passive optical surveillance system

passive surveillance system

passive electronically scanned array (PESA) / passive phased array

electro-optical system

electro-optical warfare system

optical maser system

surveillance, high- and low-altitude surveillance

surveillance, under surveillance

heat passive homing guidance system

passive homing system

passive orientation and damping system

tank passive pitch and roll damping system

passive detection system

Eagle Passive Active Warning Survivability System (EPAWSS)

electro-optical countermeasures

electro-optical sensor

optical decoy

optical device

optical electronic countermeasures

optical flash

optical gas mask

optical homing

optical intelligence

optical mine-hunting

optical munitions

optical range

optical relay

optical sight

optical target-sensor

optical tracking

artillery optical reconnaissance

helmet-mounted optical display

optimized optical link helmet-mounted display