JS Mogami vs INS Nilgiri: How Japanese Naval Technologies Can Shape India’s Next Generation of Indigenous Warships
In recent years, the relationship between India and Japan has evolved significantly, transforming this partnership from primarily economic cooperation to one of the most critical strategic defence partnerships in the Indo-Pacific region. This strengthening of bilateral ties is heavily driven by shared concerns over China’s rapidly expanding maritime footprint and a mutual need to maintain a free and open Indo-Pacific. As a result, defence cooperation has become a major pillar of their relationship, fostering deep mutual trust through regular naval exercises, strategic dialogues, and growing industrial collaborations. Since nearly 95% of India’s trade by volume and about 90% of Japan’s energy imports rely on secure Sea Lines of Communication (SLOCs), maritime security sits at the very heart of their joint efforts as demonstrated through the Malabar Naval Exercise and the Quad framework.
The latest and perhaps most exciting milestone in this journey is Japan’s proposal to transfer the Mogami-class stealth frigate design and collaborate with India on the highly advanced UNICORN (Unified Complex Radio Antenna) integrated mast system. Driven by Japan’s recent relaxation of long-standing defence export restrictions and India’s strong push for Aatmanirbhar Bharat and “Make in India”, this partnership is shifting rapidly from simple military exercises to deep transformative defence technology collaboration.
Mogami Class : More Than Just Another Frigate
While the proposal might look like a standard defence export deal at first glance, its strategic value goes far beyond the simple acquisition of a new warship. Japan is now willing to share its most closely guarded and advanced naval technologies with trusted partners which makes this one of the most significant technology offers ever extended to India. The true worth of this deal lies in the transfer of cutting-edge innovations like high level ship automation, stealth oriented design, integrated sensor architecture and modular construction techniques. The Japanese Mogami class is a 5,500 tonne multi-mission stealth frigate, developed by Mitsubishi Heavy Industries for the Japan Maritime Self Defence Force. This frigate is highly capable of executing anti-air, anti-submarine, anti-surface and mine countermeasure operations, but its real genius lies in its core design philosophy. It places an intense emphasis on remaining incredibly difficult to detect by actively reducing the ship’s Radar Cross Section. This frigate utilises a highly modular layout that ensures weapons, electronic systems and sensors can be easily upgraded over its 33-40 year service life with minimal structural changes. India has already proven its advanced shipbuilding capability with the Nilgiri class Frigates (Project 17A) and Visakhapatnam class destroyers (Project15B). Mogami class should be viewed as a powerful technology demonstrator rather than just another foreign platform.
The Power of Deep Automation
The most remarkable feature of the Mogami class frigate is its massive leap forward in onboard system operation automation. The Mogami class operates efficiently with a crew of only about 90 sailors through a highly sophisticated Integrated Platform Management System (IPMS), automated machinery control and extensive digital monitoring. This represents a dramatic reduction compared to the 160 to 220 personnel typically required to operate frigates of a similar size. Slashing the crew size not only significantly cuts down on routine personnel and maintenance costs but also frees up valuable internal space that would otherwise be dedicated to crew accommodation and life-support facilities.
Naval architects can repurpose this newly available volume to significantly boost the ship’s lethal capabilities. The extra space can easily house additional Vertical Launch System (VLS) cells capable of carrying more weapons in reserve like the BrahMos, BrahMos-NG, VL-SRSAM and even highly anticipated future hypersonic missiles. It provides the necessary room for larger fuel reserves to extend operational endurance, larger Combat Information Centres (CICs), dedicated launch and recovery bays for Unmanned Aerial Vehicles (UAVs) and Unmanned Underwater Vehicles (UUVs) and massive power banks for future Directed Energy Weapons (DEWs) like high energy lasers and microwave systems. As artificial intelligence and autonomous systems increasingly define the future of naval warfare, physical internal space saved through automation will also become an incredibly vital strategic asset.
Redefining Stealth with the UNICORN Mast
The UNICORN integrated mast stands out as one of the most critical technologies Japan has offered beyond the layout of the ship’s hull. In modern naval warfare ships face constant deadly threats from long-range surveillance satellites, airborne early warning aircraft and highly capable anti-ship missiles boasting striking ranges exceeding 300 to 500 kilometres. Drastically reducing a warship’s detectability is just as crucial as upgrading its offensive firepower in this harsh reality.
Traditional warships are cluttered with numerous externally mounted antennas for vital systems like communications, Identification Friend or Foe (IFF), tactical data links, GPS, navigation, satellite links and Electronic Support Measures (ESM). While highly necessary, this massive cluster of exposed antennas drastically increases the ship’s Radar Cross Section (RCS), making it highly reflective to enemy radar and much easier to track. This vulnerability is dangerous in modern day naval warfare because modern anti-ship missiles like the YJ-21, CM-400 and Tomahawk Maritime Strike rely heavily on long range targeting data to engage surface vessels. Packing dozens of radio frequency antennas close together causes Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) issues which can severely degrade sensor performance. Harsh winds,vibration and constant exposure to saltwater drives up maintenance costs and lowers equipment lifespan. The UNICORN mast brilliantly solves all these problems by neatly housing communication antennas, IFF systems, tactical data links, navigation equipment and ESM sensors entirely within a single low-observable composite structure.
This sleek architecture slashes radar reflective surfaces, improves electromagnetic compatibility and shields sensitive electronics from the harsh marine environment and lowering maintenance needs. Crucially it also supercharges network-centric warfare capabilities by enabling faster and highly secure information exchanges between warships, aircraft, satellites and other assets which ensuring naval commanders have superior situational awareness to act swiftly.
