Abstract
Results of measurement of the coherence of harmonically related CW signals at long ranges are presented, together with a theoretical analysis. In a nondispersive medium, fluctuation in the relative phase angle caused by linear frequency-dependent parameters are relatively low for harmonically related signals. In an experiment conducted with a moving source 500 NM away from the receiver, the relative phase angle stayed unchanged or varied quite slowly in most cases, except around a fading zone. The theoretical analysis of the effect on the phase angle relationship of receiving array configurations, multipath interference, and signal-to-noise conditions is given to explain the observed phenomena. Based on this study, a method of processing the received signal is described which permits the determination of the relative phase angle of two harmonically related CW signals propagating at a distance from the source.
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