract falls under the Foreign Military Sales program that includes purchases for South Korea and Japan apart from purchases for the U.S. Navy. Work under this contract is expected to be completed by Oct 2022.

The SPY-1D(V) Transmitter and the MK 99 Fire Control System are an essential part of the Navy’s Aegis missile defense system. Over the past 35 years, these systems have been in continuous production and are in use aboard 108 warships worldwide, comprising 17 ships sailed by foreign nations. Link

The SPY-1D radar system is the multi-function, phased-array, three-dimensional (range, altitude, and bearing) radar which conducts search, automatic detection, and tracking of air and surface targets. The SPY-1D also provides mid-course guidance for the SM-2 missile, and has also demonstrated a capability to track theater ballistic missiles. The AN/SPY-1D(V), under development for installation in some Flight IIA ships, is an improved system with better performance against targets in clutter, additional moving target indicator (MTI) waveforms, and greater ability to counter deceptive Electronic Attack measures. Source

Mk 99 Missile Fire Control System

Mk 99 MFCS

The Mk 99 MFCS controls the loading and arming of the selected weapon, launches the weapon, and provides terminal guidance for AAW (Anti-Air Warfare) missiles. It also controls the target illumination for the terminal guidance of SM-2.

Radar and weapon systems on an AEGIS class cruiser.

The radar system associated with the Mk 99 MFCS is the missile illuminator AN/SPG-62.

Missile illuminator AN/SPG-62


AN/SPG-62 RADAR.-The AN/SPG-62 is I/J­Band fire control radar. The SPY-1 radar system detects and tracks targets and then points the SPG-62 toward the target, which in turn provides illumination for the terminal guidance of SM-2 missiles. Remember that in order to track a target you need a very narrow beam of RF energy. The narrower the beam, the more accurately you can tell if you have one target or multiple targets (this is called radar resolution). This narrow beam radar is normally a second radar that works with a primary search or track radar. The AN/SPG-62 illuminating radar works as a second radar with the AN/SPY-1 series radar.

In addition to the Mk 99 MFCS, the AEGIS SPY 1 series radar works with the Gun Fire Control System. Source

ROK King Sejong the Great 991 – Image:
The Sejong the Great class is the third phase of the South Korean navy’s Korean Destroyer eXperimental (KDX) program, a substantial shipbuilding program, which is geared toward enhancing ROKN’s ability to successfully defend the maritime areas around South Korea from various modes of threats as well as becoming a blue-water navy.
At 8,500 tons standard displacement and 11,000 tons full load, the KDX-III Sejong the Great destroyers are by far the largest destroyers in the South Korean navy, and built slightly bulkier and heavier than Arleigh Burke-class destroyers or Atago-class destroyers to accommodate 32 more missiles. KDX-III are currently the largest surface warfare ships to carry the Aegis combat system.

Arleigh Burke class of guided-missile destroyer

5-image-arleigh-burkeUS Navy’s Arleigh Burke class guided missile destroyer USS Cole (DDG 67) – Image:

The Arleigh Burke class of guided-missile destroyers was designed as a gas turbine-powered replacement for the Coontz class missile destroyers and the Leahy- and Belknap- classes of missile cruisers.

Originally intended to be a cheaper, less capable vessel than the Ticonderoga class cruiser, the design has evolved into an extremely capable general purpose warship, incorporating highly advanced weaponry and systems.

Arleigh Burke (DDG 51) was the first large US Navy vessel designed to incorporate stealth shaping techniques to reduce radar cross-section. Originally tasked with defending against Soviet aircraft, missiles and submarines, this potent destroyer is now used in high-threat areas to conduct anti-air, anti-submarine, anti-surface, and strike operations.

Entered service 1991
Crew 303 – 327 men
Sea endurance ?
Dimensions and displacement
Length 142.1 m
Beam 18.3 m
Draught 7.6 m
Displacement, standard 8 300 tons
Displacement, full load 9 200 tons
Propulsion and speed
Speed 32 knots
Range 8 100 km at 20 knots
Propulsion 4 x General Electric LM2500 gas turbines delivering 105 000 shp to two shafts
Helicopters 2 x Sikorsky SH-60 Seahawk
Artillery 1 x 127-mm DP gun, 2 x 20-mm Phalanx CIWS mountings
Missiles 2 x quadruple Harpoon anti-ship missile launchers, 2 x Mk 41 vertical launch system (90 Standard SM-2MR, ASROC and Tomahawk missiles)
Torpedoes 2 x tripple 324-mm Mk 32 ASW torpedo tubes for Mk 46/50 torpedoes

Atago-class destroyer

DDG-178-Ashigara-019178 Ashigara Atago class guided missile destroyer Japan maritime self defense force jmsdf Aegis – Image:

The Atago class of guided missile destroyers (あたご型護衛艦|atago-gata-go-ei-kan) is an improved version of the Japan Maritime Self-Defense Force (JMSDF)’s Kongō class.

