passive electronic countermeasures
Also found in: Acronyms.
passive electronic countermeasures[′pas·iv i‚lek′trän·ik ′kau̇nt·ər‚mezh·ərz]
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.