In military telecommunications, electronic support or electronic support measures gather intelligence through passive "listening" to electromagnetic radiations of military interest. They are an aspect
RAF Menwith Hill, a large ECHELON site in the United Kingdom, and part of the UK-USA Security Agreement.
French ship Dupuy de Lôme, specialised in SIGINT
Electronic warfare
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Electromagnetic warfare or electronic warfare is warfare involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack an enemy, or impede enemy operations. The
Electronic warfare support measures
…support measures (ESM) gather intelligence through passive "listening" to electromagnetic radiations of military interest. They are an aspect of electronic warfare involving actions taken under direct control of an operational commander to detect, intercept, identify, locate, record, and/or analyze sources of…
United States Space Force personnel operating a satellite antenna during an electromagnetic warfare military exercise
Krasukha, a Russian mobile, ground-based, electronic warfare (EW) system used to jam AWACS and airborne radars on radar-guided missiles
A right front view of a USAF Boeing E-4 advanced airborne command post (AABNCP) on the electromagnetic pulse (EMP) simulator (HAGII-C) for testing