摘要
从数学上证明了长序列FFT分析可实现噪声抑制,从而提高信噪比,其实质相当于时间积累。利用变步长的自适应线谱增强器进行线谱增强,可以提高信噪比。用两种方法分析了实际舰船信号的调制谱,讨论了合理选取参数的方法。实验证明,合理运用这两种方法,可以达到较好的分析效果。
It is proved that long sequence FFT analysis can suppress noise therefore improve SNR, which is equivalent to time accumulation. A variable step-size algorithm is used in adaptive line spectrum enhancement (ALE) to enhance the line spectrum so that SNR is enhanced. Both methods are used to analyze ship-radiated noise. The results show that that method is effective in extracting spectrum lines.
出处
《声学技术》
EI
CSCD
北大核心
2005年第2期101-104,共4页
Technical Acoustics
关键词
FFT
自适应线谱增强
舰船辐射噪声
调制谱
Algorithms
Fast Fourier transforms
Radiation effects
Signal to noise ratio
Spectrum analysis
Spurious signal noise
