ROKS Dokdo (LPH 6111) is the Landing Platform Helicopter (LPH) of the Republic of Korea Navy (ROKN). The LPH was built by Hanjin Heavy Industries and Construction in Busan. The ship was named after the Dokdo islets in the East Sea.
The lead ship in its class, ROKS Dokdo (LPH 6111), was launched in July 2005 and commissioned into the ROKN in July 2007. The ROKN also planned to deploy two similar ships intended for strategic mobile units. The second and third units will be named Marado (LPH 6112) and Baengnyeong (LPH 6113).
ROKS Dokdo (LPH-6111) sails alongside amphibious assault ship USS Bonhomme Richard (LHD 6) and other ships of the Bonhomme Richard Amphibious Ready Group and ROK Navy during exercise Ssang Yong. (U.S. Navy/MC2 Michael Achterling)
Ships in the class
|ROKS Dokdo||LPH-6111||Hanjin Heavy Industries||12 July 2005||3 July 2007||Active|
|ROKS Marado||LPH-6112||Hanjin Heavy Industries||April 2018||2020||Under Construction|
Dokdo LPH acts as a command and control platform for the maritime mobile fleet and supports three-dimensional landing operations as well as maritime air operations. It can also be deployed in a range of operations including in support of national overseas policy, peacekeeping operations, disaster recovery, counter-terrorism operations and national prestige enhancement.
Dokdo is the largest vessel in the South Korean Navy. It has almost similar specifications compared to the Spanish Navy’s aircraft carrier Príncipe de Asturias and the Thai Navy’s Chakri Naruebet light aircraft carrier.
Príncipe de Asturias: Details
H.T.M.S. Chakri Naruebet: Details
Design and features
The hull is divided into four decks to accommodate helicopters, assault amphibious vehicles (AAV), landing craft air cushion (LCAC), tanks and trucks. Accommodation facilities, command posts and crew life support systems are located on deck 2.
Developed based on the concept of over-the-horizon assaults, Dokdo can conduct amphibious landing operations with high-speed LCAC and helicopters from beyond the horizon.
The ship’s combat data system manages and controls onboard weapons and allows the ship to command support vessels and aircraft in the strategic mobile operation fleet.
The ship has an overall length of 199m, a width of 31m and a draught of 7m. The standard displacement of the vessel is 14,000t and full load displacement is 18,000t. The LPH can carry over 700 marines, 10 trucks, six tanks, six AAVs, three field artillery pieces, 10 helicopters and two LCACs. Dokdo can complement more than 330 crew members.
The flight deck can accommodate five UH-60 Black Hawk helicopters at a time. The aircraft hangar facility is provided for UH-60 helicopter and the AH-1 attack helicopter. The aeroplane shed on the lower deck is a multi-layer structure equipped with elevators.
The flight deck is covered with Urethane to withstand the heat created by the aircraft during operations.
The ship can operate short-range and VTOL (vertical take-off and landing) aircraft such as the Harrier or F-35B, when equipped with a ski jump board module.
S. Korea’s military mulls operating F-35B stealth aircraft aboard new amphibious assault ship: Here
South Korea’s military has begun to consider operating F-35B stealth aircraft from its newest amphibious landing ship slated to be deployed in 2020, as part of efforts to strengthen its naval power, sources said Monday.
The authorities have recently discussed whether the second 14,000-ton Dokdo-class vessel can carry the F-35B fighter, a short takeoff and vertical landing variant of the U.S.-made fifth-generation warplane.
“I understand that the military top brass have recently discussed whether they can introduce a small number of F-35B fighters and operate them aboard the new ship that has already been deployed and one to be additionally built,” a military source told Yonhap News Agency, declining to be named.
The LPH is armed with RIM-116 RAM (rolling airframe missile) system. RAM is an infrared homing surface-to-air missile used against anti-ship cruise missiles.
The missile can travel at a maximum speed of Mach 2 while carrying a blast fragmentation warhead for a range of 9km. The ship is also fitted with two goalkeeper close-in weapon systems (CIWS) supplied by Thales Nederland. The system provides close-point defence against incoming missiles and ballistic shells. The seven barrelled CIWS can fire 4,200 rounds a minute for a maximum range of 2,000m.
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 fas.org
Goalkeeper close-in weapon systems (CIWS)
The system automatically performs the entire process from surveillance and detection to destruction, including selection of the next priority target. The crucial importance of a last-ditch defence system has been proven on numerous occasions. To provide for this need, Thales developed Goalkeeper, an extremely effective system, that incorporates the 30 mm, 7-barrel Gatling gun with special missile-piercing ammunition. The combination of MPDS ammunition and a firing rate of 4200 rds/min gives the system the power necessary to destroy missile warheads.
Goalkeeper provides excellent performance against surface targets. Search and track radars, weapon control and integration of the total system are Thales’ strengths. A high detection probability for small targets is ensured in all weather conditions by the use of an I-band search radar. Pin-point target tracking is achieved by the dual frequency I/K-band track radar. Continuous search with track-while-scan ensures rapid engagement of the next priority target in multitarget scenarios.
Goalkeeper’s capabilities have been proven many times during sea-going trials. U.S. trials in which 3 types of live missiles were destroyed by Goalkeeper, conclusively confirmed the capabilities of this proven Close-In Weapon System.
Goalkeeper is operational in the navies of Belgium, Chile, the Netherlands, Portugal, Qatar, South Korea, the UAE and the UK.
