Abstract
It was recently established that ocean acoustic tomography based on an inversion of ray travel times can be implemented without use of any dedicated sound sources by cross-correlating the ambient noise recorded on two line arrays, the shapes of which are known. In contrast to active tomography, the amount of useful information from noise interferometry is proportional to the product of the numbers of receivers in the two arrays. In our study based on the 2D and 3D numerical experiments, we examine a hypothesis concerning the feasibility of simultaneous performance of a passive ray tomography and passive positioning of arrays through cross-correlation of ambient or shipping noise. The numerical experiments are conducted under conditions close to those of a field experiment on passive ocean tomography. It is demonstrated that, when using arrays of 20–40 hydrophones, the sound velocity profile and the array shape can be found from noise correlation to an accuracy adequate for oceanological and acoustic applications.
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Original Russian Text © V.V. Goncharov, Yu.A. Chepurin, O.A. Godin, 2013, published in Akusticheskii Zhurnal, 2013, Vol. 59, No. 2, pp. 193–201.
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Goncharov, V.V., Chepurin, Y.A. & Godin, O.A. Passive acoustic tomography of the ocean using arrays of unknown shape. Acoust. Phys. 59, 170–178 (2013). https://doi.org/10.1134/S1063771013020048
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DOI: https://doi.org/10.1134/S1063771013020048