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Asahi-class 25DD Multipurpose Destroyer - Armament

Mk-41 vertical launcher system

The weapon system of the ship is equipped with a vertical launcher system of 32 Mk-41 mod 29 launchers for non-close-range naval missile RIM 162 ESSM and Type-07 VL ASROC anti-submarine missiles. The 32 launchers are divided into 4 clusters, each with 8 launchers in a box shape. The missile fire according to the "hot launch" principle (hot launch type means the rocket engine is activated as soon as in the launch tube).

One of the important requirements of the Japanese Military Doctrine is to establish a line defense system (air defense / anti-grounding) for combat areas of ships carrying out missile defense missions. JMSDF leaders understand the threat both from low-altitude missiles and modern submarines. Therefore, in parallel with the construction of destroyers with many modern defense capabilities, Japan also built helicopters able to maneuver anti-submarine sensros. In fact few people know that in the field of underwater combat, JMSDF has occupied the top position in the world for a long time, and JMSDF has also caught up with the US Navy in many other areas. The JMSDF operates about 30 warships carrying missile weapons. And although it seems that Japan owns many different types of destroyers, all of the combat groups, systems and equipment have been standardized.

The Japanese naval ship's forces are said to only perform pure defensive functions. Although there is a certain volume of Japanese-made Type 90 SSM-1B anti-ship missiles, Japanese destroyers do not carry offensive weapons - such as long-range anti-ship missiles. This is due to Article 9 of the Japanese Constitution prohibiting the manufacture of similar systems. In addition, there is a principle that is also being applied - the task of attacking is the "privilege" of submarines and air force.

The Type 90 SSM-1B anti-ship missile was developed by MHI in 1988 and put into service in 1992. Type 90 is a flagship version of the Type-88 coastal defense system. The Type 90 has an aerodynamic design that blends American RGM-84 Harpoon anti-ship missiles and French Exocet. The missile has four large stable fins that are triangular near the middle of the chain body behind it (this wingspan is larger than Harpoon and Exocet) and four small triangular fins on the missile tail. Type 90 has a length of 5.1m, a diameter of 0.35m, a wingspan of 1.19m, a weight of 660 kg. The missile has a range of 200 km and carries a warhead weighing 225 kg, the missile's cruise speed is about 1,150 km / h. When operating, missiles are removed from the launch tube with a solid fuel booster engine. After the engine intensifies, the Mitsubishi TJM-2 turbojet engine will be activated to bring the cruise missile to the target. For high flexibility and increased survivability for system-propelled system rockets have been integrated.

The missile is guided in combination with inertial guidance in the early and middle stages, the last phase of the missile uses active radar to find and identify targets. If the target is not found within a period of time, the missile will cancel or receive a self-destruct command. Type-90 can fly at extremely low altitudes and is able to fly around obstacles to reach the target location. When flying at the stage of checking the realm, it flew 15m from the sea surface, at the last stage when approaching the target, it was only 2-3m away from the sea surface, so low flying would completely "blind" the system.

The explosive warhead of the Type 90 warhead is a "semi-armor" type. First, relying on the kinetic energy when flying, the warhead can penetrate the enemy ship, the rocket's warhead can pierce the enemy ship. After a few seconds penetrating into the ship, the rocket will explode. leading to an explosion, thereby blowing up the warhead containing the powerful explosives right in the ship's hull, plus the unburnt fuel of the missile launched along the explosion, causing the whole ship to burn, making ships heavily destroyed. The hole diameter can be up to 10m wide. This type of missile can operate in all weather conditions and has high anti-interference ability, if it finds noise, the electronic system will take anti-interference steps and if it is not effective it will switch mode radar from active to passive detects the source of interference. In this mode it will prioritize to kill the source of the previous interference so that the following missiles can detect the target to kill. Active-type radar self-regulating heads can manually adjust the line of sight to hit the target in the +30o angle plane, leading the missile to the strongest concentration of reflected waves from the target hull.

