RU2011130315A - HYDROACOUSTIC COMPLEX FOR MEASURING THE AZIMUTAL ANGLE ON THE SOURCE SOUND IN A SHALLOW SEA - Google Patents

Claims (1)

A hydro-acoustic measuring complex containing n acoustic combined receivers, each of which consists of a hydrophone, a three-component vector receiver and amplifiers connected to them, a telemetry unit, the input of which is connected to the output of the acoustic combined receivers, including voltage dividers, an analog-to-digital conversion circuit, a single circuit electronic multiplexing, modulator and optical emitter, connected by an optical line of communication with an optical receiver, a collection system, processing information transfer and transmission, comprising a unit for collecting, processing and transmitting information, the input of which is connected to the output of the optical receiver, and an access device to digital data networks, the input of which is connected to the output of the unit for collecting, processing and transmitting information, characterized in that in the measuring complex through three acoustic combined receivers P1, P2, P3, a bottom orthogonal base is formed in which the base distance L _x between the receivers P1, P2 is oriented along the X axis, the base distance L _y is equal to the projection the distances between the receivers P1, P3 on the Y axis of the local orthogonal coordinate system, and the base distances are selected from the condition L _x ≥H ² / λ, L _y ≥H ² / λ (H - sea depth; λ is the wavelength at the middle frequency of the operating frequency range), a three-channel unit for calculating the vertical components of the intensity vector, the input of which is connected to the output of the unit for collecting, processing and displaying information, the first unit for calculating the cross-correlation function K ₁₂ (τ) signal input coupled to the outputs of the first and second channels of the unit calculating the intensity of the vertical component of the vector, a second unit calculating a cross-correlation function ₁₃ (τ) signal input coupled to the outputs of the first and third intensity calculation unit channels calculating unit maximum cross correlation functions having an input coupled to the outputs of computing cross correlation functions of blocks, the block calculating the azimuth angle of the sound source with respect to X-axis, the input of which connected to the output of the unit for calculating the maximum of cross-correlation functions, and the output is connected to the input of the access device to digital data networks, and the cross-correlation functions are calculated by rumulam

,

, and the azimuthal angle to the sound source relative to the X axis of the local orthogonal coordinate system is calculated by the formula:

, where τ = t _x is the time delay corresponding to the maximum of the cross-correlation function K ₁₂ τ = t _y is the time delay corresponding to the maximum of the cross-correlation function K ₁₃ ; C is the predefined effective speed of sound in the marine environment; S _i (ω, r _i ) = p (ω, r _i ) V _z ^* (ω, r _i ) is the spectral density of the vertical power flow; p (ω, r _i ), V _z (ω, r _i ) - Fourier transforms of sound pressure and the vertical components of the vibrational velocity vector; r _i is the distance from the sound source to the combined acoustic receiver P _i ; ω0, 2Δω is the average circular operating frequency and the operating frequency range of the sound source; L _x = (П1-П2), L _y = (П1-П3) sinθ, θ is the angle between the segments П1-П2 and П1-П3.