Application of Cepstral Processing of Echo Signals in the Profiling of Layered Structure using Parametric Arrays

Abstract

An important task in bottom sediments survey is to determine the boundaries of the layered structure. The echo pulse is the superposition of reflections from several interfaces and the acoustic situation becomes uninformative. When the overlap of echo signals from different boundaries exceeds 50% of the pulse duration, the method of cepstral analysis of the reflected signals was used. The cepstrum of the echo signal from the layered structure allowed us to distinguish the moments of arrival of the component reflections. It is shown that the cepstrum of the low-frequency echo pulse makes it possible uniquely determine the moment of echo signal arrival from the second interface with an overlap of less than 90%. The article is based on materials reported at the Third All-Russian Acoustics Conference (September 21–25, 2020, St. Petersburg).