Sea-air missile RIM-162 ESSM

The RIM-162 ESSM non-naval missile was developed by Raytheon Corporation (USA) in cooperation with 10 European countries based on the non-RIM-7 Sea Sparrow sea-rocket missile since the late 1990s. RIM-162 is a system short-range air defense missile systems - mid-range multi-objective combat, in all weather conditions, designed to engage in air defense missions on ships, destroy fighters, helicopters and vehicles enemy's drone. In addition, an important feature of RIM-162 is that this system has a very high defensive ability when operating in a fleet's combat squad. All threats such as anti-ship missiles, cruise missiles, smart bombs, etc are intercept targets of RIM-162.

The RIM-162 rocket has a fairly compact structure and consists of 4 parts: the top is the active Doppler radar detector with a protective tip at the top operating on a band of 10 GHz to 20 GHz; the second part is a 39 kg (HE) fragmentation explosive warhead with close contact radio detonator; the third part is the solid fuel engine Mk-134 mod 0 which helps RIM-162 to reach speeds of up to Mach 4; The final part is the missile tail used to keep the missile stable, the upper part of the tail is installed with four detachable four-wing navigators and four stabilized wings mounted near the center of the body. This design was introduced to help control missiles better in high-speed conditions. RIM-162 has a mass of 280 kg, a length of 3.66 m; diameter of 0.252 m; the range is 20 km with the goal of low-flying cruise missiles and up to 50 km with large targets such as fighters, the maximum range is 9 km.

Target identification will be loaded into the rocket before launch, with identification data that can be provided by radar or optical observation systems. After being launched vertically, RIM-162 was led by independent inertia in the first stage according to the information provided earlier, at the second stage the missile continuously updated target data information from the ship launched through the channel. link to correct flight routes and in the final stage it will activate active radar to determine the target ("shoot and forget" method). The electronic system will adjust the radar frequency jump if there is any interference and if the target is not found within a period of time, the missile will cancel or receive self-destruct commands.

Anti-submarine missiles Type-07 VL-ASROC

Type-07 VL-ASROC anti-submarine missiles are manufactured in Japan on the basis of American RUM-139 VL-ASROC anti-submarine missiles. Type-07 VL-ASROC is a two-story anti-submarine anti-submarine engine rocket, the first stage motor is a high-speed acceleration motor, the second-stage engine is a solid fuel cruise. Type-07 VL-ASROC has a length of 4.5m, a diameter of 0.38m, a weight of 820 kg and a range of 28 km. The rocket carries a light anti-submarine torpedo Mk-46.

When there is information to detect the coordinates of the operating area of the enemy submarine from the radar system, the information and data on the target coordinates, the trajectory trajectory will be transmitted to the control computer system of ship. From the console, soldiers will carry out missile preparation operations, load target data into missile computer memory and rocket launchers. Inertial navigation system is used when flying to reach the target's location in the database. In a predetermined position on the trajectory trajectory, torpedoes will separate themselves from the missiles and fall into the sea by braking. This will help minimize the sound when falling into the water. After the parachute cut, the torpedo activates the self-guided part to perform the target search and attack operation. The strength of this rocket is to use the rocket's high speed to quickly destroy the submarine when it is detected. Type-07 VL-ASROC often uses multiple missile firing mechanism towards submarine area so the probability of destroying the target is very high. In addition, it also has the ability to self-destruct after a while if the target is not found.

127 mm Mk-45 Mod 4 gun

The ship's main gun, the 127 mm Mk-45 mod 4 gun, has a barrel length 62 times the of the diameter. It is produced by Japan Steel Works Company under the license of BAE System, UK. The Mk-45 mod 4 is the lightest, most compact automatic gun in the world today, and is also the most widely deployed with more than 260 systems supplied to the US Federal Navy (US Navy) and Navy more than 10 other countries worldwide.

