In October 2023, Japan achieved a significant milestone by becoming the first nation to successfully test-fire a medium-caliber maritime electromagnetic railgun from an offshore platform. Following this success, the Japan Maritime Self-Defense Force (JMSDF) is now considering the development of a new class of destroyers equipped with electromagnetic railguns.
The 13DDX future destroyer concept, developed by the Ministry of Defense’s Acquisition, Technology & Logistics Agency (ATLA), gained momentum after the successful railgun tests. In May 2024, Vice Admiral Imayoshi Shinichi, ATLA’s Director General of Naval Systems, presented the ambitious plans for the 13DDX at the Combined Naval Event 2024 in Farnborough, UK, where he discussed the future destroyer and submarine projects of the JMSDF.
According to ATLA, the 13DDX—Air Defense Destroyer will be equipped with advanced systems including Rail Guns, Active SAMs, High-Power Lasers, High-speed Maneuvering Target Detection Radar, HPM Weapons, a Fire Control Network, IPES (Downsizing Large-Capacity GEN), AI-based CDS, Autonomous Navigation, Automated Damage Control, and modular mission capabilities.
The 13DDX will also feature directed energy weapons (DEW) and a new multifunction radar optimized for detecting high-speed targets. It will incorporate elements from the JMSDF’s Asahi-class destroyers and Mogami-class frigates.
In early 2022, the Japanese Ministry of Defense decided to develop an electromagnetic weapon system to intercept hypersonic missiles. By 2023, ATLA successfully tested this system, marking the first maritime railgun test ever conducted. Railguns use electromagnetic energy to fire projectiles at speeds around Mach 7, targeting ships, missiles, and aircraft without the need for gunpowder or explosive propellants.
A railgun can theoretically fire a projectile the size of a bowling ball fast enough to destroy a small building over long distances. Due to their significant power requirements, railguns are typically large and not portable, though there are proposals to adapt this technology for non-weapon uses such as launching aircraft and spacecraft.
The medium-sized electromagnetic railgun prototype developed by ATLA, first seen in May 2023, can fire 40mm steel rounds weighing 320g (0.7lb). The railgun uses five megajoules (MJ) of charge energy to fire bullets at speeds around 2,230m/s (Mach 6.5). ATLA aims to eventually operate the railgun on 20 MJ of charge energy.
Japan plans to deploy the railgun both on land and at sea. Initially, the Aegis Ashore land-based system was intended to enhance ballistic missile interception capabilities, but this plan was abandoned in 2020. The development and testing of railguns come as Japan seeks to counter the threat from hypersonic weapons developed by China, North Korea, and Russia.
Admiral Shinichi emphasized the need to enhance Japan’s long-range air defense capabilities in response to the challenging security environment and growing anti-access/area denial (A2/AD) capabilities of other countries.
Japan is accelerating the development of formidable firepower due to the tense geopolitical landscape in East Asia. In May 2024, Japan entered a railgun cooperation agreement with France and Germany to jointly explore and deploy this advanced technology. Meanwhile, China faced setbacks in its own electromagnetic hypersonic railgun testing.
Japan is bolstering its defense capabilities with the development of the 13DDX and its electromagnetic railgun technology, signaling a new era in naval warfare. Japan also plans to mount railguns on land-based trucks, creating a mobile defense network capable of intercepting hypersonic missiles. As tensions rise in the Indo-Pacific region, the world will be watching Japan’s naval transformation closely.
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