Narrowband Signals and the Influence of Fades on Phase Measurement.
ROSENSTIEL SCHOOL OF MARINE AND ATMOSPHERIC SCIENCE MIAMI FLA
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The influence of fading on CW amplitude measurements has been treated extensively in the literature. The paper attempts to describe the less familiar influence of fades on phase measurements. In order to gain a viewpoint of the narrowband process which is relatively free of initial assumption or restrictions, the author first reviews signal-plus-noise concepts in terms of a geometrical probability surface model. The construction promises to be a useful tool for analytical and experimental studies of narrowband processes. It also serves to illustrate a definition of fade applicable to signal phase as well as to signal amplitude. In underwater acoustic experiments involving multipath transmissions, the study of phase modulations is complicated by the occurrence of abrupt phase shifts which accompany amplitude fades. This paper describes these events and presents a quantitative analysis of this phase measurement noise process. Author