India-Japan sign first defence co-development pact for UNICORN naval masts
Synopsis
India and Japan have crossed a landmark threshold — moving from a buyer-seller defence relationship to genuine co-development. The UNICORN naval mast programme, with BEL as India's production partner, is the first test of whether this partnership can deliver technology transfer at scale for the Indian Navy's modernisation.
Key Takeaways
India and Japan signed their first bilateral defence co-development agreement on 6 July .
The inaugural project covers the UNICORN (NORA-50) integrated shipborne communications mast, originally developed by NEC Corporation for Japan's Mogami-class frigates .
Bharat Electronics Limited (BEL) will manufacture the system in India; Japan provides design and core technologies.
The mast consolidates radar, ESM, IFF, Link 16, VHF/UHF, and tactical navigation systems into a single structure, reducing radar cross-section and improving stealth.
India concluded a separate UNICORN export agreement with Japan in November 2024 , which paved the way for this co-development pact.
The system is expected to gradually replace existing communication and sensor masts across the Indian Navy's fleet.
India and Japan on 6 July signed their first-ever bilateral agreement for the joint development of defence equipment, a milestone in the two nations' deepening strategic partnership. The inaugural project under the pact will focus on the co-development and licensed production of the UNICORN (Unified Complex Radio Antenna) shipborne communications mast — an advanced integrated mast system originally developed by Japan's NEC Corporation.
What the Agreement Covers
Under the arrangement, Bharat Electronics Limited (BEL) will manufacture the UNICORN system in India in collaboration with Japanese partners. According to Japan's Ministry of Foreign Affairs, Japan will supply the design and core technologies, while India will handle system integration, localisation, and production — consistent with the government's 'Make in India' initiative. India also plans to integrate its own sensors and antennas into the mast for deployment on Indian Navy warships.
What UNICORN Is and Why It Matters
The UNICORN system, also designated NORA-50, was jointly developed by NEC Corporation, Sampa Kogyo K.K., and The Yokohama Rubber Co., Ltd. for Japan's Mogami-class frigates. Development took place between 2015 and 2016, with serial production commencing in 2018 and the first installation on Mogami-class frigates in 2019.
The integrated mast consolidates multiple communication, surveillance, and electronic warfare antennas into a single structure. Its suite includes an omnidirectional surveillance radar antenna, electronic support measures (ESM) antennas, Wi-Fi and Link 16 antennas, UHF transmit and receive antennas, identification friend-or-foe (IFF) systems, VHF/UHF communication antennas, a tactical navigation system, and a lightning conductor.
Strategic and Stealth Advantages
Beyond consolidating hardware, the integrated design significantly reduces the number of externally mounted antennas on a ship's superstructure. This lowers a vessel's radar cross-section, enhancing stealth characteristics and making naval platforms harder to detect. The system is also expected to improve space utilisation and reduce maintenance complexity across the Indian Navy's fleet, where it is slated to gradually replace existing communication and sensor mast systems.
The Road to This Agreement
India's interest in the UNICORN technology spans several years. In November 2024, the two countries concluded a separate agreement for the export of UNICORN multifunctional masts to India under their broader strategic partnership — that export deal directly paved the way for the current co-development initiative. The latest pact marks a qualitative shift: from buyer-seller to genuine technology partners. This comes amid a wider push by both governments to deepen defence-industrial ties as Indo-Pacific security dynamics evolve.
What Comes Next
With BEL designated as the Indian production partner, the programme is expected to advance under an established defence public sector framework. The integrated mast's gradual adoption across the Indian Navy's fleet would represent one of the most substantive Japan-origin technology transfers in India's naval modernisation programme to date.
Point of View
Likely driven by shared concerns over Indo-Pacific maritime security. The real measure of success, however, will be the depth of technology transfer: whether BEL gains genuine design competency or remains a licensed assembler. India's defence co-production history is littered with arrangements that delivered hardware but not know-how. The UNICORN programme's sensor-integration clause — where India adds its own antennas — is the most important detail, and the one most worth watching.
NationPress
6 Jul 2026
Frequently Asked Questions
What is the India-Japan UNICORN defence co-development agreement?
It is the first bilateral agreement between India and Japan for the joint development of defence equipment, signed on 6 July. The inaugural project under the pact covers the co-development and licensed production of the UNICORN integrated shipborne communications mast, with Bharat Electronics Limited manufacturing the system in India.
What is the UNICORN naval mast and what does it do?
UNICORN (also designated NORA-50) is an integrated mast system that consolidates multiple communication, surveillance, and electronic warfare antennas — including radar, ESM, IFF, Link 16, VHF/UHF, and tactical navigation — into a single structure. It reduces a vessel's radar cross-section, improving stealth, and was first deployed on Japan's Mogami-class frigates in 2019.
What is India's role in the UNICORN programme?
India, through Bharat Electronics Limited (BEL), will handle system integration, localisation, and production of the UNICORN mast. India also plans to incorporate its own sensors and antennas into the system for Indian Navy warships, going beyond simple licensed assembly.
How does this pact relate to the November 2024 India-Japan agreement?
In November 2024, India and Japan signed a separate agreement for the export of UNICORN multifunctional masts to India. That export deal directly paved the way for the current co-development pact, marking an upgrade from a buyer-seller arrangement to a technology partnership.
How will the UNICORN mast affect the Indian Navy?
The UNICORN system is expected to gradually replace existing communication and sensor mast systems across the Indian Navy's fleet. Its integrated design reduces maintenance complexity, improves space utilisation, and lowers radar cross-section, enhancing the stealth characteristics of Indian naval platforms.
