加速度基线漂移频域处理方法的对比研究

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Abstract

Aiming at the the baseline drift problem of velocity and displacement integrated from acceleration, this paper studied three kinds of frequency domain processing methods, namely low frequency cut-off algorithm, low frequency attenuation algorithm and the method based on filter , and analyzed the different theorems, parameters choice, correction effects, and the existing problems of different processing methods. At he same time, against the filter dispersion, this paper suggested two kinds of improved methods, owning the characteristics of clearly physical meaning and simple operation. The analysis of signal group delay showed the method was effective. Studies showed that the low frequency cut-off algorithm had the problem of frequency sensibility and energy leak problem caused by sudden truncation. The low frequency attenuation algorithm had the problem that different parameters combination could produce the same correction effect and the parameters lacked clear physical meaning. The method based on filter might be more complicated and cause signal dispersion, but by using the improved methods suggested by this paper could improve the signal dispersion well, and then through the reasonable parameters selection could eliminate the baseline drift problem of velocity and displacement.

Key words: baseline drift ; low frequency cut-off; low frequency attenuation; filter; phase delay; dispersion

Key words： baseline drift ')" href="#">

baseline drift low frequency cut-off low frequency attenuation filter phase delay dispersion

Received: 17 April 2015 Published: 25 June 2016

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