The angled gun can significantly reduce the radar reflected area thereby improving the stealth capability of the ship. Mk-45 mod 4 has a weight of 28.9 tons, uses a 7.87m gun barrel (shot life of 7,000 shots), firing rate of 16-20 rounds/minute. It has effective range from 45 - 50 km with extreme accuracy due to Excalibur N5 precision ammunition - capable of navigating by GPS. Accordingly, with the standard Mk 45 standard ammunition only reaches a range of 15-16 km, causing the JMSDF ships to spend a lot of ammo to destroy the target, but when equipped with Excalibur N5, the range is increased 3 times, while helping the ship to increase the combat area from 370km2 to 3,704km2. The fast firing speed along with the ability to fire many special shells makes Mk-45 mod 4 suitable for many roles such as attacking enemy warships on the water.

The Mk-45 mod 4 can fire four different types of ammunition including armor type, fire, direct slashes and can even be guided to destroy anti-ship missiles. Accordingly, TanSo-ho is equipped with 4 relay tubes and is fully controlled automatically by high-speed computer system. Each bullet relay contains up to 14 bullets always ready to fire. In addition, the cannon can be reloaded while the gun is still firing, the reload time between each shot is less than 1 minute. The shooting and adjustment of the gun barrel angle is controlled through automatic electronic systems, while the hydraulic-controlled loading system. The cannon's ammunition can carry up to 680 artillery shells for long-term operation.

Close-range air defense system (CIWS) Mk-15 Phalanx

The ship's close-range anti-aircraft firepower ( CIWS ) is the Mk-15 Phalanx system. The Mk-15 Phalanx is an integrated closed system consisting of guns, bullets and radars mounted on a single platform. System developed by Pomona Branch of General Dynamics (now belonging to Raytheon Group) in the late 1960s. The first test system in 1973, began mass production in 1978, until 1980 was commissioned. into equipment. The Phalanx system consists of a 20mm-caliber Gatling M61A1 Vulcan 20mm caliber cannon and a radar operating on the K-band. Under combat conditions, the radar will scan the sky, identify targets and filter out the most dangerous targets. After identifying the target, the fire control radar will accurately calculate the enemy's position for the Gatling M61A1 Vulcan 6-gun fire. Radar of Phalanx CIWS system is built according to closed-point technology, capable of detecting aircraft from 18 km distance, cruise missiles with radar reflecting area of 0.1 m from 12 km distance and clinging to within 5 km.

The Gatling M61A1 Vulcan is electrically controlled, with a very high rate of fire, up to 4,500 rounds per minute, an effective range of 1,000 - 1,500 m, while a maximum range of 3,000 m. The Gatling M61A1 Vulcan shoots very fast, so the reload had to be done by hand. It would take 2 people to replace the ammo, taking about 5 minutes. Two bullet boxes arranged on the side of the cannon have a capacity of 500 rounds per box, depending on the target of air or ground, the cannon will fire explosive bullets or penetrating armor - usually 1 box of bullets containing bullets exploding while the other box carries armor-piercing bullets. A 20 mm self-destructing shell armor (APDS) of Mk-15 uses a 15 mm piercing head with heavy metal (tungsten or poor uranium) surrounded by a plastic bullet and a light metal bottom. The shell after firing will be ejected from the lower part of the cannon in the forward direction. Operating fully automatically under human supervision, Phalanx CIWS can destroy targets at a distance of 3.6 km. In some operating conditions, the Phalanx CIWS system can also shoot down targets on the water, including enemy ships.

324mm HOS-303 torpedo tube

Asahi class destroyers are equipped with two torpedo launchers with 324mm HOS-303 using Mk-46 torpedoes. The HOS-303 is a version of the US-produced Mk 32 launch system, capable of firing American standard Mk-44/46/50/54 torpedoes. The launch system is designed to be capable of rotating, navigating and shooting from a distance (shooting alone can be done manually in place) aimed at the target to be destroyed. The tube is made of fiberglass or metal material, inside the tube is covered with a layer of glass fiber to preserve torpedoes in the harsh weather conditions of Japan.