The fire-control system for the Atago class is the Aegis Weapon System Baseline 7 phase 1, which will combine American- and Japanese-manufactured systems to make up the complete Aegis system.

Atago in 2014

Class overview

Name: Atago class
Built: 2004–2008
In commission: 2007–
Completed: 2
Active: 2
General characteristics
Type: Guided missile destroyer
Displacement: ·7,700 tons standard

·10,000+ tons full load

Length: 165 m (541 ft 4 in)
Beam: 21 m (68 ft 11 in)
Draft: 6.2 m (20 ft 4 in)
Propulsion: ·4 Ishikawajima Harima/General Electric LM2500-30 gas turbines

·Two shafts 5-bladed CP props

·100,000 shp (75,000 kW)

Speed: 30 knots (56 km/h)
Boats & landing
craft carried:
Rigid hull inflatable boat
Complement: 300
Armament: ·1 × 5 inch (127mm/L62) Mk-45 Mod 4 naval gun in a stealth-shaped mount. (Made by Japan Steel Works licensed from its original manufacturer)

·2 × missile canister up to 8 Type 90 (SSM-1B)

·2 × 20 mm Phalanx CIWS

·2 × Type 68 triple torpedo tubes (6 × Mk-46 or Type 73 torpedoes)

·96-cell Mk-41 VLS:

·(64 at the bow / 32 cells at the stern aft) for a mix of:

·SM-2MR Standard Missile

·SM-3 Anti-Ballistic Missile

·RUM-139 Vertical Launch ASROC (Anti-Submarine)

Aircraft carried: 1 × SH-60K helicopter
Aviation facilities: Flight deck and enclosed hangar for one helicopter



ROK King Sejong the Great 991

Sejong the Great-class destroyers’ main gun is the 127 mm/L62 Mk. 45 Mod 4 naval gun, an improved version of the same gun used on other warships from several foreign nations. Point-defense armaments include one 30 mm Goalkeeper CIWS and a RIM-116 Rolling Airframe Missile Block 1 21-round launcher, the first Aegis platform to carry RAM. Anti-aircraft armament consists of SM-2 Block IIIA and IIIB in 80-cell VLS.

127 mm/L62 Mk. 45 Mod 4 naval gun

Mk-45 Mod. 4 (5-inch/62-caliber)

The Mk-45 Mod. 2 (5-inch/54-caliber) lightweight gun is a modern U.S. naval artillery gun mount consisting of a 5-inch (127 mm) L54 Mark 19 gun on the Mark 45 mount. Originally, the gun was designed and built by United Defense, it is now manufactured by BAE Systems Land & Armaments after the former was acquired. The latest Mk-45 Mod. 4 (5-inch/62-caliber) version consist of a longer barrel L62 Mark 36 gun fitted on the same Mark 45 mount. The gun is designed for use against surface warships, anti-aircraft and shore bombardment to support amphibious operations.

The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied by a three-man crew (gun captain, panel operator, and ammunition loader) below deck to keep the gun continuously supplied with ammunition.

Mk-45 Mod 4 Naval Gun System – Image:

Development started in the 1960s as a replacement for the 5″/54 caliber Mark 42 gun system with a new, lighter, and easier to maintain gun mounting. In USN use, the Mark 45 is used with either the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System. Since before World War II, 5″ has been the standard gun caliber for U.S. Naval ships. Its rate of fire is lower than the British 4.5-inch (114 mm) gun, but it fires a heavier 5″ shell which carries a larger burst charge that increases its per-shell effectiveness against aircraft.

