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== Infrared Countermeasures (IRCM) ==
{{main|Infrared countermeasure}}
Infrared guidance systems in heat-seeking missiles are designed to track strong sources of infrared radiation – heat – such as aircraft engines, helping missiles to home in on their targets. IRCM systems are based on a modulated source of infrared radiation with a higher intensity than the target itself. When a [[missile seeker]] observes this modulated radiation, it interferes with or obscures the modulated signal from the aircraft and renders the missile incapable of maintaining a lock on the target.
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