A method and device for underwater sound source detection and positioning based on deep sea multipath focusing

By adopting a multi-path focusing method in the deep-sea sound field and using spatial power spectrum estimation and phase compensation technology, the problem of insufficient detection and positioning ability of low signal-to-noise ratio signals in the deep-sea sound field is solved, and effective detection and positioning of weak sound sources are achieved.

CN118859114BActive Publication Date: 2025-04-04INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202411119049.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-15
Publication Date
2025-04-04
Estimated Expiration
2044-08-15

AI Technical Summary

Technical Problem

The prior art lacks real-time detection and positioning capabilities of low signal-to-noise ratio signals in deep-sea sound fields, especially when the arrival angle of direct sound source waves and reflected waves on the sea surface cannot be obtained, the method fails.

Method used

The underwater sound source detection and positioning method based on deep-sea multi-path focus is used to calculate the beam output sound field through the spatial power spectrum estimation method, and the focusing of the multi-path sound field is achieved by phase compensation addition. Finally, the distance and depth of the target sound source are determined by comparison of template values.

Benefits of technology

The detection and positioning ability of underwater weak sound sources in multiple environments is improved, and effective processing and real-time detection of low signal-to-noise ratio signals are realized.

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Abstract

The present invention relates to the field of underwater acoustic engineering technology, and discloses a method and device for underwater sound source detection and positioning based on deep-sea multipath focusing. The method comprises: using a spatial power spectrum estimation method to calculate the beam output sound field of the sound pressure signal radiated by the target sound source at different azimuth angles at different frequency points within a set frequency range; for any frequency point, performing phase compensation and addition on the beam output sound field of the frequency point at two different azimuth angles according to different assumed arrival delays to obtain a focusing result; adding the multipath sound field focusing results of multiple frequency points to obtain a broadband multipath three-dimensional sound field focusing result; comparing the two angles and arrival delays corresponding to the maximum value of the broadband focusing result with the template values ​​under different assumed target distances and depths to determine the estimated value of the target sound source distance and depth. The coherent superposition detection of deep-sea multipath path signals is realized, and the detection and positioning capability of underwater weak sound sources in a multipath environment is improved.
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