Mod 0: used mechanical fuze setter. Two piece rifled construction, with replaceable liner.
Mod 1: electronic fuze setter replaces the mechanical one. Made with a unitary construction barrel, which has a life span approximately twice that of the Mark 42 gun.
Mod 2: export version of Mod 1, but now used in the US Navy (DDG 51-80 / CG’s)
Mod 3: same gun with a new control system; never put into production.
Mod 4: longer 62 caliber barrel for more complete propellant combustion, higher velocity, greater range at +20 nm (36 km) and thus more utility for land attack

Technical data:
Caliber: 5 inch (127 mm)
Barrel lenght: Mod.2: 270 inch (6,86 meters) / Mod.4: 310 inch (7,87 meters)
Shell: 70 lb (31,75 kg)
Elevation: – 15° to + 65°
Rate of fire: 16-20 rpm
Effective Range: 13 NM (24,1 km) / Mod.4 = 20 NM (37 km)

Used on:
US Navy
Ticonderoga class CG
Arleigh Burke class DDG
California class CGN
Virginia class CGN
Spruance class DD
Kidd class DDG
Tarawa class LHA

and ships of the following Navies:
Australia, Danmark, Greece, Japan, Taiwan, New Zealand, Spain, Thailand, South Korea, Turkey.


ROK King Sejong the Great 991 – Image:

30 mm Goalkeeper CIWS

Goalkeeper is a Dutch close-in weapon system (CIWS) introduced in 1979 and in use as of 2015. 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 undertakes the entire air defense process from surveillance and detection to destruction, including selection of the next priority target.

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 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 but significantly reduced 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.


Seoae Ryu Seong-ryong (993) – imange:

RIM-116 Rolling Airframe Missile Block 1


The RAM program is designed to provide surface ships with an effective, low-cost, lightweight, self-defense system which will provide an improved capability to engage and defeat incoming antiship cruise missiles (ASCMs). RAM is a joint United States and German venture to design an effective, low cost, lightweight quick-reaction, self-defense system which will increase the survivability of otherwise undefended ships. It is a 5 inch missile that utilizes SIDEWINDER technology for the warhead and rocket motor, and the STINGER missiles seeker. Cueing is provided by the ships ESM suite or radar. The MK-31 RAM Guided Missile Weapon System (GMWS) is defined as the MK-49 Guided Missile Launching System (GMLS) and the MK-44 Guided Missile Round Pack (GMRP).


The RAM Block 0 has a five-inch diameter airframe that rolls in flight and dual mode, passive radio frequency/infrared (RF/IR) guidance. Initial homing for RAM Block 0 is in RF, using an ASCM’s RF seeker emissions. If the ASCM’s IR radiation is acquired, RAM transitions to IR guidance.


Effective against a wide spectrum of existing threats, the RAM Block 1 IR upgrade incorporates a new IR “all-the-way-homing” guidance mode to improve AW performance against evolving passive and active ASCMs. The Block 1 missile retains all capabilities of the Block 0 missile while adding two guidance modes, IR only and IR Dual Mode Enable (IRDM). The IR only mode guides on the IR signature of the ASCM. The IRDM will guide on the IR signature of the ASCM while retaining the capability of utilizing RF guidance if the ASCM RF signature becomes adequate to guide on. RAM Block I can be launched in an IR all-the-way mode, as well as the dual mode (passive RF, followed by passive IR) used by Block 0.


The launching system and missiles comprise the weapon system. Source

Yulgok Yi I (992) – image:

S. Korean Navy’s Aegis destroyers to get upgraded missile launch systems: Here

“The Navy is moving to install new vertical missile launch systems on its three King Sejong the Great class ships that will allow them to launch the longer range SM-3 and SM-6 ship-to-air missiles, said the military source who declined to be identified.”

SM-2 standard missile Block IIIA & IIIB

The Standard Missile-2 (SM-2) is the Navy’s primary surface-to-air fleet defense weapon. The currently deployed SM-2 Block II/III/IIIA configurations are all-weather, ship-launched medium-range fleet air defense missiles derived from the SM-1 (RIM-GGB), which is still in the fleet. SM-2 employs an electronic countermeasures-resistant monopulse receiver for semi-active radar terminal guidance and inertial midcourse guidance capable of receiving midcourse command updates from the shipboard fire control system. SM-2 is launched from the Mk 41 Vertical Launching System (VLS) and the Mk 26 Guided Missile Launching System (GMLS). SM-2 continues to evolve to counter expanding threat capabilities, and improvements in advanced high and low-altitude threat interception, particularly in stressing electronic countermeasures (ECM) environments, are being implemented through modular changes to the missile sections.

The Standard Missile was produced in two major types, the SM-1 MR/SM-2 (medium range) and the SM-2 (extended range). It is one of the most reliable in the Navy’s inventory. Used against missiles, aircraft and ships, it first came into the fleet more than a decade ago. It replaced Terrier and Tartar missiles and is part of the weapons suit of more than 100 Navy ships.

