Article

Article title POSSIBILITY OF DETERMINATION OF SOUND VELOCITY VARIATION THE IN WATER-SATURATED SEDIMENTS BY VERTICAL SONAR SENSING
Authors V.I. Kaevitser, S.P. Tarasov, A.I. Zakharov, I.V. Smolyaninov, G.V. Soldatov
Section SECTION I. ACOUSTICS AND HYDROACOUSTICS
Month, Year 12, 2015 @en
Index UDC 551.463.621.391
DOI
Abstract The possibilities of remote sensing of bottom soil and water layer variations and direct measurements their acoustic properties in phase analysis of echo signals of sounders and profilers with highly directional radiation in vertical acoustic sounding scheme are discussed and respective techniques are proposed. It will allow to receive qualitatively new information on not uniformity of water and ground soil and possibility of their more exact classification. The order of receiving distribution of the reflected sonic depth finder signal on delay is considered. The difference of phases of signals of the next counting is determined by distinction in time of delay of signals. Communication of a difference of phases of signals of the next counting with sound speed in a non-uniform layer is revealed. It is considered application of the described method for obtaining one more classification characteristic - definition of possible dispersion of speed of a sound in ground deposits. For realization of the offered method it is necessary to create a special two- frequency signal. The algorithm of separate processing of echo signals from the lower and top half of a range of the radiated signal LChM was applied to experimental realization of coherent two frequency soundings of a bottom. Experimental results of application of the developed techniques for remote definition of changes of speed of a sound in water and ground deposits are given. For research of informational content of phase characteristics of echo signals of a profilograf at classification of ground deposits distribution on range of an increment of a difference of phases of signals separately for "low-frequency" and "high-frequency" range was analysed. Information on attack on delay (derivative) difference of phases between echo signals on the acoustic images received when using "high-frequency" and "low-frequency" components of the probing signal is received. The received results indicate nonrandom character of the measured sizes, they open possibility of formation by means of statistical processing of new steady signs for remote classification of ground deposits. Experimental for research of variations of speed of a sound in a near-surface sheet of water high-quality coincidence of changes of speed of a sound by the offered technique with measurements of speed of a sound by means of the specialized submersible device which is carrying out measurements in the contact way allowed to reveal applications of phase methods. The directions of further researches for realization of the developed techniques in essentially new perspective measuring systems of remote sensing of the water environment and ground deposits are planned.

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Keywords Acoustic remote sensing; classification of probing media; echo sounders; sonar profilers; chirp modulation; digital echo signals processing; phase analysis of echo signals.
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