With the modern ship radiation noise spectrum significantly reduced, the intensity of the underwater acoustic sig-nal received by the passive sonar is correspondingly reduced. In the case of distant sea, the actual received signal to noise ra-tio is very low. The conventional linear detection method can achieve good detection effect under the condition of high signal-to-noise ratio. However, when the signal-to-noise ratio is very low, the target signal is almost completely submerged by strong noise, and the detection effect is extremely poor, greatly reducing the detection probability. In this paper, the bistable Stochastic Resonance of the nonlinear processing method is used to detect the underwater acoustic signal. The experimental results show that the proposed method can detect the target signal with low SNR (-20 or even-30dB) Method, which can break the shackles of very low SNR, and has a good application prospect and research value.%随着现代舰船辐射噪声谱级的大幅降低,被动声呐所接收到的水声信号的强度也相应降低.在远海情况下,实际接收到的信号信噪比都是很低的.常规的线性检测方法在高信噪比情况下都可以取得很好的检测效果,但是在信噪比很低的情况下,目标信号几乎被强噪声完全淹没,检测效果极差,大大降低了检测概率.将非线性处理手段双稳态随机共振引入水声信号的检测,通过实验仿真验证了该方法可以实现低信噪比(-20dB甚至-30dB)情况下的目标信号的检测,对比常规检测方法,该方法可以突破极低信噪比的束缚,具有很好的应用前景及研究价值.
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