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

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...

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