摘要
将子波变换和高阶累积量联合分析应用于对水下目标辐射噪声的特征提取。首先利用子波变换提取辐射噪声的动态调制分量，然后应用四阶累量对角切片的傅立叶变换（21/2维谱）分析该动态调制的谐波特性。结果表明，该方法可以有效地实现动态调制分量与其他信号的分离，准确提取谐波特征。由于四阶累量对高斯噪声的抑制性，该方法还具有很强的抗噪性。此外，相对与双谱和三谱分析，21/2维谱分析极大减少了计算量，降低了方法的复杂程度，具有较快的运算速度。
The joint analysis of wavelets and higher-order cumulants is first used to analyze underwater target radiated noise in the paper. First, we use wavelet transform to extract the dynamic modulation of radiated noise, then a FFT transform of fourth-order cumulants' diagonal slices is used to analyze harmonic features of this process. The results show that the method can effectively separate the dynamic modulation from other parts of radiated noise, and extract harmonic features. Because fourth-order statistics can restrain the gaussian noise, the method has high stability in noise conditions. Moreover, comparing with bispectrum and trispectrum, 21/2-spectrum analysis evidently decreases calculational amount, costs little computer time and can be easily performed.
出处
《系统仿真学报》
EI
CAS
CSCD
2001年第2期175-177,共3页
Journal of System Simulation
关键词
子波变换
动态调制
高阶累积量
水下目标辐射噪声
水声
wavelet transform
fourth-order statistics
21/2-dimensional spectrum
dynamic modulation.
