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 system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
emissions and emissions from
instrumentation
Instrumentation is a collective term for measuring instruments, used for indicating, measuring, and recording physical quantities. It is also a field of study about the art and science about making measurement instruments, involving the related ...
(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 (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, 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 ...
(FISINT) focuses specifically on non-communications signals emitted by instrumentation, including
telemetry
Telemetry is the in situ collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Greek roots ''tele'', 'far off', an ...
signals sent between components of a system.
References
{{Comm-stub