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  1. Article

    Open Access

    The Influence of the A Priori Uncertainty of the Shallow Sea Sound Channel Model on the Vertical Array Gain

    The purpose of this paper is to numerically demonstrate and comparatively analyze the critically strong and ambiguous impact of the a priori uncertainty of a shallow sea waveguide model in its main physical pa...

    A. I. Malekhanov, A. V. Smirnov in Acoustical Physics (2023)

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  2. No Access

    Article

    Array Acoustic Signal Processing in Shallow-Water Channels under Conditions of a Priori Uncertainty: Estimates of the Efficiency Loss

    The objective of this study is a comparative analysis of the efficiency of the matched-field and optimal spatial signal processing methods in a shallow-water sound channel under conditions of inaccurate knowle...

    A. I. Malekhanov, I. P. Smirnov in Acoustical Physics (2022)

  3. No Access

    Article

    Simulation of Spatial Coherence of a Multimode Signal and Response of a Horizontal Antenna in a Randomly Inhomogeneous Oceanic Waveguide

    We present simulation results for the spatial-coherence function of a multimode acoustic signal from a remote source in the horizontal plane of a randomly inhomogeneous oceanic waveguide and the angular respon...

    A. I. Malekhanov, A. V. Smirnov in Radiophysics and Quantum Electronics (2022)

  4. No Access

    Article

    Influence of Anisotropic Wind Waves on the Efficiency of Spatial Processing of Acoustic Signals in Shallow Water

    The authors investigate the effect of anisotropy of the frequency-angular spectrum of wind waves on the efficiency of spatial processing signals received by a horizontal array in a shallow water waveguide with...

    V. G. Burdukovskaya, A. I. Malekhanov, M. A. Raevsky in Acoustical Physics (2021)

  5. No Access

    Article

    Comparative Analysis of the Noise Immunity of Algorithms for Reconstructing Seabed Geoacoustic Parameters by the Coherent Sounding Technique

    Based on a previously developed numerical model, a comparative analysis of the efficiency of algorithms for reconstructing the geoacoustic parameters for a seabed with a layered structure is carried out based ...

    V. I. Kalinina, I. P. Smirnov, A. I. Khilko, A. I. Malekhanov in Acoustical Physics (2021)

  6. No Access

    Article

    Comparative Analysis of Horizontal Array Signal Processing in a Shallow-Water Channel with a Rough Windy Surface

    The recent study [1] addressed how the characteristics of low-frequency acoustic signal propagation in a shallow-water channel under wind wave conditions affect the output performance of a horizontal phased ar...

    N. A. Zavolskii, A. I. Malekhanov, M. A. Raevskii in Acoustical Physics (2019)

  7. No Access

    Article

    Effects of wind waves on horizontal array performance in shallow-water conditions

    We analyze the influence of statistical effects of the propagation of an acoustic signal excited by a tone source in a shallow-water channel with a rough sea surface on the efficiency of a horizontal phased ar...

    N. A. Zavol’skii, A. I. Malekhanov, M. A. Raevskii, A. V. Smirnov in Acoustical Physics (2017)

  8. No Access

    Article

    Coherent marine seismoacoustics: New approaches to reconstructing bottom layer structures in shelf water areas

    Results from the theoretical development and experimental study of the coherent seismoacoustic sounding of the sea floor under natural conditions are discussed. Ways of solving the inverse problem of estimatin...

    V. I. Kalinina, A. I. Malekhanov… in Bulletin of the Russian Academy of Science… (2017)

  9. No Access

    Article

    New evidence of acoustic effects of radiation impacts in deep wells

    Passive seismic observations were performed in the Vorotolovskaya deep well in Nizhny Novgorod oblast at a depth of 1400 m and in a well in the vicinity of Ufa at a depth of 500 m. Observations show significan...

    A. S. Belyakov, I. N. Didenkulov, A. D. Zhigalin, V. S. Lavrov… in Doklady Earth Sciences (2017)

  10. No Access

    Article

    A new method for reconstructing medium inhomogeneities using Rayleigh waves: Case studies

    The problem of reconstructing local low-contrast inhomogeneities in the Earth’s surface layers by means of coherent Rayleigh surface waves is considered. It is shown that analysis of the frequency characterist...