The SM-2 is a solid propellant-fueled, tail-controlled, surface to air missile fired by surface ships. Designed to counter high-speed, high-altitude anti-ship cruise missiles (ASCMs) in an advanced ECM environment, its primary mode of target engagement uses mid-course guidance with radar illumination of the target by the ship for missile homing during the terminal phase. The SM-2 can also be used against surface targets. SM-2 Blocks II through IV are long-range interceptors that provide protection against aircraft and antiship missiles, thereby expanding the battlespace.

The Block II version of SM-2 includes a signal processor to provide less vulnerability to ECM, an improved fuze and focused-blast fragment warhead to provide better kill probability against smaller, harder targets, and new propulsion for higher velocities and maneuverability.

Block III version of SM-2 provides improved capability against low altitude targets.

Block IIIA, a modification to this version, extends capability to even lower altitudes. RIM-66C Block IIIA includes a new warhead that imparts greater velocity to warhead fragments in the direction of the target.

Block IIIB is the next step in the continuing evolution of the Standard Missile family, incorporating an infrared (IR) guidance mode capability developed in Missile Homing Improvement Program (MHIP) with the radio frequency (RF) semi-active guidance system of the proven SM-2 Block IIIA. The MHIP dual-mode RF/IR guidance capability is being incorporated to counter a specific fielded and proliferating electronic warfare systems in existing aircraft and ASCM threats. OPEVAL of SM-2 Block IIIB was conducted during April 1996, with missile firings by an Aegis cruiser that was completing workup training for deployment. Based on OPEVAL results, SM-2 Block IIIB is operationally effective and suitable.


CIC (Combat Information Center) aboard the ROKS Yulgok Yi I (DDG-992) – image :

Anti-submarine warfare armaments consists of both K-ASROC Hong Sahng-uh (Red Shark) anti-submarine rockets and 32 K745 LWCheong Sahng-uh (Blue Shark) torpedoes. Anti-ship capability is provided by 16 SSM-700K Hae Sung (Sea Star) long-range anti-ship missile, each with performance similar to the U.S.Harpoon. Land-attack capability is provided by the recently developed Hyunmoo-3C (Guardian of the Northern Sky) cruise missile, which is similar to the U.S. Tomahawk.

SSM-700K Hae Sung anti-ship missiles

SSM-700K Hae Sung anti-ship missiles – Image:

SSM-700K Haeseong (C-Star) Anti-ship Missile (Hangul: 해성 미사일) is a ship launched anti-ship cruise missile developed by the Korea Agency for Defense Development (ADD), LIG Nex1 and the Republic of Korea Navy in 2003. The missiles are deployed on KDX-II and KDX-III destroyers as of 2006, each carrying 8 and 16 of the missiles respectively.

During the 1970s the Republic of Korea Navy decided to import Exocet anti-ship missiles to deter North Korean naval provocations. Considering the fact that the DPRK Navy is composed of numerous small to midsize ships, a cheap, small guided anti-ship missile was proposed. In 1978 the Korean Agency for Defense Development (ADD) started the development of the Hae Ryong anti-ship missile, and by 1987 the ROK Navy approved for the mass production of the missiles. But the Hae Ryong was fitted with a semi-active laser guidance system, limiting its tactical capability during bad weather. Additional pressure from the USA ultimately resulted in the termination of the project.

In 1990, the problem of large proportions of the defense budget going into buying anti-ship missiles from foreign countries was brought up. The ROK Navy ordered the ADD to develop a missile that was in par with or better in performance than the Harpoon Block 1C missile. The new missile was codenamed Haeseong, and research of the following core missile technologies was started in 1996.

1900449.jpgSSM-700K Hae Sung I (Sea Star) Anti-ship Missile on the South Korean destroyer Dae jo Yeong at Montreal, October 14, 2013. (Photo/Dennis J. Dubinsky) – Image:
  • Microwave Seeking System
  • Inertial Navigation System
  • Radio Altimeter
  • Electronic Jamming system
  • Turbofan Engine

After 7 years of research, on August 21, 2003, the ADD successfully test fired the Haeseong and sunk the target dummy vessel. On December 20, 2005 the first production model was successfully fired from ROKSDae Joyeong (DDH 977) KDX-II class destroyer. Source

Hyunmoo III land attack cruise missiles

The Hyumu-3, also known as Hyunmoo III or Hyun-Mu which means ‘a God defending the North’ in Korean, is a family of land attack cruise missile developed by the Agency for Defense Development and LIG Nex1 to meet the requirements of the Republic of Korea Army (RoKA). The Hyumu-3 is at some extent based on the Hyunmu-1/2 tactical ballistic missile but using a low altitude cruise missile trajectory with a greater range. The RoKA has deployed the Huynmu-3 long-range land attack cruise missiles in three versions introduced in the 2010-2011 timeframe. The purpose of this long range missiles is to provide deterrence against North Korea and other countries surrounding the Republic of Korea.

