2025_programme: Correlation analysis of noise signal using two vertical arrays and retrieval of modal dispersion curves in shallow water
- Day: June 16, Monday
Location / Time: B. ERATO at 15:30-15:50
- Last minutes changes: Cancelled
- Session: 07. Inverse Problems in Acoustical Oceanography
Organiser(s): Julien Bonnel, Stan Dosso
Chairperson(s): Julien Bonnel, Stan Dosso
- Lecture: Correlation analysis of noise signal using two vertical arrays and retrieval of modal dispersion curves in shallow water
Paper ID: 2177
Author(s): Marina Yarina, Boris Katsnelson, Oleg Godin
Presenter: Boris Katsnelson
Abstract: Correlation analysis of the sound field in an ocean waveguide is being applied to study both noise and coherent signals using both single hydrophones and linear arrays. Based on such measurements, it is possible in principle to construct dispersion dependences of waveguide modes and, accordingly, determine the waveguide parameters. This paper presents the results of constructing the dependences mentioned and based on modeling the cross-correlation function in a shallow waveguide with a layered bottom, containing low velocity layer. Broadband signal is supposed to be radiated from a moving source and measured by two synchronized vertical line arrays occupying some part of water layer. Model of waveguide consists of water column and the low-velocity bottom layer. It is shown that diagram of the Cross Correlation Function (CCF), constructed in coordinate (phase speed – frequency) can provide estimation of parameters of layer, due to specific features of frequency dependence of modal phase speed. Connection of frequency behavior of eigen values and eigen functions, as well as phase and group speed of waveguide modes in the presence of low-velocity bottom layer with the corresponding dispersion curves on CCF diagram is studied. Possible experimental observations are discussed \nWork was supported by ISF, grant 946/20.\n
- Corresponding author: Prof Boris Katsnelson
Affiliation: Professor Emeritus
Country: Israel
