active detection systems

active countermeasures

Those countermeasures that require transmissions from friendly sources. Active countermeasures can be electromagnetic, IR (infrared), electro-optical, or microwave. Among electromagnetic active countermeasures, the most common are deception jamming, self-protection jamming, and stand-off jamming. This is in contrast to passive countermeasures such as chaff dispensing. Also called active detection systems.
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On the other hand, the NIST system is relatively broadband so it eliminates the problem of glint often associated with active detection systems. Glint is produced by uncontrolled standing waves generated between the target and its environment.

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