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Hyperfine three-dimensional imaging method based on acoustic orbital angular momentum

A technology of orbital angular momentum and three-dimensional imaging, which is applied in the field of marine acoustic equipment, can solve the problems of limiting the improvement of imaging resolution, extremely high hardware requirements, and large data volume, so as to reduce the number of array elements, reduce the number of array elements, The effect of reducing system complexity and cost

Pending Publication Date: 2020-12-15
天津水聿方舟海洋工程技术有限公司
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AI Technical Summary

Problems solved by technology

A large number of array elements will lead to a large amount of collected data, extremely high hardware requirements, and very high cost
In addition, if you want to further improve the imaging resolution, you need more array elements, which limits the improvement of imaging resolution

Method used

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  • Hyperfine three-dimensional imaging method based on acoustic orbital angular momentum
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  • Hyperfine three-dimensional imaging method based on acoustic orbital angular momentum

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Embodiment Construction

[0031] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0032] A hyperfine three-dimensional imaging method based on acoustic orbital angular momentum, comprising the following steps:

[0033] Step 1. Construction of acoustic orbital angular momentum ultra-fine three-dimensional imaging sonar.

[0034] The acoustic orbital angular momentum ultra-fine three-dimensional imaging sonar is composed of a transducer array and a signal processing circuit board, such as figure 1 As shown, the transducer array includes a circular array and a helical array. The annular array is arranged at equal intervals on a circle with a radius a of N independent transceivers and displacers; the spiral array is arranged in the annular array, and the spiral array is in a garden with a radius of a M receiving transducers are spirally arranged; with the center of the circle as the coordinate origin, all arrays are located on th...

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Abstract

The invention relates to a hyperfine three-dimensional imaging method based on acoustic orbital angular momentum. The method is characterized by comprising the following steps of: constructing an acoustic orbital angular momentum hyperfine three-dimensional imaging sonar; emitting a vortex sound field by the acoustic orbital angular momentum hyperfine three-dimensional imaging sonar and receivingecho signals reflected by a remote target; respectively carrying out primary beam forming on a pitch angle and an azimuth angle to obtain a series of two-dimensional sonar image slices in the area, and synthesizing the series of slices in the distance direction to obtain three-dimensional sonar imaging; and respectively carrying out secondary beam forming on the pitch angle and the azimuth angle to obtain a hyperfine image. The method is reasonable in design, utilizes the vortex sound field carrying the acoustic orbital angular momentum for detection, can provide richer echo information compared with plane wave or spherical wave detection, and the imaging resolution can be remarkably improved while the number of array elements is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of marine acoustic equipment, and relates to a three-dimensional imaging sonar technology, especially an ultra-fine three-dimensional imaging method based on acoustic orbital angular momentum Background technique [0002] With the development of marine technology, people pay more and more attention to the technology of underwater perception. Since electromagnetic waves and light decay very quickly in water, sound wave detection is the main way of underwater perception. Sonar is an acoustic detection device widely used in various tasks such as underwater navigation, positioning, ranging and target tracking. In imaging sonar, the acoustic image obtained by two-dimensional imaging sonar only contains distance and azimuth information. However, the object shapes in reality are mostly three-dimensional. In the process of underwater imaging, if the received acoustic signal is processed to form the spatial three-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/89
CPCG01S15/89G01S15/8993G01S7/5202G01S15/8922G01S15/8925G01S7/52047
Inventor 李胜全葛铮曹津舫夏启兵
Owner 天津水聿方舟海洋工程技术有限公司
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