Markus, John Formerly, Consultant, Sunnyvale, California.
DeLia, Paul J. L-3 Communications Corporation, New York.
Last reviewed:December 2019
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Intentional generation of interfering signals in the electromagnetic and infrared spectrum by powerful transmitters as a countermeasure intended to block a communication, radar, or infrared system or to impair its effectiveness appreciably. Radio broadcasts or radio messages can be jammed by beaming a more powerful signal on the same frequency at the area in which reception is to be impaired, using carefully selected noise modulation to give maximum impairment of intelligibility of reception. When stations on many different frequencies are to be jammed or when an enemy is changing frequencies to avoid jamming, the jamming transmitter is correspondingly changed in frequency or swept through a range of frequencies over and over again. Techniques similar to this are also used at radar frequencies to jam early-warning and gunfire-control radar systems. See also: Electronic warfare
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