【摘要】 在海洋中,海水的流动噪声很大,水听器接收到的被测船体的信号往往是信噪比很低的微弱信号.一般的时域检测系统,可检测的信号的最低信噪比门限难以达到-20dB,并且检测时间较长.介绍一种配置混沌振子的光纤水听器系统,利用混沌振子对被测周期小信号的敏感性和对噪声的免疫力,获取水声信号.与时域检测方法(如多点采样积分方法)相比较,具有更低的最低信噪比门限,和更短的测试时间.更多还原

【Abstract】 At sea,the water flowing noise is strong,so the received ship signal by a hydrophone is often weak,i.e.its signal-noise ratio is low.Generally, for a measurement system working in time domain,its lowest signal-noise threshold cannot be lowed down to-20dB.And the measurement costs much time.A fiberoptic hydrophone matched with chaos is introduced.Its sensitivity to weak cycle signal and resistance to noise are used to detect hydro-sound signal.In comparison with traditional measurement method in time domain(e.g.sampling and averaging method),it has lower signal-noise threshold,as well as shorter measurement time.更多还原