MF-STAR and UNICORN
Some debates have mistakenly compared UNICORN mast to the MF-STAR (Multi-Function Surveillance, Track and Guidance Radar) system currently dominating Indian Navy destroyers like the Visakhapatnam-class (Project 15B). This comparison misses the mark completely because these two advanced systems serve fundamentally different operational roles.
The MF-STAR radar developed by Israel Aerospace Industries (IAI) and manufactured domestically by Bharat Electronics Limited (BEL) is the Indian Navy’s premier Active Electronically Scanned Array (AESA) multifunction radar. Operating in the S-band, the MF-STAR is a sheer powerhouse capable of simultaneously detecting, tracking and engaging hundreds of aerial and surface targets while actively guiding the Barak-8 Long Range SAM system. Open source estimates indicate it can easily track over 250 to 300 targets at once and detect high-altitude aircraft from over 250 kilometers away, establishing it as one of the best naval radars in active service. On the other hand, the UNICORN mast is not a primary surveillance or fire control radar at all instead it acts as a highly stealthy communication and sensor integration hub, carefully managing tactical networking and electronic support measures without generating a massive radar signature. Instead of debating which system to choose naval planners should focus on how beautifully these technologies can complement each other.
A future indigenous destroyer could seamlessly combine a next-generation AESA radar for unmatched long range surveillance with the UNICORN mast for flawless stealthy communications,creating a vastly superior and highly survivable combat platform without sacrificing any capability.
Preparing for the Realities of Future Warfare
The ultimate goal of integrating these Japanese innovations is not to replace India’s booming indigenous capabilities but to empower the Indian Navy to adapt to the rapidly evolving nature of maritime combat. Over the last two decades India has built over 95% of its naval warships in domestic yards. India boasts homegrown firepower and technology, successfully fielding them on indigenous aircraft carrier INS Vikrant alongside modern destroyers and frigates. India’s offensive and defensive suites are equally impressive including mighty BrahMos supersonic cruise missile, Barak-8 LR-SAM, VL-SRSAM, advanced Combat Management Systems (CMS), highly capable HUMSA-NG sonar, Varunastra heavyweight torpedo and complex electronic warfare suites.
The operational environment is changing faster than the platforms themselves. The drone swarms, loitering munitions and mass missile salvos witnessed in the Red Sea and the Russia-Ukraine war vividly highlight how vulnerable traditional surface combatants have become in modern conflict. To survive these high intensity engagements future warships require much larger inventories of interceptor missiles, lightning fast combat management systems and a heavily integrated naval air defence network. The Indian Navy is actively pursuing a sophisticated ship based BMD system conceptually similar to the U.S. Navy’s Aegis Combat System to perfectly coordinate long range radars and multiple interceptors against aircraft, ballistic missiles, cruise missiles and mass drone attacks. Japanese technology acts as a massive enabler here. Ships naturally gain the crucial physical space, electrical power generation and digital infrastructure required to field these heavy VLS cell inventories and power-hungry defence networks by drastically reducing crew sizes through automation and utilizing modular layouts.
Project-18 and the Road to Self-Reliance
All of these concepts find their ultimate expression in Project-18 which will be Indian Navy’s highly capable next-generation destroyer programme. Expected to displace a massive 10,000 to 13,000 tonnes and sail for over 35 to 40 years, this platform must be inherently designed to face tomorrow’s most terrifying threats including hypersonic missiles and intense network-centric warfare. Project-18 should intelligently adopt Japan’s integrated design philosophy from the keel up, prioritizing automation, modular architecture and advanced sensor fusion via systems like the UNICORN mast instead of just increasing the ship’s displacement to accommodate more weapons.
Fusing these structural advantages with India’s battle tested offensive suite of BrahMos missiles, next-generation AESA radars and domestic combat management systems will result in a uniquely Indian warship completely tailored for the harsh realities of the Indo-Pacific. The most profound and lasting benefit of this collaboration is the deep technology transfer. Historically true military power comes not from merely purchasing foreign arms but from absorbing complex knowledge and building robust domestic industries which India has achieved with the Arihant-class submarine, Akash air defence system and its indigenous shipbuilding boom. Co-developing the UNICORN mast gives companies like BEL, MDL, L&T and other domestic manufacturers invaluable hands-on experience in advanced radio-frequency engineering, electromagnetic compatibility, digital ship automation and sensor fusion. In the long run this deep expertise will allow India to independently design and produce next generation integrated masts and automated systems without relying on foreign suppliers which is directly fulfilling the core vision of Aatmanirbhar Bharat and firmly cementing India’s status as a formidable powerhouse in the global defence export market.
Conclusion
While the strategic partnership between India and Japan offers incredible opportunities for naval modernisation, realizing its full potential requires navigating several practical challenges. The biggest hurdle is seamless technology integration. Adapting advanced Japanese systems like UNICORN mast and to work flawlessly with India’s diverse mix of indigenous and Israeli weapons sensors and equipment demands deep indigenous adaptation. It requires a fundamental absorption of the technology, not just plugging foreign systems into Indian hulls. Additionally financial realities of these state of the art technologies must be carefully managed. Balancing high upfront costs and establishing a robust framework for long term maintenance is critical. Indian shipyards must proactively develop localized expertise and domestic supply chains to sustain these complex warships over their 30 to 40 year lifespans without relying entirely on foreign suppliers. If India and Japan wish to market their jointly developed platforms globally, then figuring out how to deal with strict export rules will determine the success of such a venture. Aligning export regulations will facilitate transfers to partner nations which is a great way to earn back the massive costs of developing them. If New Delhi and Tokyo can successfully mix their technologies, keep long term maintenance costs down and simplify their export rules then this historic partnership will completely change the security landscape of the Indo-Pacific region.
Written By: Chandan Vishwas Edited By: Arpit Khanduri
Comments