passive countermeasures


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passive countermeasures

The detection and analysis of the enemy's electromagnetic emissions. Also called ESM (electronic support measures).
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Passive countermeasures obscure the target making it difficult for the targeting platform to track the target and keep the laser properly aimed.
EO/IR, Part 6 -- Laser Target Designation
When a threat was located, the RWR often cued defensive action, such as evasive maneuvers and active and passive countermeasures, intended to protect the platform.
A sampling of radar warning receivers
The RWR Would then cue the pilot or initiate an autonomous defensive action, such as evasive maneuvers or active and passive countermeasures. ELINT, COMINT and ESM receivers, on the other hand, were characterized by broad frequency ranges, high sensitivity, high probability of intercept (POI) and the ability to record emissions for future classification.
A sampling of radar warning and ESM receivers

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