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FISINT (Foreign Instrumentation Signals INTelligence) is intelligence from the interception of foreign electromagnetic emissions associated with the testing and operational deployment of foreign aerospace, surface, and subsurface systems.[1] Since it deals with signals that are not exchanged by humans, it is a subset of ELINT, which, in turn, is a subset of SIGINT. Typical examples of such communication include:

  • Telemetry data (TELINT). Missiles, satellites, and other remotely monitored devices often transmit streams of data concerning their location, speed, engine status and other metrics.
  • Video data links. These may be from UAVs or from satellites used for reconnaissance.

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