Multi-beam synthetic aperture sonar three-dimensional imaging algorithm

Abstract

The invention provides a multi-beam synthetic aperture sonar three-dimensional imaging algorithm, which virtually synthesizes a large-aperture array in the track direction through the movement of a carrier according to a multi-beam synthetic aperture sonar transducer array structure, and distinguishes the echo arrival direction in the horizontal direction by using a multi-receiving array element structure. Through the motion of the carrier, the detection area is irradiated to different track direction positions, coherent compensation accumulation is carried out on received echo signals, and three-dimensional sonar image output under a track-slant distance-angle coordinate system can be obtained. And converting the sonar image into a three-dimensional sonar image which is easier to observeunder a horizontal track-to-depth coordinate system by utilizing coordinate transformation. According to the method, the mechanism limitation of multi-beam sounding sonar and conventional synthetic aperture sonar is broken through, constant imaging resolution is obtained in the track direction, high imaging resolution is obtained in the horizontal direction and the depth direction, and refined sonar imaging in the three-dimensional space is achieved.

Description

technical field [0001] The invention relates to a multi-beam synthetic aperture sonar three-dimensional imaging algorithm, which belongs to the field of sonar signal processing. Background technique [0002] For the development and utilization of marine resources, the first premise is to carry out refined detection of the topography of the underwater area and special targets of interest, with the technical requirements of large detection area, high refinement requirements, and strong anti-interference ability. Compared with the conventional optical imaging system, the imaging sonar system can perform long-distance detection under the conditions of low underwater visibility and turbid water quality, and has a wider range of applications. After decades of development and research, imaging sonar technology has experienced development from two-dimensional images to three-dimensional images, from single-point detection to multi-point detection, from single-carrier to multi-carrie...

AI Technical Summary

Problems solved by technology

The disadvantage is that the system is complex, the cost is extremely high, and there is still the problem of detecting gaps directly below. Usually, it is necessary to carry multi-beam sonar to fill the gaps

The disadvantage is that its track and horizontal imaging resolution will be limited by the beam footprint, which will decrease as the detection distance increases

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