EO/IR Gimbal

An EO/IR gimbal is the stabilized turret that carries a drone's cameras: electro-optical — a daylight video camera, usually with powerful optical zoom — and infrared — a thermal imager for night and obscured conditions. The assembly hangs beneath the aircraft on motorized axes that counter-rotate against the aircraft's motion, vibration, and wind, so the picture stays steady on a target while the drone maneuvers. Stabilization quality, measured in microradians of jitter, is the hidden specification that determines whether zoomed imagery is usable at all.

Around the two core sensors, gimbals add mission hardware: laser rangefinders that give exact target coordinates, laser designators that guide precision weapons, and sometimes SWIR or low-light channels. Onboard processing provides object tracking, so the operator can designate a vehicle and have the gimbal follow it hands-off, and moving-target indication on larger systems.

The gimbal is usually the most expensive component on a small drone and the main reason drones replaced crewed observers in so many roles. Weight and stabilization quality scale together, so gimbal classes track aircraft classes closely, from palm-sized units on quadcopters to multi-sensor balls on MALE platforms weighing hundreds of kilograms.