The Hyunmu-3C, also known as Hyunmoo III-C, is a surface-to-surface land attack cruise missile developed by the Republic of Korea to hit nuclear sites and targets in North Korea with a Circular Error Probable (CEP) of two meters. The cruise missile with a maximum range of 1,500 km and a warhead of 450 kg is also capable of reaching targets in China, Russia and Japan. The guidance system combines the inertial navigation system with some sort of terrain matching system. The Hyunmu-3C missile existence, the longest range strike weapon in South Korea’s arsenal, was revealed in July 2010 and was expected to be deployed along the border with North Korea in the same year.

CEP: 2 meter
Max Range: 1,500 kilometer (810 nautical mile)

Warhead: 450 kilogram


K-ASROC Red Shark in (VLC)

K-ASROC Red Shark –  Image:

The Hong Sang Eo (Red Shark) torpedo (Hangul: 홍상어 어뢰), also called the K-ASROC, is a vertically launched anti-submarine missile successively developed and tested by South Korea’s University of Science and Technology, the Korea Agency for Defense Development (ADD) and the Republic of Korea Navy in 2009. The Red Shark missile has a range of 12 miles (19 km) and carries a K745 Blue Shark torpedo that is deployed by parachute near the intended target. After release, the Blue Shark independently searches for the target.

The missiles are planned to be deployed on KDX-II and KDX-III destroyers starting in 2010. Each destroyer will carry between 8 (KDX-II) and 16 (KDX-III) of the missiles. The development cost of the program was around US$ 80 million, with a production cost of about $14 million. They were designed in order to combat the potential threat of North Korean submarines.

Hong Sang Eo (Red Shark) Torpedo
Type Anti-submarine missile
Place of origin South Korea
Service history
In service 2010-
Used by Republic of Korea Navy
Production history
Designer Korea Agency for Defense Development (ADD)
Designed 1999-2009
Unit cost 2,000,000,000
Produced 2010-
Weight 820 kg
Length 5.7 m
Width 0.38 m

Engine TVC Rocket Motor
19 km
Speed 45+ knots (83+ km/h)


K745 LW Blue Shark torpedoes

Blue Shark torpedo – Image:

K745 Chung Sang Eo (Blue Shark) torpedo (Hangul: 청상어 어뢰) is a light anti-submarine torpedo developed by the Republic of Korea Navy in 2004. The Blue Shark torpedo can be deployed from surface ships,ASW helicopters and maritime patrol aircraft.

Production history
Designer Korea Agency for Defense Development (ADD)
Designed 1995
Produced 2005-
Weight 280 kg
Length 2.7 m
Width 0.32 m

19 km
Speed 45+ knots (83+ km/h)


Missile batteries

  • VLS: 128 cell
    • Mk 41 VLS 48 cell (Fwd)
    • Mk 41 VLS 32 cell (Aft)
    • K-VLS 48 cell (Aft)


Currently a little larger than the form of the VLS KVLS mounted on the KD-2 and KD-3
If only the hyeonyong KVLS compared with MK.41, new KVLS is comparable to MK.57 mounted on the zoom Walt.
This will not only of the existing cruise missiles for the navy and Korean ASROC Hong Tianlong sharks, to a large degree geotteun presumably missiles than can operate. Source
  • Anti-ship missile launchers: 16


Sejong the Great-class destroyers’ are often compared to the Arleigh Burke and Atago classes because they utilize the AN/SPY-1 multi-function radar, have similar propulsion and capabilities. One notable difference between the Sejong the Great-class ships and Arleigh Burkes is the number of VLS cells. Destroyers of the Sejong the Great class will have a capacity of 128 missiles, as opposed to 96 on the Arleigh Burke class (although ships in the Arleigh Burke class have the capability to quad-pack 4 ESSM missiles into one launch cell, greatly increasing armament) and the Japanese Atago-class destroyers. The Sejong the Great class is thus one of the most heavily armed ships in the world outreached only to the Kirov-class battlecruiser with 352 missiles, or the Ticonderoga class with up to 496 missiles. Another similarity to Arleigh Burke Flight IIA and Atago-class destroyers is the presence of full facilities for two helicopters, a feature missing from earlier Arleigh Burke and Kongō-class destroyers.

