基于四阶累积量切片谱的谐波信号线谱提取

Line spectrum extraction of harmonic signals by using fourth-order cumulant slice spectrum

提出一种新的谐波信号线谱提取方法,通过对四阶累积量对角切片或非对角切片作傅立叶变换,得到四阶累积量切片谱,运用切片谱提取谐波信号的线谱特征。相比于传统的基于高阶谱估计的线谱提取方法,该方法既继承了其消除高斯噪声的优点,又简化了计算量、提高了估计质量,并且不再要求信号满足二次或三次相位耦合。仿真实验证明了该方法的有效性和优越性。

This paper presents a novel line spectrum extraction method for harmonic signals.By using the Fourier transform of fourth-order diagonal or non-diagonal cumulant slices,which is defined as fourth-order cumulant slice spectrum,the line spectrum feature was extracted effectually.Compared with the traditional higher-order spectrum approaches,the new method not only keeps the advantage of eliminating Gaussian noise,but also owns a less computing amount and a better estimation quality.And what is more important is that the new method no longer requires the signals to be quadratic or cubic phase coupled.The simulation results show that the method is good and effective.