KDDX - medium destroyer
KDDX-class Guided Missile Destroyer is a Korean Mini Aegis ship. The Aegis destroyer ship costs about 1.2 trillion won. Adding the armed cost and the operation cost, the amount is much higher. For the Navy, the performance of an Aegis destroyer is needed, but it is inevitable that KDDX, which is lower in cost and operating expenses, is needed. Moreover, Korea has enough capacity to build KDDX now that it has localized both the fleet, naval base, and ship-to-air missiles and vertical launchers.
Since it is only in the stage of thinking only, concrete performance or arming is not confirmed. However, it is certain to have a multi-function phased array radar (AESA) and a long-range air defense missile capable of intercepting ballistic missiles. The navy says it is possible to do localization because of the accumulated domestic technology.
The KDDX-class destroyer (KDX-IV) is a stealthy destroyer class under development by Daewoo Shipbuilding & Marine Engineering for the Republic of Korea Navy, to be launched after 2025. The maneuvering fleet would consist of three maneuverable fronts consists of three Aegis destroyers (7600t class) and KDDX (mini-Aegis ship) (6000t class), which were built in the early 2020s.
The KDDX, which will be built in the mid-2020s, is armed with anti-aircraft missiles and land-attack missiles. The KDDX is larger than the KDX-II, which is currently being operated, but it is smaller than the 7600t Aegis destroyer (KDX-III), which is the main power of the naval maneuvering unit.
The Navy said it is considering "implementing a maritime-based Korean 3-axis system (kill chain, Korean-style missile defense, mass retaliation)" and said, "The ability to strike key targets within the North Korean Command and the North Korean Ballistic Missile Operations Area (BMOA) will enhance the land attack capability and the anti-submarine performance capability. "
It is expected that the mounted VLS will be equipped with a large-sized KVLS. This vertical launcher has an area of 180%, a cell length of 120% and an armload weight of 185% compared with the conventional KVLS. The flame treatment capacity is expected to increase significantly. If the existing KVLS is similar to Mk.41, KVLS-II is assumed to be similar to Mk.57. K-SAAM, which is expected to be installed as a quad-pack in one cell, will be equipped with L-SAM.
The most noteworthy feature of KDDX is that it has the first stealth integrated radar in Korean Navy history. First of all, integrated mast. The integrated mast is a system that modularizes various radar systems on the bridge and puts them into the electromagnetic shielding structure. The integrated mast looks like a watchtower. It can be said that the tower is placed on the bridge. The integrated mast greatly reduces the radar reflection area index (RCS) of the ship.
The phased array radar is also noteworthy. It is said to be equipped with a side-by-side AESA radar using GaN (gallium nitride) material using the same S-band as MFR of L-SAM. The detection range is expected to be about 400 ~ 450km in comparison with the deployment time, size, band characteristics, etc., that the radar installed in Japan's Akizuki class is more than 450km in the C band and more than 150km in the X band.
Like AN / SPY-1, which is the Aegis destroyer's radar, AESA is fixed on four sides. The surface array radar can detect all directions 360 degrees without interruption. The rotating radar misses the enemy on the radar for a period of time until the antenna returns to its original position. Long-range air-to-surface missiles are likely to adopt the L-SAM sea-type missile, a long-range surface-to-air missile. If the L-SAM program faces problems, the SM-3 may be used.
The Agency for Defense Development is also developing infrared shielding paints to be used for receiving surveillance. Recent anti-ship missiles have infrared seekers. So if the ship has infrared shielding paint, it can defeat enemy anti-ship missiles. KDDX's radar uses low-level detection (LPI) technology that reduces the output to a minimum when detecting enemies, or randomly changes the frequency and waveform of the radar. This prevents the enemy from identifying the radar transmission signal, making it difficult to locate the ship.
On 22 October 2019, the biennial Korea International Maritime Defense Industry Exhibition opened in Busan, the naval center of South Korea. This Korea International Maritime Defense Industry Exhibition attracted defense companies from more than 100 countries and regions all over the world. Of course, As a showcase for the Korean shipbuilding industry, most of them are Korean companies. At present, the South Korean Navy has proposed an ambitious iterative plan for its new navy ship, and these concepts were also unveiled for the first time at this exhibition. At the same time, the South Korean shipbuilding industry attaches great importance to the ship's export industry, and many new concepts of export ships have appeared in this exhibition.
One highlight at this exhibition was South Korea’s “KDDX” next-generation domestic destroyer plan . The “KDDX” was positioned by South Korea as “domestic, brand new, equipped with "International-class universal destroyer" is used to replace the KDX-I "Kwanggaeto" class and the KDX-II "Choong Moo Gong" class destroyers, suplementing the major destroyer KDX-III "Sejong" currently serving in the Korean Navy. The KDX-III is high cost because of its large number of American designs.
The latest KDDX's basic parameter configuration is not very different from previous reports. It has a total length of 155 meters, a side width of 18 meters, a draught of 9.5 meters, a displacement of about 8,000 tons, equipped with front 48 vertical launch cells, rear 16 vertical cells, and radar array. All are integrated in the mast above the bridge. The mast array style has a larger gap than that disclosed in the previous article, but it is still a derivative version of the European Thales "I-MAST" mast independently developed by Hanwha Group. Layer design integrates "S + X" dual-band radar array.
KDDX's contractor, Korea Daewoo Shipbuilding & Ocean Engineering, exhibited four different ship designs of "KDDX" at this exhibition: "conventional", "vertical penetrating bow", "vertical penetrating bow" and "three-body". These four designs have been considered by the US Navy ’s “Zumwalt” class destroyers. Among them, the “conventional” bow is currently the most common flying shear bow, and the “Wave- piercing Tumblehome Monohull" is the final design of the current Zumwalt class destroyer. Compared with the conventional traditional bow design, it is inclined from bottom to top and outwards. The "wave piercing bow type" is just the opposite. It is tilted from top to bottom. The sharp bow can cut through the waves and obtain a larger ship. The underwater volume reduces the wave-making resistance, which brings better speed and horizontal and vertical restoration moment of the hull. But the disadvantages are that the space on the waterline is narrower, the reserve buoyancy is lower, and the ship ’s head is in severe sea conditions. Leaning forward and being buried by the waves intensified.
Following basic planning and a review of the military's requirements, the Defense Acquisition Program Administration (DAPA) on 29 May 2020 issued a bid notice to select an entity in charge of the designing. After completing the design by the second half of 2023, DAPA was planning to begin its construction in 2024, according to its officials. Construction of the first in the new class of ships was expected to start in 2024, once the design work wraps up, tentatively by the second half of 2023. The first vessel ess expected to be built by the late 2020s at a cost of around $1.57 billion.
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