基于级联自适应陷波器的正弦波频率估计

常用的传统和现代方法对于噪声环境中正弦信号的频率估计均存在一定的缺陷。本文利用二阶陷波器级联构造自适应陷波器,实现对多个信号频率的估计;采用递推误差信号和递推最小二乘法同时优化各个二阶陷波器的参数。仿真结果表明,该方法对于单频、多频和频率变化等情况均具有较好的估计结果,且对于噪声干扰具有较强的鲁棒性。

A Method of Sinusoidal Frequency Estimation Based on Cascaded Adaptive Notch Filters

Traditional and modern algorithms like PSD, ESPRIT and MUSIC have some deficiencies while estimating frequencies of sinusoidal signal in noisy circumstance. The adaptive frequency estimator constructed with the cascade second - order notch filters is presented to realize the estimation of multiple frequencies. Parameters of each second-order notch filter are optimized concurrently with RLS algorithm and recursive error signal. Simulation shows the algorithm has good results in case of estimating single frequency, multiple frequencies and changing frequency under different SNR, and has robustness for noise inference.