Radio frequency signal direction finding system

摘要

A radio frequency signal direction finding system wherein radio frequency signals received at output ports of a multibeam array antenna are sequentially sampled, in response to a sampling signal, at a frequency fs. The sampled signals are fed to a receiver channel which is tuned to the sampling frequency to produce a composite signal having a frequency fs and a phase angle, relative to a reference phase angle of the sampling signal, which provides an indication of the relative signal levels received at the output ports and hence an indication of the angular direction of a source of the radio frequency signals.