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DD-115 Akizuki in Wakayama
Class overview
Operators	Japan Maritime Self-Defense Force
Preceded by	Takanami class
Succeeded by	Asahi class
Cost	DD115: JPY84.4 billion[1] $893 million (constant 2009 USD)
Built	2009–2012
In commission	2012–present
Planned	4
Completed	4
Active	4
General characteristics
Type	Destroyer
Displacement	5,000 tonnes standard 6,800 tonnes full load
Length	150.5 m (493 ft 9 in)
Beam	18.3 m (60 ft 0 in)
Draft	5.3 m (17 ft 5 in)
Depth	10.9 m (35 ft 9 in)
Propulsion	COGAG, two shafts, four Rolls-Royce Spey SM1C turbines
Speed	30 knots (56 km/h; 35 mph)
Complement	200
Sensors and processing systems	ATECS (advanced technology command system) OYQ-11 ACDS FCS-3A AAW system OQQ-22 ASW system NOLQ-3D EW system OPS-20C surface search radar
Armament	1 × Mk 45 Mod 4 127 mm (5 in)/54 gun 8 × Type 90 Anti-ship missile 2 × 20 mm Phalanx Block1B CIWS 2 × HOS-303 triple 324 mm (12.8 in) torpedo tubes Anti-Torpedo system 32-cell Mk 41 Vertical Launching System: RIM-162 ESSM SAM RUM-139 VL-ASROC (DD 115) Type 07 VL-ASROC (DD 116 to DD 118)
Aircraft carried	1 × SH-60K helicopter

The Akizuki class of destroyers of the Japan Maritime Self-Defense Force is intended to escort the Hyūga-class and Izumo-class helicopter destroyers, and safeguard the other Aegis-capable warships such as the Kongō class and Atago class. The destroyer provides defense against surface, airborne and undersea threats. The class was initially designated as "19DD", referring to a date on the Japanese calendar, specifically the 19th fiscal year of the Heisei period (2007).

The hull structure was based on the one of the Takanami-class destroyers. There are many small improvements, such as cleaner lines to reduce the radar signature and decoys for torpedoes; but the principal changes can be summed up as more powerful engines, sensors, sonar and the indigenous ATECS battle management system that has been called the Japanese AEGIS. The main gas turbine engines are standardized on a higher-powered version of the Rolls-Royce Spey SM1C, in contrast to the combination of Rolls-Royce SM1C and General Electric LM2500 turbines used in the Takanami class.^[2]

The purpose of this class is to shield the Kongō class from air, surface and subsurface threats. Main features of the class include enhanced C4ISR and Anti-Aircraft Warfare (AAW) capability, with an OYQ-11 advanced Combat Direction Sub-system (CDS) and FCS-3A AAW weapon sub-system.^[2]

OYQ-11

This is the first CDS adopting a fully distributed computing architecture to be implemented in general-purpose destroyers of the JMSDF. AN/UYQ-70 workstations form the basic computing platform, with Link 16 datalinks. In addition to the CDS, this class is equipped with SATCOM terminals linked to Superbird satellites, part of the Maritime Operation Force (MOF) system. The MOF system is the operational C4I system used in the fleet of the JMSDF, based on the ILOG architecture and interoperable with other JSDF forces. There are also USC-42 DAMA terminals for GCCS-M, the American counterpart of the MOF system.^[3]

FCS-3A

This is a domestically developed AAW combat system. It consists of two main components, one is a dual-band and multimode active electronically scanned array radar, and the other is the fire-control system. The FCS-3A is the derivative of the FCS-3 of the Hyūga-class helicopter destroyer, changing material of its transmitter-receiver modules from gallium arsenide to gallium nitride and introducing additional Local Area Defense (LAD) capability. An ESSM SAM VLS is integrated with the FCS-3A.^[4]

Anti-submarine and Electronic Warfare (EW) capabilities of the Akizuki class have been enhanced, with a new OQQ-22 integrated sonar suite sub-system (hull-sonar and OQR-3 towed array; - a Japanese equivalent of the American AN/SQQ-89), and the NOLQ-3D digitalized EW suite sub-system. These sub-systems communicate across a NOYQ-1B wide area network. These systems are comparable to those of the Zumwalt-class destroyer.^[3]

• 
  Starboard view JS Akizuki
• 
  Bow view
• 
  Bridge detail with 2 AESA arrays
• 
  JS Teruzuki at Yokosuka naval base, 2013
• 
  JS Teruzuki (DD-116) and JS Suzutuki (DD-117) at Nagasaki shipyard

• Ministry of Defense 平成18年度　事前の事業評価 (2006 Prior enterprise evaluation) (Japanese)
  • Summary
  • Reference
  • Prior evaluation note