Possibilities of noise filtering in interferometric processing of hydroacoustic signals

Hydroacoustic signals constitute a complex mixture of a useful signal combined with noises and interferences of various origins. The most energetically significant noises are introduced by the propagation medium, whose characteristics vary dynamically. This creates particular difficulty in extracting the useful component from the received signal mixture. The issue of effective filtering of a hydroacoustic signal continues to require the search for and verification of new approaches. To consider an approach to constructing a linear filter for processing a hydroacoustic signal using an interferometric approach, to investigate its capabilities, and to evaluate its efficiency in improving the signal-to-noise ratio at the output relative to the input. By means of a numerical experiment, for a wide range of receiver parameters (frequencies and observation times), source parameters (distances and velocity values), and interference conditions, estimates of the efficiency of the proposed filter were obtained, and the result was verified against an analytical estimate. The high efficiency of the interferometric approach for filtering a hydroacoustic signal under extremely unfavorable interference conditions is demonstrated.