In
signals intelligence (SIGINT), non-communications signals are any signals sent out for a purpose other than communicating information. This includes
radar
Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...
emissions and emissions from
instrumentation (which provide information, but are not sent out for the purpose of providing information to others).
, which came to be studied in great detail after
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, attempts to detect and analyze enemy non-communications signals.
Foreign instrumentation signals intelligence Foreign instrumentation signals intelligence, FISINT (''F''oreign ''I''nstrumentation ''S''ignature ''INT''elligence) is intelligence from the interception of foreign electromagnetic emissions associated with the testing and operational deployment o ...
(FISINT) focuses specifically on non-communications signals emitted by instrumentation, including
telemetry
Telemetry is the in situ data collection, collection of measurements or other data at remote points and their automatic data transmission, transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Gr ...
signals sent between components of a system.
References
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