摘要
针对鱼雷、空投浮标、火箭助飞深弹等反潜武器入水瞬间产生的水声瞬态信号所具有的持续时间短、信噪比低、突发和不稳定等特点,以传统的Page-T est检测器为基础,提出了一种新的水声瞬态信号检测方法.该方法首先对采集的水声信号进行小波去噪,去除信号中的随机频谱成分,提高信噪比,然后利用Page-T est检测器进行检测.仿真结果表明,该方法可在低信噪比条件下有效地提取出瞬态信号的起始位置,其处理效果明显优于传统的Page-T est检测方法.
Aiming at the characteristics of underwater acoustic transient signals emitted from antisubmarine weapons dropping into water （torpedo, aerial sonobuoy and rocket assisted depth charge etc. ）, such as short duration, low SNR, abruptness and instability, a new method for detecting underwater acoustic transient signals is proposed based on the traditional page-test detector. Firstly wavelet transform is used to de-noise the signal removing random spectrum components and improving SNR. Then the page--test detector is adopted to detect the transient signal. The simulation results show that the method can effectively extract the starting location of the transient signal at low SNR, and that its performance is markedly superior to that of the traditional Page-Test detecting method.
出处
《测试技术学报》
2008年第2期160-165,共6页
Journal of Test and Measurement Technology
基金
国家自然科学基金资助项目(60572161)
高等学校全国优秀博士学位论文作者专项资金资助项目(200237)
关键词
水声对抗
瞬态信号
小波去噪
鱼雷
空投浮标
underwater acoustic countermeasure
transient signal
wavelet de-noising
torpedo
aerialsonobuoy
