Interception of Hostile Communications
ARMY MATERIEL DEVELOPMENT AND READINESS COMMAND ADELPHI MD COUNTERMEASURES/COUNTER COUNTERMEASURES CENTER
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Whatever the ultimate purpose of an interception system is, it nearly always must achieve the three basic functions of detection, frequency estimation, and direction finding. The fundamental concepts and issues of these three elements of interception are presented at the systems level, assuming that little is known about the signals to be intercepted. The capabilities of radiometers and cross correlators for detection are determined. Channelized, discrete Fourier transform, acousto-optical, instantaneous frequency measurement, scanning superheterodyne, and microscan receivers for frequency estimation are described and analyzed. Direction finding by energy comparison systems with radiometers is analyzed. The two types of interferometers are discussed.
- Direction Finding