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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。
Commonly used traditional and modern methods have certain shortcomings for the frequency estimation of sinusoidal signals in noisy environments. In this paper, an adaptive notch filter is constructed by using cascade of second-order wave traps to estimate the frequency of multiple signals. The parameters of each second-order notch filter are simultaneously optimized by recursive error signal and recursive least square method. The simulation results show that this method has good estimation results for single frequency, multi-frequency and frequency changes, and has robustness to noise interference.