Passive Measurement of Vertical Transfer Function in Ocean Waveguide using Ambient Noise

This paper introduces a function of correlation between two hydrophones, basing on the Kuperman-Ingenito ocean ambient noise model. There is a similarity in form between the cross correlation function and the transfer function in ocean waveguide from a point source to a receiver. Thus, the noise cross correlation function between two hydrophones in vertical location can extract actual transfer function, and then the acoustics ray arrival structure of propagation in vertical waveguide can be analyzed. In this paper, the transfer function in vertical ocean waveguide can be obtained from broadband ambient noise cross correlation function of vertical line array. There are some analysis about physical significance of noise interference basing on compared simulation and experiments. This method can be used to research stratification sea floor considering the arrival time structure of each propagation route.