Studies on Time Variation of Ambient Sea Noise and Scattering of Acoustic Signals from Rough Surfaces

摘要

This report is a collection of three papers on two subjects: the scattering of acoustic waves from rough surfaces and the time variation of ambient sea noise. Part I, on scattering, treats the stochastic character of a plane-wave signal that has been reradiated from a rough surface, through an investigation of the properties of the coherence of the reradiation. Parts II and III, on noise, describe the results thus far obtained in an experimental program to investigate the time variation of low-frequency ambient sea noise. (Author)