随机共振技术在探潜中的应用

The application of stochastic resonance technique in detecting submarine

潜艇在低速航行时,由于辅机的工作和螺旋桨转动,导致了声频在甚低频段（0～100 Hz）内有较强的线谱.在声源较弱时,由于信噪比太低,传统的Demon谱分析方法无法辨别出线谱成分.这在一定程度上限制了声呐在低信噪比情况下的探潜性能.根据随机共振理论的非线性检测目标手段,运用扫频式随机共振技术,对低信噪比情况下的潜艇线谱噪声进行处理,从而增强了线谱能量,以提高检测信噪比.根据该理论,运用扫频随机共振方法对潜艇甚低频段线谱进行了数据处理,使得检测结果提高了8dB,实际运用的目标检测距离提高1倍以上.充分体现了该理论的工程实用价值.

When navigation of submarine in.For a low speed submarine,propeller running and assisting machine working produce linear spectrums between 0Hz and 100Hz.If the acoustic source is weak,the signal and noise ratio decomes very low,the traditional demon spectrum analysis method for analyzing signal can not find the linear spectrums.This restricts the capacity to find submarine.Stochastic resonance theory is a nonlinear way of detecting target.Based on stochastic resonance theory and using scan frequency technique for stochastic resonance,the power of linear spectrum can be increased and the signal and noise ratio advanced.According to the theory,the data of submarine were processed to incease the signal and noise ratio by 8 dB,and the practical detecting distance was double that of before.