A multi-channel composite test method for low-frequency target characteristic test

By employing a multi-channel composite testing method, utilizing multi-level expansion theory and Green's function matrix, and combining water, interface, and seabed channel data, the frequency limitations and high costs of low-frequency target acoustic radiation characteristic testing were resolved, achieving stable measurement of low-frequency target characteristics.

CN122408946APending Publication Date: 2026-07-17OCEAN UNIV OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OCEAN UNIV OF CHINA
Filing Date
2026-06-10
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies face difficulties in testing the acoustic radiation characteristics of low-frequency targets in deep-sea environments, and the size limitations of anechoic pools prevent the testing of very low-frequency signals. Measurement methods in shallow-sea environments suffer from frequency limitations and high costs.

Method used

A multi-channel composite testing method is adopted, which describes the target under test as a multi-order pole by multi-level expansion theory. Combined with Green's function matrix and regularization technology, the low-frequency radiation characteristics of the target are obtained by using data from water body, interface and seabed channel receivers.

Benefits of technology

It enables stable and reliable measurement of low-frequency target acoustic radiation characteristics in shallow sea environments, reduces testing costs, solves the frequency limitation problem, and is applicable to underwater platforms such as vertical array buoys and submersible moorings.

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Abstract

The application discloses a kind of multi-channel composite test methods for low-frequency target characteristic test, comprising the following steps: step 1: according to the theory of multi-stage development, the target to be tested is described as the linear superposition of multiple poles, and a multipole moment matrix equation of the target to be tested is constructed; the Green function matrix containing each order pole is constructed in combination with the test environment information;Step 2: according to the data received by different receivers in the water channel, the interface channel and the seabed channel, the received signal vector containing the overall low-frequency information of the target is obtained through multi-channel signal decoupling and information fusion technology;Step 3: in the process of solving multiple moments, the unique solution of each order multiple moment is obtained by introducing regularization technique, and then the low-frequency target radiation characteristics represented by the linear superposition of multiple poles are obtained.The method of the application is used to obtain the radiation characteristics of the low-frequency target to be tested in free space according to the data of the receivers in different channels.
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