Virupaksha Radar: The Sensor at the Heart of India’s Super Sukhoi Upgrade

India’s Virupaksha radar is emerging as one of the most consequential airborne sensor programmes in the country’s combat aviation ecosystem. Developed by DRDO and publicly showcased at Aero India 2025, Virupaksha is a multimode, multifunction Active Electronically Scanned Array (AESA) radar intended for the Indian Air Force’s Su-30MKI upgrade programme. In practical terms, it is meant to replace the Su-30MKI’s older Russian N011M Bars radar and become a central pillar of the broader “Super Sukhoi” modernisation effort.

What makes Virupaksha strategically important is that it addresses the biggest limitation of a large fourth-generation fighter in a dense modern battlespace: sensor reach, target handling, survivability under jamming, and compatibility with newer long-range weapons. The Ministry of Defence has already approved procurement of a new Electronic Warfare Suite for the Su-30MKI, and open reporting tied to the upgrade programme indicates that the radar replacement is part of the same wider effort to keep the aircraft operationally relevant for decades. PIB’s 2025 year-end review also explicitly listed Su-30MKI upgrades among key capability tracks underway.

Technically, the most significant revealed feature is that Virupaksha uses AESA architecture with gallium nitride (GaN) transmit/receive modules. DRDO-linked reporting from Aero India 2025 states that the radar has an antenna diameter of about 950 mm and carries approximately 2,400 T/R modules. That is a very substantial array size for a fighter radar and signals a design optimized for higher radiated power, better resolution, and stronger detection performance than older mechanically or passively scanned systems. DRDO officials quoted in the same reporting also said the radar is 4D-capable, meaning it can simultaneously measure a target’s range, azimuth, elevation, and relative velocity.

The shift to GaN matters a great deal. In fighter radars, GaN modules generally offer higher power density, better thermal tolerance, and improved efficiency compared with earlier semiconductor approaches. That translates into real operational advantages: stronger detection performance, more robust track quality, improved resistance to thermal stress, and greater headroom for advanced modes such as high-resolution mapping and electronic protection functions. DRDO’s reported decision to use GaN in Virupaksha suggests India is aiming for a radar that can compete credibly in the contemporary AESA class.

Operationally, Virupaksha has been described as supporting multiple modes simultaneously, including air-to-air, close combat, air-to-ground, air-to-sea, and navigation modes. That matters because modern fighter radars are no longer just search-and-track devices; they are mission computers in sensor form. A Su-30MKI equipped with a radar that can transition fluidly across air dominance, maritime strike, terrain reference, and precision attack roles becomes far more flexible in contested operations, especially when paired with a digital electronic warfare suite and long-range weapons. The radar is also reported to incorporate advanced ECCM features, which are essential if the aircraft is to function effectively in a hostile electromagnetic environment rather than only in permissive airspace.

One of the most important questions around Virupaksha is performance relative to the Bars radar it is expected to replace. DRDO-linked reporting reproduced in DRDO news compilations says the future Su-30MKI upgrade with Virupaksha is expected to improve detection range by roughly 1.5 to 1.7 times over the current Russian radar. That is not the same as a formally released range figure, but it is a useful indicator of design ambition. If that gain is borne out in trials and service integration, it would materially expand the Su-30MKI’s ability to exploit longer-range missiles, detect threats earlier, and manage engagements at greater standoff.

This is especially relevant because the Su-30MKI is expected to remain one of the IAF’s principal combat platforms well into the future. Open reporting carried in DRDO compilations says the IAF plans an initial upgrade tranche of 84 aircraft, with HAL to carry out the work, and that the broader modernization is intended to keep the fleet potent for many more years. The same reporting connects the radar upgrade with the aircraft’s ability to exploit longer-range weapons, including newer air-to-air missiles. Even PIB’s official 2024 and 2025 materials show sustained institutional commitment to the Su-30MKI fleet through engine contracts, new aircraft procurement, and upgrade planning.

From a systems-engineering standpoint, Virupaksha is also significant because it reflects India’s broader attempt to migrate from imported airborne combat sensors toward an indigenous family of fighter AESA radars. PIB’s 2025 year-end review separately noted the integration of the UTTAM AESA radar into later Tejas Mk1A production, showing that DRDO’s indigenous fighter-radar line is no longer a one-off experiment but part of a larger domestic sensor roadmap. Virupaksha appears to sit at the heavier end of that roadmap for a bigger platform with a larger nose and higher power/cooling margins. That implies not just commonality of experience, but the gradual maturation of India’s design, manufacturing, testing, and sustainment base in airborne radar technology.

In doctrinal terms, Virupaksha could change the Su-30MKI from being primarily a large, heavily armed multirole fighter with legacy sensor constraints into a more dangerous long-range air combat and strike platform. AESA radars offer better low-probability emissions management, faster beam steering, multi-target handling, and more graceful degradation than older architectures. Combined with new electronic warfare gear, they can sharply improve survivability against modern air defences and airborne threats. For India, that matters in both western and northern theatres, where dense radar coverage, advanced fighters, stand-off weapons, and electronic contestation are all part of the threat picture.

So the clearest way to understand Virupaksha is this that India wants its biggest fighter fleet to transition into an indigenous digital combat-sensor regime. The officially available information still leaves important gaps, especially on frequency band, instrumented range, track capacity, and weapon-guidance envelopes. But the confirmed elements already tell a serious story: a GaN-based AESA, roughly 2,400 T/R modules, 4D target measurement, multimode simultaneous operation, ECCM integration, and a direct role in the Su-30MKI modernisation programme. If the programme stays on schedule and integrates cleanly with the aircraft’s avionics and weapons, Virupaksha could become one of the most important indigenous airborne combat systems India fields this decade.

Techical Snapshot

• Type: Airborne multimode multifunction AESA radar for fighter aircraft.
• Intended platform: Su-30MKI under the IAF’s upgrade programme.
• Developer: DRDO; shown publicly at Aero India 2025.
• Antenna size: About 950 mm diameter.
• T/R modules: Approximately 2,400.
• Semiconductor tech: Gallium Nitride (GaN) modules.
• Modes reported: Air-to-air, close combat, air-to-ground, air-to-sea, navigation.
• Other reported features: 4D target measurement, pulse-Doppler operation, advanced ECCM.
• Officially undisclosed: Precise frequency band, range, and other detailed classified performance parameters.

Reference:

https://www.drdo.gov.in/drdo/sites/default/files/drdo-news/NPC15to17Feb2025.pdf

https://drdo.gov.in/drdo/sites/default/files/drdo-news/NPC09to11Nov2024.pdf

https://drdo.gov.in/drdo/sites/default/files/drdo-news/NPC10Dec2024.pdf

https://www.pib.gov.in/PressReleasePage.aspx?PRID=2210154

https://www.pib.gov.in/PressReleseDetailm.aspx?PRID=2088180&lang=1&reg=6

https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=1989502