A dual-frequency signal-based active sonar target detection method

By transmitting acoustic signals at similar frequencies and using difference frequency signal processing, the problem of insufficient signal coherence and anti-interference ability of traditional active sonar in complex underwater environments has been solved, and efficient detection in complex environments has been achieved.

CN122110118APending Publication Date: 2026-05-29THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
Filing Date
2026-01-14
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional active sonar systems are susceptible to the Doppler effect in complex underwater environments, resulting in reduced signal coherence, weak anti-interference capabilities, and limited detection performance.

Method used

Two acoustic signals with similar frequencies are used for detection. The difference frequency signal is used for signal processing. The temporal coherence of the signal is extracted and enhanced by methods such as short-time Fourier transform and matched filtering, which suppresses noise interference and improves signal energy accumulation.

Benefits of technology

It maintains high coherence and anti-interference capabilities in complex underwater environments, enhances detection performance and signal energy accumulation, and is suitable for military reconnaissance and underwater target identification.

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Abstract

The application discloses a kind of active sonar target detection methods based on dual-frequency signal, belong to underwater acoustic detection technical field, this method includes emitting two frequency similar acoustic wave signals;Receive target echo and pre-process;Nonlinear transformation is carried out to echo signal to produce difference frequency component containing two frequency difference values;Extract the difference frequency component;Difference frequency signal is carried out time-frequency analysis and long time integration to improve signal-to-noise ratio;Based on enhanced signal, target detection is completed, the present application utilizes the characteristics of low frequency, high time coherence and strong robustness to Doppler shift of difference frequency signal, breaks through the limitation of short coherence time of traditional single-frequency signal, realizes long-time effective energy accumulation, improves the detection distance, detection probability and anti-interference performance of active sonar in complex underwater environment, and at the same time enhances the concealment of sonar operation.
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