The article presents the results of a theoretical study of the effect of random internal waves and wind waves on the gain of a vertical antenna array (AA) in shallow water. An algorithm is proposed for calculating the correlation matrix of the signal at the AA aperture under conditions of the combined effect of the background of internal waves and surface waves, using the separation of fluctuations of acoustic modes into high- and low-frequency components. This takes into account intermode correlations, that is, the interference structure of the acoustic field in the waveguide. For a waveguide with summer hydrology, a numerical modeling of the vertical function of signal coherence and the gain of the AA depending on its distance from the source has been performed. At the same time, for comparison, various methods of spatial signal processing are used: the PHAR method and optimal algorithms (linear and quadratic). The influence of the background of internal waves on the AA gain coefficient as a function of the acoustic parameters of the seabed, is discussed. The results of numerical modeling the gain of a vertical AA under the combined influence of the background of internal waves and wind waves are also analyzed.
Raevski et al. (Wed,) studied this question.