The ship’s long range volume search radar is the Thales SMART-L. The radar can detect and track targets within the range of 400km. The ship is also equipped with MW08 surface search radar and AN/SPS-95K navigation radar.
• Multibeam architecture
• Pulse-Doppler processing over complete coverage
• Wide Elevation coverage
• One single mode
• Fast reaction capability
• Mission selectable illumination patterns
• Simultaneous air- and surface surveillance channel
• Long range air surveillance:
– Build-up of recognised air picture
– Fighter direction
– Non-Cooperative Target Recognition
– Local ATC
• Surface surveillance up to radar horizon
• Passive Jamming surveillance.
• Ballistic Missile Defense support
• Military Patrol Aircraft : ~400 km
• Stealth missile : ~65 km
• Range (air) : 400km
• Elevation : 70°
• Capacity : >1000 tracks
• Polarisation : Vertical
• Horizontal beamwidth : 2.2°
• Update rate : 5 seconds
• Electronic stabilisation
• Very low sidelobes
• Integrated IFF Antenna
• Maintenance from inside the antenna
• Frequency : D-band
• Solid State
• Digital beamforming
• Multipath suppression using beams under the horizon
• Doppler FFT processing including radial speed determination
• Cluttermap and jamming map
• Least jammed frequency operation
• Multiple hypothesis tracking
• 2 km against RHIB
• 7 km against FPB
MW08 surface search radar
|Type||3D Air/Surface Search|
|Range||0.1m2 target: 17 km
1m2 target: 27 km
2m2 target: 32 km
In bearing: 20
In range: 90 m
Tracking accuracy In bearing: 0.250
In range: 40 m
In elevation: 1.20
Tracking capacity Air targets: 20 (basic configuration)
Surface targets: 8 (basic configuration)Surface targets: 2 (gun-fire accuracy control)
|Power||50 kW (Peak)|
AN/SPS-95K navigation radar
SPS-95K is a lightweight, G-Band low-volume surface search and navigation radar suitable for installation aboard destroyers, frigates and corvettes. The equipment comprises an antenna, transceiver and a remote control unit and is described as making extensive use of solid-state technology. Electronic counter-countermeasures provision includes pulse repetition frequency jitter, sector radiation, sensitivity time control, fast time constant, automatic/manual gain and frequency control, pulse interference suppression and constant false alarm rate. Available interfaces comprise video (four outputs), indicator trigger (two), Identification Friend-or-Foe (IFF) trigger (two outputs – SPS-95K incorporates an integral IFF capability), blanking trigger (two), antenna turning signal and gyro.
|frequency:||5.45 … 5.825 GHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||2 400 Hz or 1 200 Hz or 750 Hz|
|pulsewidth (τ):||0.12 µs or 0.25 µs or 1 µs|
|peak power:||250 kW|
|instrumented range:||200 km|
|hits per scan:|
Electronic warfare & decoys
SLQ-200(v)5K SONATA on the ROKS Dae Jo Yeong (DDH-977) at JMSDF Yokosuka Base, Japan (2015 Oct 17). by yasu_osugi
|Type: ESM||Altitude Max: 0 m|
|Range Max: 926 km||Altitude Min: 0 m|
|Range Min: 0 km||Generation: Late 1980s|
|Sensors / EW:|
|K/SLQ-200(V)K Sonata [ESM] – (Argo Phoenix mod, AR-700A) ESM
Max Range: 926 km
DAGAIE Mk2 LEM Chaff
|Type: Decoy (Expendable)||Weight: 0 kg|
|Length: 0.0 m||Span: 0.0 m|
|Diameter: 0.0||Generation: Not Applicable (N/A)|
|Targets: Surface Vessel|
|DAGAIE Mk2 LEM Chaff – Decoy (Expendable)
Surface Max: 1.9 km.
Dokdo’s propulsion system is based on combined diesel and diesel (CODAD) plant. The propulsion system integrates four S.E.M.T. Pielstick 16 PC2.5 STC diesel engines. These engines were licence built in Korea by Doosan Heavy Industries and Construction.
Each engine, rated at 7,650kW, is equipped with sequential turbo charging (STC) system. The CAE Integrated Platform Management System (IPMS) monitors and controls the hull, propulsion, electrical distribution, steering and battle damage control systems. The propulsion system provides a maximum speed of 23kt and cruising range of 10,000nm at 18kt speed.
4 x S.E.M.T. Pielstick 16 PC2.5 STC diesel engines
S.E.M.T. Pielstick 16 PC2.5 STC diesel engine – fairbanksmorse.comS.E.M.T. Pielstick 16 PC2.5 STC diesel engine – fairbanksmorse.com
|Type:||Landing Platform Helicopter|
|Displacement:||14,300 tons (empty) / 18,800 tons (full)|
|Length:||199 m (653 ft)|
|Beam:||31 m (102 ft)|
|Draught:||7 m (23 ft)|
|Boats & landing
|2 LCAC (LSF-II)|
|Capacity:||Up to 200 vehicles (Including Tanks)|
|SMART-L air search radar, MW08 surface search radar, AN/SPS-95K navigation radar, TACAN, VAMPIR-MB optronic sight|
|ESM/ECM:SLQ-200(v)5K SONATA, Chaff launcher|
|Aviation facilities:||Flight deck with 5 landing spots and hangar|
Main material source naval-technology.com