A high-resolution imaging method and system based on conformal array sonar for small underwater moving targets

By using a segmented array of conformal arrays and a deconvolution algorithm, the problem of unclear sonar images of small moving underwater targets was solved, achieving high-precision imaging and high resolution, thus improving the quality of sonar images.

CN120214806BActive Publication Date: 2025-11-14INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202510262593.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-06
Publication Date
2025-11-14
Estimated Expiration
2045-03-06

AI Technical Summary

Technical Problem

In existing technologies, the linear cosine window function weighting method leads to beam main lobe broadening in underwater moving small target sonar, reducing the azimuth resolution and detail of the sonar image. Furthermore, conventional deconvolution methods cannot be applied to transducer arrays with baffles.

Method used

By employing a segmented array of conformal arrays combined with a deconvolution algorithm, the number of array elements and point spread function of a single beamforming are estimated to perform sector division and high-resolution imaging. The original beam domain data is obtained using conventional beamforming methods and then combined with the deconvolution algorithm for imaging.

Benefits of technology

It improves the clarity and resolution of conformal array sonar images, achieves high-precision imaging, and has strong robustness.

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Abstract

This invention pertains to a method for underwater acoustic signal processing in the marine field, specifically relating to a high-precision imaging method and system for conformal array sonar based on small underwater moving targets. The method includes: obtaining the coverage range of a single element in the beam imaging direction using the parameter characteristics of the conformal transducer array; segmenting the sonar image according to the characteristics of the segmented array configuration, then dividing the entire sonar image into I sectors; estimating the angular coverage range of the sectors corresponding to the segmented array configuration; estimating the number of array elements participating in a single beamforming operation; and estimating the point spread function corresponding to each segment; acquiring the original beam domain data using conventional beamforming methods; and obtaining high-precision imaging based on the point spread function and a deconvolution algorithm. The method of this invention can achieve high-precision imaging of small underwater moving targets using conformal array sonar, exhibiting strong robustness.
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Citation Information

Patent Citations

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