摘要
本文讨论在海中传播的舰船辐射噪声线谱和海洋环境噪声的幅度起伏模型。当线谱信号模型取正弦波加窄带高斯噪声时，窄带检测系统的输出起伏满足２ＢＴ个自由度的非中心卡埃平方分布，起伏方差为声源特性和传播过程造成的起伏方差与处理器引起的方差之和；而海洋环境噪声采用平稳的白色高斯噪声模型时，通过窄带处理系统后的输出起伏满足２ＢＴ个自由度的卡埃平方分布，方差仅由处理器决定。最后给出相应的实验结果，与理论计算符合良好。
model s for the amplitude fluctuation of a line--component spectrum of ship radiated noise and ambient sea noise have discussed in this paper. When the signal model of line--component spectrum is taken to the sum of a sine--wave and narrow--band G&ussian white noise, the output fluctuation statistics for a narrow detector are found to follow a non--central chi--square distribution with ZBT degrees of freedom. The variance is equal to the sum of the variance caused by source characteristics and propagation processes and the processor's variance. On the other hand, the model of ambient sea noise is taken to a stationary white--Gaussian noise, the output fluctuation statistics are found to obey a chi--square distribution with 2BT degrees of freedom. Its variance' is determined only by the processor itself. The experiment data from the sea measurements is coincided with the theory computation.
出处
《声学学报》
EI
CSCD
北大核心
1996年第4期580-586,共7页
Acta Acustica
