Weak echo signal enhancement detection of underwater targets based on stochastic resonance

被引：0
|
作者：
Liu, Zhen [1 ,2 ]
Sun, Chun [1 ,2 ]
Zhou, Shengzeng [1 ,2 ]
Du, Xuanmin [1 ,2 ]
Sun, Delong [1 ]
机构：
[1] Shanghai Marine Electronic Equipment Research Institute, Shanghai
[2] Science and Technology on Underwater Acoustics Antagonizing Laboratory, Shanghai
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2024年 / 45卷 / 10期
关键词：
active sonar; clutter suppression; detection of underwater target; doppler shift; low signal to noise ratio; nonlinear bistable system; stochastic resonance; weak signal detection;
D O I：
10.11990/jheu.202207063
中图分类号：
学科分类号：
摘要：
To solve the problem of detecting weak echo signal of underwater targets by active sonars at a very low signal to noise ratio (SNR), this study proposes a weak echo signal enhancement detection method based on stochastic resonance (SR). In this method, a frequency-shifted and re-scaling stochastic resonance system is established to match the weak high-frequency echo signal and random noise to output an enhanced weak echo signal. Furthermore, an enhancement detection index based on the product spectrum and spectral kurtosis is constructed to effectively improve the energy concentration of the weak echo highlight, and suppress the interference of clutter and false components. The simulation results show that at a low input SNR, the output SNR gain of the stochastic resonance system can reach more than 5 dB. The detection results of weak target echo highlights are more intuitive and convenient, and the clutter interference is greatly suppressed. The effectiveness and reliability of the proposed method are further verified by the processing results of sea experimental data. © 2024 Editorial Board of Journal of Harbin Engineering. All rights reserved.
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页码：2014 / 2024
页数：10
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