Spatial filtering of the multimode signal which is assumed to be a superposition of some regular modes with arbitrary amplitudes and is received against the intensive noise background some part of which is the modal noise. The array filtering performance is chosen to be the array gain. Computer simulation is performed for a vertical array arranged in an ocean waveguide under the conditions of mutually-uncorrelated modal amplitudes for the signal and the modal noise. The focus is comparative study of the optimal array filtering and heuristic technique of matched-mode filtering (with enumeration of the mode numbers). The array gain performance is demonstrated to vary in a wide range of its quantity in dependence on both the modal spectra of the signal and noise and array resolution in mode domain.
43.30.Bp Normal mode propagation of sound in water
$^1$Lobachevsky Nizhni Novgorod National Research University\
$^2$Federal State Budgetary Scientific Institution "Federal Research Center The Institute of Applied Physics of the Russian Academy of Sciences" (IAP RAS)
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.