OVERVIEW: Infrared Search and Track (IRST) 3rd Gen systems feature advanced high-resolution imaging infrared sensors with enhanced tracking, target recognition, and multi-spectral capabilities for superior passive detection.

GENERAL DESCRIPTION: Third-generation IRST uses cutting-edge focal plane array technology with multi-band IR detection (mid-wave and long-wave) and sophisticated onboard processing, including automatic target recognition and simultaneous tracking of multiple targets. These systems provide superior resolution, longer detection ranges, and better resistance to countermeasures compared to earlier generations. Deployed from the 2000s onward on modern fighter jets and naval platforms, 3rd gen IRST enables covert, high-precision targeting and enhances situational awareness in complex combat environments.

ROLE SUMMARY:
Category: Passive Multi-Spectral Infrared Imaging Target Detection
Primary Use: High-resolution detection, tracking, and identification of aerial and maritime threats
Function: Multi-band thermal imaging, automatic target recognition, multi-target tracking
Platform: Advanced fighter aircraft, maritime patrol aircraft, surface combatants
Integration: Integrated with radar, EW systems, and weapons fire control

See Specific information under [Sensors/EW] and [Properties] sections.

SOURCE:
Jane’s Airborne Sensors
https://en.wikipedia.org/wiki/Infrared_search_and_track