Measurement of the direction from which a received signal was transmitted Radiotriangulation scheme using two direction-finding antennas (A and B) Direction finding antenna near the city of Lucerne, Switzerland In the former, the Air Ministry also used RDF to locate its own fighter groups and vector them to detected German raids. RDF was important in combating German threats during both the World War II Battle of Britain and the long running Battle of the Atlantic. Radio direction finding is used in the navigation of ships and aircraft, to locate emergency transmitters for search and rescue, for tracking wildlife, and to locate illegal or interfering transmitters. By combining the direction information from two or more suitably spaced receivers (or a single mobile receiver), the source of a transmission may be located via triangulation. This can refer to radio or other forms of wireless communication, including radar signals detection and monitoring (ELINT/ESM). Direction finding ( DF), or radio direction finding ( RDF), is – in accordance with International Telecommunication Union (ITU) – defined as radio location that uses the reception of radio waves to determine the direction in which a radio station or an object is located.
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