Title: Analytic study on acoustic interference pattern in shallow water

Author(s): CHEN Shouhu; ZHAO Lianjun; CAO Jianguo; GAO Bing; ZHU Mo; HU Yuan; MA Li;

Affiliation(s): Institute of Acoustics, University of Chinese Academy of Sciences; et al.

Abstract: Analytic formulas for acoustic interference patterns in shallow water are derived by ray method, which can be used to guide acoustic measurements with limited horizontal distances. Some necessary approximations are taken for a concise expression. The analytic formulas represent the quantitative relationships between the interference-pattern and the signal frequency, bandwidth, depth of source and horizontal distance. Monofrequent signals, complicated signals and frequency-modulated signals are all studied. Several inferences are also deduced from the formulas. Both numerical simulations and experiment data are presented to prove that these formulas and their inferences can describe the critical characters of the acoustic interference pattern in the waveguide with a satisfying precision.