The battlefield of tomorrow is heavily reliant on electronic warfare, where advanced radar jamming and countermeasures are the norm.
To maintain air superiority, the Defence Research and Development Organisation (DRDO) may need to look beyond simply extending the range of the Astra missile family.
Defence analysts suggest that developing an Electro-Optical/Infrared (EO/IR) seeker for the upcoming Astra Mk2 could be a game-changer.
The Astra Mk2, which already boasts an impressive estimated range of over 160 kilometres thanks to its dual-pulse solid rocket motor, would gain the ability to strike targets silently as a passive beyond-visual-range air-to-air missile (BVRAAM), emitting no radar signals during its final approach.
Presently, the Astra Mk2 is designed to use an indigenous active Radio Frequency (RF) seeker, reportedly leveraging cutting-edge Gallium Nitride (GaN) technology to improve its tracking and power.
This is paired with an inertial navigation system and a secure two-way datalink that guides the missile during the middle of its flight.
As the weapon nears the target's estimated location, its internal radar turns on to lock onto the enemy aircraft and ensure a successful hit.
Although this active radar method is the global standard for modern BVRAAMs, it comes with a major drawback.
When the missile's radar activates, it can alert the enemy pilot. Modern fighter jets are fitted with Radar Warning Receivers (RWRs) that detect these incoming radar waves, giving the hostile aircraft crucial seconds to perform evasive manoeuvres or deploy electronic countermeasures to spoof the missile.
Introducing a passive EO/IR seeker would completely alter how these aerial engagements unfold.
Rather than broadcasting radar signals, an EO/IR-equipped missile relies on highly sensitive visual and heat sensors to find and track its prey. Because this system is entirely passive and emits no energy, standard radar warning systems on enemy jets would remain silent.
This stealthy approach drastically cuts down the reaction time available to the defending pilot.
The initial stages of the missile's flight would remain largely unchanged. It would still use inertial navigation and receive encrypted mid-flight course corrections from the launching fighter jet or an allied Airborne Early Warning and Control (AEW&C) aircraft.
Once it enters the final kill zone, the EO/IR seeker would take over, independently acquiring and destroying the target without outside help.
This type of passive guidance is becoming vital as rival nations rapidly advance their electronic warfare capabilities, making it easier to confuse or jam traditional radar-guided weapons.
Passive EO/IR sensors cannot be blinded by radio-frequency jamming since they "see" the target using heat and visual data instead of bouncing radar waves off it. This unique trait makes them an ideal weapon against advanced fighter jets that are heavily equipped with powerful electronic attack suites.
However, the true success of an EO/IR seeker relies on the integration of smart software and artificial intelligence (AI).
Today's most advanced optical seekers use AI to accurately identify targets, ensuring the missile does not get confused by background clutter like clouds, the sun, or mountains.
Instead of blindly chasing the hottest object in the sky, smart algorithms analyse the shape, movement, and specific heat patterns to confirm it is tracking an actual enemy aircraft.
This intelligent tracking is crucial for overcoming the most common defence against heat-seeking missiles: the deployment of burning flares.
By merging standard visual imagery, long-wave thermal sensors, and AI processing, a next-generation EO/IR seeker would be nearly impossible to fool with traditional flares.
The missile would not just look for heat; it would visually lock onto the specific physical features of the aircraft, ensuring it stays on target until impact.
It is important to acknowledge that stealthy seekers are not completely invisible. Many modern combat jets are now equipped with Missile Approach Warning Systems (MAWS).
These systems look for the ultraviolet or infrared light created by a missile's rocket motor. Therefore, even if the Astra Mk2 emits no radar signals, a sophisticated MAWS could still spot the incoming threat.
Nevertheless, advanced MAWS technology is not universal, and the quality of these systems varies greatly among different militaries.
When facing adversaries with older or less capable aircraft, a passive seeker would offer a massive tactical advantage by giving the enemy almost no time to react.
Creating such an advanced weapon system will certainly pose major engineering hurdles for Indian scientists.
Building a sensor that can spot a small fighter jet from dozens of kilometres away demands ultra-high-resolution cameras, incredibly fast computer processors, and software that works flawlessly in bad weather or poor light.
Furthermore, packing all of this delicate technology into the narrow, aerodynamic nose cone of a supersonic missile is an exceptionally difficult task.
Fortunately, India has been rapidly building its domestic capabilities in electro-optical and semiconductor fields.
Various DRDO facilities and private defence firms, like Tonbo Imaging, are already working on AI-driven EO/IR sensors for smart bombs and other munitions.
This growing indigenous ecosystem, coupled with India's push towards self-reliance, means the foundational technology for an Astra EO/IR seeker is already taking shape.
Ultimately, an EO/IR Astra Mk2 would not replace the radar-guided models, but rather fight alongside them.
Modern air forces prefer a diverse arsenal of missile seekers. By firing both active radar and passive thermal missiles, the Indian Air Force could overwhelm enemy defences, forcing hostile pilots to defend against two completely different types of threats at the same time.