The Mk-46 torpedo program was started in 1960 to replace the obsolete Mk-44 torpedo. The Mk-46 torpedo was officially put into service in 1967. Mk-46 torpedoes have a shell made of aluminum alloy, a length of 2,591m, a diameter of 0.324m, a weight of 230.4 kg, a travel speed of 45 nautical mile (83.4 km / h) range of 11 km, 455m deep diving ability, active waterway navigation system - passive, PBXN-103 43.1 kg explosive warhead, contact explosion, Electric water jet engines minimize noise. Power source is provided by battery system of zinc - silver battery (power supply for electric motors with a capacity of 35 horsepower). Mk-46 is equipped with 2 contra-rotating propellers.

The Mk-46 torpedo is launched without reloading by compressed air in the two gunpowder containers. After the launch, the torpedo is released by plunging into the water. After that, the Mk-46 began searching for targets and maneuvering on a spiral. The guidance system is capable of detecting targets at distances up to 595m. After discovering the target, torpedoes began rushing to the target at a very fast speed. In the case of an unsuccessful attack, the navigation system allows the attack to resume. In addition, the ship can also use other types of torpedoes such as Mk-50 , Mk-54 or Type 73 (equivalent to Mk-46) developed by Japan.

ASW helicopter

The stern has a flight deck and a container house that allows to carry two SH-60J Sea Hawk anti-submarine helicopters, but it is actually only possible to carry one aircraft during voyages. The ship is also equipped with maintenance equipment and essential parts for helicopters. SH-60J Sea Hawk is manufactured by Mitsubishi Heavy Industries under license of Sikorsky Aircraft Company (USA). This aircraft is a modified version of the underground hunting helicopter SH-60B Sea Hawk serving in the US Navy. The SH-60J was officially put into operation into JMSDF service in August 1991. By 2005, there were 103 SH-60Js shipped.

The SH-60J can fly up to 100 miles from the mother ship and remains on the base for several hours. The aircraft performs realms, searches and rescues, targets targets for missiles, battleships, submarines and all-weather raid. The SH-60J is equipped with AN / APS-124 search and navigation radar systems provided by Raytheon Corporation, AN / ARN-118 (V) tactical aerial navigation system of Rockwell Collins Company, radar ANP / ANN APN-127 pulse from Teledyne Ryan, AN / ARA-50 UHF navigation system of Rockwell Collins Company, AN / APR-194 (V) high-altitude radar from Honeywell Company, the system spreads a negative signal buoy bar discovered Sikorsky submarine, AN / ARR-84 receiver, AN / UYS-1 sound signal processor and AN / ARN-146 locator used to indicate the position above the submarine in the dive.

In addition, the SH-60J is equipped with AN / ALQ-14 electronic support device, AN / ALQ-144 infra-red machine from BAE Systems Group, AN / ALE metal flares and flares from Lockheed Martin Group, AN / AAR-47 missile warning machines from Alliant Techsystems and infrared devices seeking ahead of AN / AAS-38 from Lockheed Martin Group. Four hardpoints of aircraft can be fitted with Mk-46 light torpedoes, anti-submarine bombs and AGM-114M Hellfire II non-marine missiles . The adherence to the target uses the thermal imaging detector AAS-44 with the laser target detector. The SH-60J is also equipped with a 7.62mm Type 74 machine gun.

The SH-60J has a main rotor and four-leaf tail rotor made of composite, with two Ishikawa-Harima T700-IHI-401C shaft drive engines (manufactured by General Electric license) with a capacity of 3,400 horsepower side by side on top of the cabin with an air intake at the side of the fan base and exhaust holes on the rear of the platform. The aircraft has a range of more than 800 km, with a maximum speed of 270 km / h. The internal fuel tanks of the SH-60J contain 2,250 liters. The aircraft can be used as an aerial refueling system. SH-60J can carry over 1,800 kg of goods inside. Outside hangers can carry up to 2,725 kg of cargo.

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