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
ECHELON
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ECHELON, originally a secret government code name, is a surveillance program operated by the five signatory states to the UKUSA Security Agreement: Australia, Canada, New Zealand, the UK and the Unite
Electronic warfare support measures
…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 In military telecommunications…
A radome at RAF Menwith Hill, a site with satellite uplink capabilities believed to be used by ECHELON
Equipment at the Yakima Research Station (YRS) in the early days of the ECHELON program
Teletype operators at the Yakima Research Station (YRS) in the early days of the ECHELON program