Three of these destroyers have, according to South Korean newspaper Chosun Ilbo, the capability to “track and monitor any missile launched from anywhere from the North.” This capability was demonstrated by the tracking of a North Korean missile in April 2009.

Electronic Warfare

LIG Nex1 SLQ-200K Sonata electronic warfare suite

Ship borne EW System (SONATA, SLQ-200(V)1K)

Electronic warfare equipment designed to detect and analyze radio wave signals of radars, missiles and others, identify threatening signals, and transmit jamming signal to respond to such threats simultaneously. Source

4 General Electric LM2500 COGAG

The General Electric LM2500 is an industrial and marine gas turbine produced by GE Aviation. The LM2500 is a derivative of the General Electric CF6 aircraft engine.


The LM2500 is available in 3 different versions:

  • The LM2500 delivers 33,600 shaft horsepower (shp) (25,060 kW) with a thermal efficiency of 37 percent at ISO conditions. When coupled with an electric generator, it delivers 24 MW of electricity at 60 Hz with a thermal efficiency of 36 percent at ISO conditions.
  • The improved, 3rd generation, LM2500+ version of the turbine delivers 40,500 shp (30,200 kW) with a thermal efficiency of 39 percent at ISO conditions. When coupled with an electric generator, it delivers 29 MW of electricity at 60 Hz with a thermal efficiency of 38 percent at ISO conditions.
  • The latest, 4th generation, LM2500+G4 version was introduced in November 2005 and delivers 47,370 shp (35,320 kW) with a thermal efficiency of 39.3 percent at ISO conditions.

LM2500 installations place the engine inside a metal container for sound and heat isolation from the rest of the machinery spaces. This container is very near the size of a standard 40-foot (12 m) intermodal shipping container – but not the same, the engine size very slightly exceeds those dimensions. The air intake ducting may be designed and shaped appropriately for easy removal of the LM2500 from their ships. Source

Hangar for two Super Lynx or S H-60 Seahawk

Super Lynx

S H-60 Seahawk


Hull names

On April 20, 2007, Chief of Naval Operations of the Republic of Korea Navy announced that the lead ship of KDX-III class destroyers will be referred as Sejong the Great. Sejong the Great (Hangul: 세종대왕) is the fourth king of the Joseon Dynasty of Korea. He is credited with the creation of the Korean alphabet, Hangul.


Ships in the class

 Name   Number   Builder   Launched   Commissioned   Decommissioned   Status 
Sejong the Great (Korean: Sejongdaewang) DDG-991 Hyundai Heavy Industries 25 May 2007 22 December 2008 Active
Yulgok Yi I DDG-992 Daewoo Shipbuilding & Marine Engineering 14 November 2008 31 August 2010 Active
Seoae Ryu Seong-ryong DDG-993 Hyundai Heavy Industries 24 March 2011 30 August 2012 Active
Class overview
Operators:  Republic of Korea Navy
Preceded by: Chungmugong Yi Sun-sin class
Cost: $923 million (per ship)
Planned: 6
Completed: 3
Active: 3
General characteristics
Type: Destroyer
  • 8,500 tons standard displacement
  • 11,000 tons full load
Length: 165 m (541 ft 4 in)
Beam: 21.4 m (70 ft 3 in)
Draft: 6.25 m (20 ft 6 in)
Speed: exceeds 30 knots (56 km/h; 35 mph)
Range: 5,500 nautical miles (10,200 km; 6,300 mi)
Complement: 300-400 crew members
Sensors and
processing systems:
  • AN/SPY-1D(V) multi-function radar
  • AN/SPG-62 fire control radar
  • DSQS-21BZ hull mounted sonar
  • MTeQ towed array sonar system
  • Sagem Infrared Search & Track (IRST) system
Electronic warfare
& decoys:
LIG Nex1 SLQ-200K Sonata electronic warfare suite
Aircraft carried: Hangar for two Super Lynx or S H-60 Seahawk, one more on landing pad

Main material source

Note: Info on this ship is scarce

Updated Dec 05, 2016

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