Active sonar target joint detection tracking method fusing CW and LFM waveforms

By fusing CW and LFM waveforms in active sonar, combined with Doppler speed and channel multi-path characteristics, joint detection and tracking of targets is achieved, solving the problem of poor target detection and tracking performance in the existing technology in harsh environments, and improving detection and tracking performance.

CN119738825AActive Publication Date: 2025-04-01INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202411626645.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-14
Publication Date
2025-04-01
Estimated Expiration
2044-11-14

AI Technical Summary

Technical Problem

In the harsh water acoustic environment or interference conditions, it is difficult for existing active sonar to fully utilize the advantages of CW waves and LFM waves to conduct joint detection and tracking of targets, resulting in poor target detection and tracking performance.

Method used

An active sonar target joint detection and tracking method is proposed that combines CW and LFM waveforms. By sequentially transmitting CW and LFM waves, receiving echo data, performing power spectrum estimation, target line spectrum detection, and replica-related peak detection, combining Doppler velocity and channel multi-path characteristics to achieve joint detection and tracking of the target.

Benefits of technology

The active sonar target detection and tracking performance in distorted water acoustic environments such as multi-way and Doppler extension is improved, and the robust detection and tracking of high-speed maneuvering targets is achieved.

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Abstract

The invention discloses an active sonar target joint detection tracking method fusing CW and LFM waveforms. The method comprises the steps that 1) CW waves and LFM waves are sequentially transmitted and received; 2) power spectrum estimation and target line spectrum detection are carried out based on CW echoes, when a target line spectrum is detected, a target Doppler velocity and a target distance are obtained, and target line spectrum detection credibility is estimated; (3) replica correlation peak detection is carried out based on the LFM echoes and the LFM waveform replica, and if the replica correlation peak detection is detected, the target distance, the target echo correlation peak detection credibility and the channel multipath characteristic are estimated; 4) the target line spectrum detection credibility and the target echo correlation peak detection credibility are compared with respective threshold values, and the target tracking speed and the target position are determined; 5) if no target is detected, judging whether an active target tracking trajectory exists or not, and if yes, estimating a current tracking distance and a current tracking speed; otherwise, turning to the step 2) until the target is captured again.
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