passive electronic countermeasures


passive electronic countermeasures

[′pas·iv i‚lek′trän·ik ′kau̇nt·ər‚mezh·ərz] (electronics) Electronic countermeasures that do not radiate energy, including reconnaissance or surveillance equipment that detects and analyzes electromagnetic radiation from radar and communications transmitters, and devices such as chaff which return spurious echoes to enemy radar.