ACOUSTIC METHOD FOR MEASURING MOTION PARAMETERS OF THE LAYERED MARINE ENVIRONMENT Russian patent published in 2023 - IPC G01S15/60 

FIELD: hydroacoustics.

SUBSTANCE: invention relates to acoustic methods and instruments for measuring and recording the motion parameters of a layered marine environment by means of pulse echolocation by a polyharmonic ultrasonic signal emitted from the bottom to the water-air interface. The invention can be used to measure the flow parameters of a layered aquatic environment using an acoustic method based on information obtained by reflecting and scattering ultrasound from k layers of diffusers (bubbles, suspended particles, plankton, various inhomogeneities, etc.) having neutral buoyancy and passive carried by currents of water. Essence: in the method, the mode of measuring and recording the motion parameters of diffusers passively carried by k currents in a layered marine environment and selecting two pairs of electronic acoustic transducers (EAT), which in pairs are oppositely located at the intersections of a given parallel and two mutually perpendicular axial meridians of the hemispherical surface of the bottom RED, acoustic axes four EAT have the same angles of inclination relative to the horizon and are located in two mutually perpendicular vertical planes passing through the axis of symmetry of the bottom RED and projected onto the bottom in the form of X and Y axes; generate carrier oscillations with a frequency and emission using four EAT simultaneously pulses of ultrasonic waves that propagate in the direction of the selected four, oppositely located in pairs, sections of the "water - air" interface, forming four PRA in the aquatic environment, in the volumes of which nonlinear sources of the generated spectral components are distributed (self-action); generate four polyharmonic beams of ultrasonic signals with frequencies , where n=1, 2, 3, … - serial number of the harmonic; establish acoustic contacts with k layers of diffusers, which are distributed in four opposite water volumes located in pairs at i depth horizons and move at different speeds υ_{i layer} currents; choose the number i of layers of diffusers necessary for measurements, moving at different speeds υ_{i layer} of currents at i depth horizons in four oppositely located water volumes in pairs; set identical gating parameters in the receiving path; choose the i-th depth horizon to obtain data on the magnitude of the speed υ_{i layer} flow in the i-th layer of the aquatic environment.

EFFECT: increased efficiency of measurements and registration of motion parameters of the layered marine environment in a wide band of operating frequencies when irradiated with an ultrasonic signal emitted from the bottom.

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