基于噪声抑制门的两级自适应线谱增强算法

An Algorithm of Two-level Adaptive Line-spectrum Enhancement Based on Noise Suppression Gate

针对低信噪比下,自适应线谱增强(ALE)算法在低信噪比时性能急剧下降的问题,该文提出2级ALE算法,该算法在普通的ALE算法的基础上,将输出信号和误差信号的傅里叶变换作为第2级ALE的输入,对线谱作进一步增强。并利用噪声抑制门对信号进行降噪预处理,然后结合提出的2级ALE算法,提出一种基于噪声抑制门的2级ALE算法,进一步提高信噪比,增强线谱。仿真和海试数据表明,算法性能较普通ALE算法有较大提升。

In view of the problem that the performance of the Adaptive Line-spectrum Enhancement(ALE)algorithm drops sharply under low signal-to-noise ratio,a two-level ALE algorithm is proposed.Based on the ordinary ALE algorithm,the Fourier transform of the output signal and the error signal is used as the input of the second-level ALE to enhance further the line-spectrum.The noise suppression gate is used to perform noise suppression preprocessing on the signal,and then combining with the proposed two-level ALE algorithm,an algorithm of two-level ALE based on noise suppression gate is proposed to improve further the signal-to-noise ratio and enhance the line-spectrum.Simulation and sea trial data show that the performance of the algorithm is greatly improved compared with the ordinary ALE algorithm.