Mogami-class frigate

Mogami-class frigate
Name	Mogami-class frigate
Builders	Mitsubishi Heavy Industries, Japan Marine United, Kawasaki Heavy Industries
Built range	2019–present
In service	2021–present
Total units	4–12 (planned)
Ship class	Frigate
Length	130 m
Beam	16 m
Displacement	5,500 t (full load)
Propulsion	COGLAG (gas turbines, electric motors)
Speed	30+ kn
Range	5,000 nmi
Complement	90–120
Sensors	Thales Nederland SMART-L, NEC OYQ-XXX combat system
Missiles	Type 17, RIM-162 ESSM

Mogami-class frigate is a class of modern multi-role surface combatants built for the Japan Maritime Self-Defense Force (JMSDF) to replace older Asagiri-class destroyer and Abukuma-class destroyer escort units. Designed for anti-submarine warfare (ASW), anti-air warfare (AAW), and anti-surface warfare (ASuW), the class emphasizes stealth, modularity and automation to operate alongside Izumo-class helicopter carriers, Kongo-class destroyer, and future Universal Combat Ship concepts. Development reflects lessons from operations involving the United States Navy, Royal Navy, Australian Defence Force, and regional security trends including incidents in the East China Sea, South China Sea and maritime disputes around the Senkaku Islands.

Design and development

Design work began under programs overseen by the Japan Ministry of Defense and technical guidance from the Acquisition, Technology & Logistics Agency (ATLA). Lead contractors included Mitsubishi Heavy Industries, Japan Marine United, and Kawasaki Heavy Industries, with systems integration by Mitsubishi Electric and NEC Corporation. Influence from allied programs—such as the Royal Netherlands Navy's integration of Thales systems, the U.S. Navy's Littoral Combat Ship discussions, and lessons from the Korean Navy frigate projects—shaped choices in propulsion (COGLAG), hull form, and modular mission bays compatible with packages used by NATO partners. The design targets reduced radar cross-section informed by studies involving MAST Systems and acoustic quieting techniques derived from Yokosuka Naval Arsenal research. Political drivers included parliamentary debates in the National Diet, procurement reviews by the Ministry of Finance (Japan), and strategic guidance in the National Security Strategy (Japan).

Specifications

The hull displaces approximately 5,000–5,500 tonnes full load, with an overall length near 130 metres and beam about 16 metres to accommodate a large flight deck and twin hangars for SH-60K Seahawk or future F-35B-related unmanned rotorcraft. Propulsion uses COGLAG combining General Electric gas turbines and electric-drive motors, enabling speeds exceeding 30 knots and a range near 5,000 nautical miles at economical speed—requirements influenced by operational demands in the Indian Ocean and Pacific Ocean. Survivability features include automated damage control systems from Fujitsu-sourced subsystems, double-redundant power distribution, and signature reduction measures pioneered in collaboration with METI-sponsored research labs.

Armament and sensors

Primary armament centers on a 16-cell Mk 41 vertical launch system compatible with RIM-162 ESSM and Japan's indigenous Type 03 (Sea Sparrow) derivative, and a 12–16 cell aft launcher for anti-ship missiles such as Type 12 (SSM-1B) or export-configured variants. A medium-calibre gun (127 mm) by Japan Steel Works provides naval gunfire support, while close-in defense is afforded by a combination of phased-array radars from Thales Nederland (SMART-L or SeaMaster derivatives) and close-in weapon systems influenced by the Phalanx CIWS family. ASW suite integrates low-frequency towed arrays from Thales Underwater Systems, hull-mounted sonar by Kongsberg-licensed manufacturers, and ASW torpedoes such as the Type 97 (G-RX4) lightweight torpedo launched from triple tubes. Electronic warfare and decoy systems developed with NEC and Mitsubishi Electric provide soft-kill measures, linked to an advanced combat management system derived from the JMSDF OYQ-9x line.

Construction and career

Keel-laying and construction occurred at major Japanese yards including Kawasaki Shipyard (Kobe), Mitsubishi Heavy Industries Nagasaki Shipyard, and Japan Marine United facilities in Kure. Commissioning of lead units took place in the early 2020s with naming conventions honoring historical waterways and naval traditions of Japan, reflective of earlier classes such as the Mogami (light cruiser) legacy. Early career activities included integration trials with JMSDF squadrons, live-fire exercises with the United States Navy around Guam and Hawaii, and participation in multilateral drills such as RIMPAC and bilateral exercises with the Royal Australian Navy and Indian Navy.

Operators and deployments

Primary operator is the Japan Maritime Self-Defense Force, with squadrons posted to major homeports including Yokosuka Naval Base, Kure Naval Base, and Sasebo. Deployments emphasize maritime domain awareness and collective security, participating in anti-piracy patrols off Somalia alongside ships from the European Union Naval Force and escort duties in the Malacca Strait convening with the Indian Navy and Royal Navy. The class has also conducted freedom of navigation operations near contested features in coordination with United States Indo-Pacific Command and intelligence-sharing partners such as Five Eyes members during multinational task group deployments.

Modernization and upgrades

Planned upgrades focus on enhanced vertical launch capacity, integration of the Aegis Ashore-derived sensors for layered air defense, and accommodations for unmanned surface and underwater vehicles from vendors including Teledyne Brown Engineering and Bluefin Robotics. Electronic warfare suites are slated for iterative improvements with partners like Raytheon Technologies and Lockheed Martin to incorporate cooperative engagement capability (CEC) links mirroring Aegis Combat System interoperability. Ongoing research with University of Tokyo and Tokyo Institute of Technology aims to adopt artificial intelligence-assisted sensor fusion and predictive maintenance systems, while collaboration with the Japan Coast Guard and international shipbuilders explores export variants for friendly navies.

Category:Frigate classes Category:Japan Maritime Self-Defense Force ships