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Article title DETECTION OF ACOUSTIC STEALTH MARINE OBJECTS BY SONAR LUMINAL SYSTEMS USING PHASE RECEIVING AND PROCESSING SIGNALS METHOD
Authors M.V. Mironenko, S.V. Shostak, P.A. Starodubtcev, E.N. Baklanov, A.P. Shevchenko
Section SECTION IV. HYDROACOUSTICS AND UNDERWATER ROBOTICS
Month, Year 04, 2016 @en
Index UDC 534.222
DOI
Abstract The article focuses on regularities in formation of the spatial structure of an acoustic luminal field in a long hydroacoustic channel. Technical processes of phase reception and proceeding of luminal signals providing the effective detection of acoustic almost invisible marine objects in environmental noise pickup and multipath propagation are developed. Measurement technologies of nonlinear luminal hydroacoustics, based on the phase reception and processing of space-time amplitude-phase structure of luminal acoustic field, adapted to the multipath propagation of luminal signals and to environmental noise pickup are presented. The results of the measurement of luminal signal related to the reference signal on the hundreds kilometers sonar barrier line had been analyzed. It is proved that the spectral processing of the phase difference of luminal signals from spatially separated single receivers is providing effective noise suppression and reliable signal selection of the noise emission of a moving object. The reasoning of noiseproof receiving of luminal acoustic waves under extended sonar multipath channel is given. It is based on a diagram of signal propagation to the receiving antenna in the form of two beams, the basic energy carriers. Block diagrams of the signal processing made by this method and the spectrogram of parametric signals measurements are given. The mathematical expression patterns of mutual phase modulation of luminal and information waves and their processing for implementing in luminal monitoring systems are obtained. Physical and mathematical justification given for far parametric reception of hydrophysical fields of marine sources by low-frequency sonar luminal method in conditions of an extended channel multipath propagation.

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Keywords Luminal monitoring system; spatial structure of a luminal field; hydroacoustic channel; phase receiving and processing of signals
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