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Small-size planar array three-dimensional beam forming method and device based on acoustic vector hydrophone and medium

A three-dimensional beam, plane array technology, applied in instrumentation, design optimization/simulation, radio wave measurement system, etc., to avoid vertical amplitude and phase errors

Pending Publication Date: 2022-06-28
HARBIN ENG UNIV
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Problems solved by technology

[0004] Aiming at the contradiction between array performance and array shape and size under current deep-sea low-frequency detection conditions, the present invention proposes a small-size planar array three-dimensional beamforming method, equipment and medium based on acoustic vector hydrophones

Method used

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  • Small-size planar array three-dimensional beam forming method and device based on acoustic vector hydrophone and medium
  • Small-size planar array three-dimensional beam forming method and device based on acoustic vector hydrophone and medium
  • Small-size planar array three-dimensional beam forming method and device based on acoustic vector hydrophone and medium

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Embodiment

[0114] The three-dimensional beam pattern required by the design is based on the maximum directivity factor, and the maximum spherical harmonic function order N=3 is designed, and the directivity angle is (θ d ,φ d ) of the 3D beam pattern, such as figure 2 shown as designed (θ d ,φ d ) = (45°, 45°) three-dimensional beam pattern.

[0115]

[0116] That is, after the designed three-dimensional beam pattern is expanded by spherical harmonics, the coefficient vector is composed of coefficients of spherical harmonics of each order.

[0117] According to the relationship between spherical harmonics and multipole modes, the spherical harmonics of each order are expanded into the form of multipole modes. For the spherical harmonic function Y with m≥0 n Multipole mode Ψ with m(θ,φ) and γ≤1 α,β,γ =(sinθcosφ) α (sinθsinφ) β (cosθ) γ The connection between can be expressed as:

[0118]

[0119] in, Yes constant coefficient of , represents the binomial coefficient...

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Abstract

The invention provides a small-size planar array three-dimensional beam forming method and device based on an acoustic vector hydrophone and a medium. The method comprises the following steps: firstly, designing a required three-dimensional beam pattern according to requirements, and performing series expansion on the designed beam pattern by a spherical harmonic function to obtain a coefficient of each order of spherical harmonic function; according to the relation between the spherical harmonic function and the multi-pole sub-modes, each order of spherical harmonic function is further decomposed into a series of multi-pole sub-modes, and the needed multi-pole sub-modes and the coefficient of each multi-pole sub-mode are determined; extracting a required multipole mode by using a finite difference technology, and determining an array shape and a coefficient of each receiving sensor; and finally, combining the obtained coefficients to obtain an array receiving channel weighted vector for synthesizing an expected beam pattern to realize three-dimensional beam forming. According to the method, vertical direction amplitude-phase errors introduced under the influence of deep sea waveguides are avoided, and the problem that an existing low-frequency small-size array is difficult to apply to detection in a deep sea three-dimensional space is solved.

Description

technical field [0001] The invention belongs to the technical field of sonar array signal processing, and in particular relates to a small-sized planar array three-dimensional beam forming method, device and medium based on an acoustic vector hydrophone. The invention relates to a three-dimensional beam forming method of a small-sized acoustic vector plane array in the low frequency range of 10-500 Hz. Background technique [0002] In the low frequency and very low frequency working section, the Rayleigh limit of traditional sonar design seriously restricts the detection performance of underwater sonar arrays, and the breakthrough in the research of small-scale arrays with array spacing far less than half wavelength provides a solution to this problem. . In recent years, super-directional beamforming methods based on small-sized sonar arrays have become a research hotspot. A large number of design analysis and computer simulations have shown the advantages of such arrays an...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F17/16G06F17/17G01S7/52
CPCG06F30/23G06F17/16G06F17/17G01S7/52
Inventor 郭俊媛朴胜春李良文张明辉
Owner HARBIN ENG UNIV
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