Investigation of peculiarities of low-frequency noises' spectral-correlation characteristics in shallow sea for purposes of passive tomography

Results of the correlation processing for the low-frequency noise recorded in the Barents Sea by spatially separated bottom hydrophones are considered. Comparison of experimental data with results of numerical simulation shows that the inter-mode interference may play a significant role in the formation of the spectral-correlation characteristics of low-frequency noises, but not only the presence of the stationary phase point near the minimum of the dispersion curves of the group velocities for the different modes, as it was assumed before. It is demonstrated that the filtration of the frequency range, where the noise field is formed only by the lowest mode, makes it possible to increase the output signal-to-noise ratio in correlation processing that can be used during the development of passive tomography schemes.