迭代ICA与LEVKOV联合的瞬态响应工频干扰抑制方法

针对传感器瞬态响应中的工频干扰因频率游动、谐波及频带混叠导致难以去除的问题,提出了迭代独立分量分析 (ICA)与 LEVKOV 联合抗工频干扰的方法。 将迭代 ICA 法与 LEVKOV 法相结合,通过构造工频参考信号,采用迭代 ICA 的方 法以减小瞬态响应中频率游动的工频干扰,再利用 LEVKOV 法通过线性段均值滤波和非线性段噪声模板滤波来进一步削弱工 频干扰及其谐波干扰,从而提高瞬态响应信号中工频干扰的滤除精度。 仿真和实验数据验证结果表明,所提出的迭代 ICA 与 LEVKOV 联合抗工频干扰法相较于独立的迭代 ICA 法和 LEVKOV 法而言,对传感器瞬态响应中的工频干扰具有更好的抑制 效果。

Anti-power interference method of combining iterative ICA and LEVKOV for transient response

Aiming at the problem that the power interference in the sensor transient response is difficult to remove due to frequency swinging, harmonic and frequency aliasing, a joint anti-power interference method of iterative ICA and LEVKOV is proposed. For the proposed method, the iterative ICA method is combined with LEVKOV method; iterative ICA method is first used to reduce the power interference with frequency swinging based on constructing reference signal of power interference, and then LEVKOV method is used to further remove the weakened power interference and its harmonic interferences by the means of mean filtering for linear segment and noise template filtering for nonlinear segment, so as to improve the filtering accuracy of the power interference mixed in the sensor transient response. The simulation and experimental data verification results show that, compared with the separated iterative ICA method and LEVKOV method, the proposed anti-power interference method of combining iterative ICA and LEVKOV has a better suppression effect on the power interference in the sensor transient response.