【摘要】 提出了一种基于三阶累积量对角切片的特征检测方法。该方法既不需待检信号做高斯和平稳的假设,也不需要有信号的先验知识。其原理是首先通过滤波器组将检测信号在频域上进行分离,选取输出能量较大的一组子频带信号近似给出信号的时频描述;然后在各个选中的子频带内分别计算三阶累积量的短时估计,从而抑制有色噪声,将信号的特征检测出来。仿真信号验证了该方法的有效性和适应性。更多还原

【Abstract】 A method for detecting feature of signal embedded in additive noise is presented,which based on third-order cumulant diagonal slice.Neither the supposition of the observed signal is Gaussian or stationary,nor a prior information about the waveform and arrive time of the observed signal is necessary.The primary principle of the proposed method is to separate the spectrum of the observed signal into narrow frequency band by using a bandpass filter banks,those subfilters which have large output energies are chosen to give a time-frequency description of the observed signal approximately,each chosen subfilter is then followed by a short-time estimation of third-order cumulant so that to suppress colored noise and detect the signal feature.Simulated result shows that the method is effective and practical.更多还原