    V. S. Averbakh, N. N. Gribov, A. I. Konkov… in Bulletin of the Russian Academy of Science… (2016)

  11. No Access

    Article

    A physical basis for designing integrated acoustic network systems for underwater observations

    A concept for designing network systems for underwater observations based on the joint development of hydroacoustic radiating and receiving elements integrated with different channels of communication is discu...

    V. G. Peshekhonov, A. I. Mashoshin… in Bulletin of the Russian Academy of Science… (2016)

  12. No Access

    Article

    Estimation of efficiency of vertical antenna arrays in underwater sound channels

    The gain of the vertical antenna array in a randomly inhomogeneous ocean waveguide is numerically simulated on the assumption that the useful signal is generated by a finite set of mutually uncorrelated discre...

    M. S. Labutina, A. I. Malekhanov, A. V. Smirnov in Physics of Wave Phenomena (2016)

  13. No Access

    Article

    Matched field signal processing in underwater sound channels (Review)

    The state of the art of matched field hydroacoustic signal processing is described from the viewpoint of estimating the signal parameters in adaptive antenna arrays. The focus is on methods for solving the pro...

    A. G. Sazontov, A. I. Malekhanov in Acoustical Physics (2015)

  14. No Access

    Article

    Coherent seismic sea-bottom profiling based on broadband signals

    Experimental results of the seismic profiling with bottom penetration up to 1000 m based on broadband signals and conducted in the Caspian Sea sites are presented. Use has been made of synchronized sequences o...

    V. A. Lazarev, A. I. Malekhanov, L. R. Merklin, V. I. Romanova, V. I. Talanov… in Oceanology (2013)

  15. No Access

    Article

    Reconstructing parameters of sediment layers of a shallow sea bottom using broadband seismoacoustic sources

    We study the possibilities of reconstructings the parameters of the sediment layers of a shallow sea bottom from interference patterns appearing during sounding of the bottom by broadband seismoacoustic source...

    A. V. Grinyuk, V. N. Kravchenko, V. A. Lazarev, A. I. Malekhanov… in Acoustical Physics (2013)

  16. No Access

    Article

    Experimental study of mode selection in shallow-water sea

    The possibilities of matching low-frequency underwater sound pulses to the parameters of an oceanic waveguide are considered. The objective is to optimize the system of few-mode tomographic observation in a sh...

    A. V. Grinyuk, V. G. Burdukovskaya, V. A. Zverev, V. N. Kravchenko… in Acoustical Physics (2012)

  17. No Access

    Article

    Experimental investigation of potentialities of seismoacoustic sea-bottom sounding using coherent pulse signals

    We describe the results of experimental investigations of the seismoacoustical sounding of the bottom structure of the Caspian Sea. They were obtained using a ship towed hydroacoustic emitter of LFM pulse sign...

    V. A. Lazarev, A. I. Malekhanov, L. R. Merklin, V. I. Romanova… in Acoustical Physics (2012)

  18. No Access

    Article

    High-frequency acoustical observation of inhomogeneities in shallow water oceanic waveguides with an irregular bottom in the presence of strong reverberation

    Possibilities of high-frequency acoustical underwater observations of small-size objects in marine shelf zones are experimentally investigated using vertical and horizontal arrays radiating and receiving compl...

    A. V. Grinyuk, V. N. Kravchenko, A. T. Trofimov, O. I. Trusova… in Acoustical Physics (2011)

  19. No Access

    Article

    The spatio-temporal structure of wideband acoustic pulses in shallow sea

    We study the influence of a bottom-sediment layer on the spatio-temporal structure of wideband acoustic pulses in shallow sea. The shallow sea is modeled as a uniform liquid layer above a layer of liquid sedim...

    E. L. Borodina, A. I. Malekhanov, A. I. Khil’ko in Radiophysics and Quantum Electronics (2011)

  20. No Access

    Article

    Experiments on excitation and receiving of coherent high-frequency acoustic signals in a shallow-water region of a marine shelf

    Possibilities of formation of coherent high-frequency signals for underwater acoustic observations in shallow-water shelf zones of the ocean with an irregular bottom are experimentally investigated. The method...

    A. V. Grinyuk, V. N. Kravchenko, A. T. Trofimov, O. I. Trusova… in Acoustical Physics (2011)

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