Direction finding (DF) involves determining the direction of arrival of a radio wave. Since the conception of signals intelligence (SIGINT) gathering, direction finding has been an important part of the intelligence cycle. Direction finding is used to support other intelligence information. It is normally integrated with other sources of intelligence such as communications and noncommunications intercept to determine the approximate location, movement, and relocation of threat emitters. Direction finding bearings and locations are used in developing threat order of battle (OB) information to support national and tactical intelligence information. This field manual provides direction finding doctrine, procedures, techniques, and theory for personnel conducting strategic and tactical operations.
DesignationFM 34-40-9
EditionAug 1991
StatusSuperseded
Pages222
FunctionRecon Intel
CollectionRecent Archive