Spatial coherence of acoustic signals in randomly inhomogeneous waveguides—A multiple-scatter theory

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Abstract
A normal mode theory is formulated for estimating the loss of spatial coherence of acousitc signals propagating through in randomly inhomogeneous waveguide. The theory is applicable for experiments in which multiple‐scatter effects are important provided the rate at which energy is scattered with increasing range is limited. Other limitations on the theory require that intermodal scattering between propagating and nonpropagating modes be negligible and that the intramodal scatter of energy within a single mode be narrow‐angled, when measured in the waveguide plane. The scattering of acoustic signals, of significant frequency content ranging upwards from tens of Hertz, by large scale interval wave fields, i.e., wavelengths of the order of 1 kilometer or greater, satisfy the conditions for applicability of the theory.,

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