摘要
水声脉冲信号是由一个运动平台上的发射器发射的。信号的调制方式、载频、幅度、脉宽以及周期均为未知。该文介绍了一种水声脉冲信号检测的新方法。水声脉冲信号接收机输出的短时谱重心是不断起伏的。起伏在高信噪比时会变得很小,而在低信噪比(或无信号)时会变得很大。由于,起伏的绝对偏差移动平均可用来度量起伏的大小,因此,它可以被用来检测水声脉冲信号。还介绍了新检测方法的原理、算法以及仿真结果。在海洋噪声、运动载体的辐射噪声以及小的多途干扰背景中,该方法能可靠地检测水声脉冲信号,并能同时对信号的一些参数作出估计。
The underwater acoustic pulse signal is transmitted by a projector on a moving platform.The modulation mode,carry frequency,amplitude,pulse width and period of the signal are all unknown.A new method for the detection of the underwater acoustic pulse signal is described in the paper.The centroid of the short-time spectral of the output of underwater acoustic pulse signal receiver fluctuates all the time.The fluctuation has a small value when SNR is large,and a large value if SNR is small（or no signal）.Since the moving-smooth of the absolute deviation is a measure of the fluctuation,so it can be used to detect the underwater acoustic pulse signal.The principle,algorithm and simulation results of the new detection method are also presented.In the background of ocean-noise,radiation noise of the moving platform and small multi-path-interference,the underwater acoustic pulse signal can be detected reliably.Some parameters of the signal can be estimated at the same time too.
出处
《声学技术》
CSCD
2012年第1期19-23,共5页
Technical Acoustics
关键词
水声脉冲信号
一阶谱矩
谱重心
短时谱重心
短时谱重心的起伏
绝对偏差的移动平滑
underwater acoustic pulsing signal
first spectral moment
spectral centroid
short-time spectral centroid
fluctuation of short-time spectral centroid
moving-smooth of absolute deviation
