Estimation of the coefficient of sound reflection from the bottom based on the analysis of the spatio-angular field structure

A method for estimating the coefficient of sound reflection from the bottom of a waveguide based on field measurements using a vertical array at various distances from the source is discussed. To analyze the spatial-angular structure of the recorded field, the method of coherent states, borrowed from quantum theory, is used. The acoustic analogue of the coherent state expansion allows one to construct a filter to isolate the field component representing the contribution of a given narrow beam of rays. The ratio of the amplitudes of such a field component before and after reflection from the ground gives an estimate of the reflection coefficient of the central ray. The effectiveness of the approach was tested using numerical simulation data. The results of its application for processing data from a lake experiment are presented.