几种自适应IIR陷波器的复数算法及其应用

Complex adaptive IIR notch filter algorithms and their applications

在自适应IIR陷波器实数算法的基础上,本文提出了三种基于梯度的自适应IIR陷波器的复数算法,并进行了仿真比较。结果表明,这三种复数算法均可检测复信号,并估计信号频率,其中"改进的"简化格型IIR陷波器复数算法收敛速度快、低信噪比下稳定性能好。湖上试验表明该算法不仅实时性好,而且在低信噪比下的检测效果令人满意。

The problem of detecting the complex narrowband signal using complex adaptive IIR notch filter is investigated. In this paper, three complex coefficient adaptive IIR notch filters using gradient-based algorithms are proposed. These three methods are compared among themselves in terms of detecting performance and estimation accuracy. Simulation results show that these proposed algorithms can all detect and estimate the frequency of sinusoid, but an ＂improved＂ simplified lattice complex algorithm outperforms the other two in the convergence speed, tracking speed and steady-state mean square error at low SNR. Lake trial results confirm the real-time detecting ability of our proposed ＂improved＂ algorithm.