Russian combat aircraft utilize prominent external camera-like domes to house infrared search-and-track sensors [1].

These sensors provide a critical tactical advantage by allowing pilots to locate enemy aircraft without alerting them. Because the system is passive, it does not emit the radio frequency signals that traditional radar uses, which prevents the aircraft from being detected by electronic warfare systems.

Mounted on the airframe near the cockpit, these infrared search-and-track (IRST) sensors function by detecting the heat signatures of nearby aircraft [1]. This capability is essential when pilots need to maintain secrecy or operate in environments where radar signals are being jammed [1].

Traditional radar systems act like a flashlight in a dark room, revealing the user's position to anyone watching. In contrast, the IRST system acts like a set of night-vision goggles; it gathers existing energy from the environment to see the target without giving away its own location [1].

This technology allows Russian fighter jet pilots to maintain situational awareness while remaining electronically silent. By relying on heat signatures rather than radio waves, the aircraft can track targets that may be attempting to hide using stealth technology, or electronic countermeasures [1].

“These sensors provide a critical tactical advantage by allowing pilots to locate enemy aircraft without alerting them.”

The reliance on IRST technology highlights a strategic shift toward passive detection to counter modern electronic warfare. As radar-jamming capabilities and stealth aircraft become more prevalent, the ability to track targets via thermal signatures ensures that fighter jets can still engage threats even when traditional radio-based detection is neutralized.