You searched for: “electronic intelligence
electronic intelligence, ELINT
1. A worldwide U.S. Air Force network which has fixed stations, specially equipped aircraft, and reconnaissance satellites to monitor and record enemy electromagnetic emissions.

These signals are processed to give the nature and deployment of enemy warning and missile guidance radars, fire control, and countermeasures systems.

2. Technical and geolocation intelligence derived from foreign noncommunications electromagnetic radiations emanating from other than nuclear detonations or radioactive sources.
3. Electronic systems, apparatus, and operations for obtaining information concerning a military enemy's capabilities, intentions, plans, and order of battle.