In this paper we demonstrate numerically vertical array output of multimodal acoustical signal, which propagates in randomly inhomogeneous oceanic waveguide. The input signal is sum of normal waves with given wave number spectrum and random amplitudes, which have some (range-dependent) scale of cross-modal correlations. We obtain quantitative estimator of impact basic physical signal characteristics (intensity spectrum of the signal-carrying modes, wave number spectrum, cross-modal correlations) on the array output in different oceanic noise models (continuous and discrete mode spectrum). The results of this work enable to find dependence large array efficiency on multimodal signal’s propagation effect in underwater sound channel.
43.60.Fg Acoustic array systems and processing, beam-forming
43.30.+m Underwater sound
1) Institute of Applied Physics, Russian Academy of Science, Russia, Nizhny Novgorod, Ul'yanov Street, 46, 603950; N.I. Lobachevsky State University of Nizhny Novgorod, Russia, Nizhny Novgorod, Gagarin Avenue, 23, 603950. 2) Institute of Applied Physics, Russian Academy of Science, Russia, Nizhny Novgorod, Ul'yanov Street, 46, 603950.
Science News of the Faculty of Physics, Lomonosov Moscow State University
This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.