On Improving the Efficiency of Spatial Processing of Tonal Acoustic Signals in Oceanic Waveguides with Wind Waves

The possibility of increasing the efficiency of spatial processing of tonal signals in acoustic waveguides with wind waves is investigated. It is shown that preliminary frequency filtering of the signal in a narrow band in combination with known spatial processing algorithms allows to significantly increase the gain of the horizontal antenna array (AA). The main idea of the proposed spatio-temporal signal processing is to suppress the incoherent component of the acoustic field during frequency filtering of the signal. An algorithm for calculating the correlation matrix of the signal based on the transfer equation for the spatio-temporal coherence functions of complex amplitudes of acoustic modes is proposed. The results of numerical modeling of the gain factors for various signal processing algorithms in a sound channel with winter-type hydrology are obtained. The dependences of the gain factors on the distance, wind speed, bottom parameters, noise model and AA orientation are analyzed. The main attention is paid to comparing the results with and without frequency filtering.