OVERVIEW: Second Generation IR Gun Directors introduced basic infrared imaging capabilities in the 1980s–1990s, offering improved passive target tracking for naval and air defense guns under ECM-heavy or low-visibility environments.

GENERAL DESCRIPTION: Second-generation IR gun directors incorporated cooled infrared focal plane arrays (typically InSb or MCT-based) with limited pixel resolution, allowing for basic thermal imaging. These systems provided better discrimination of heat sources, automatic target tracking, and angular cueing for radar or optical fire-control systems. Mounted on stabilized gimbals, they supported passive engagement capabilities, especially against low-flying aircraft, missiles, or fast surface targets. Some also featured integrated laser rangefinders for range data.

ROLE SUMMARY:
Category: Infrared Fire-Control System
Primary Use: Passive target detection and gunfire direction in low-visibility or jammed environments
Function: Mid-resolution thermal imaging and automatic target tracking
Platform: Naval vessels, ground-based AAA and SHORAD systems
Integration: Tied into radar or EO fire-control networks with optional laser ranging

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

SOURCE:
https://en.wikipedia.org/wiki/Gun_director
FLIR Systems Product Histories and Defense Catalogs