受运动伪影干扰PPG序列的优质信号提取算法  

Algorithm for extracting high quality signals from PPG sequence with motion artifact

作　　者：孙斌 王成超 陈建飞 张永芳 陈小惠[1] Sun Bin;Wang Chengchao;Chen Jianfei;Zhang Yongfang;Chen Xiaohui(School of Automation,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;School of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学自动化学院,南京210023 [2]南京邮电大学电子与光学工程学院,南京210023

出　　处：《仪器仪表学报》2018年第9期171-178,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学青年基金(61801239,61601237);江苏省高校自然科学研究面上项目(16KJB420001);南京邮电大学人才引进基金(NY215051);南京邮电大学基金(NY217067,NY215086,NY214057)项目资助

摘　　要：为了解决可穿戴设备中,由于运动伪影干扰带来的光电容积脉搏波（PPG）信号不稳定,导致生理参数计算错误的问题,提出了一种可以在PPG序列中提取优质、无干扰信号的算法,该算法具有计算量小、抗干扰能力强的优点。首先对采集到的PPG序列进行带通滤波和降噪;之后采用峰度、偏度指标判断是否有运动伪影存在;然后采用滑窗算法对滤波后的PPG信号进行特征提取,寻找主波波峰、重搏波波峰;最后,采用方差判别法对特征值进行进一步筛选,用于提取连续的无干扰PPG信号。设计了波长为905和660 nm的反射式生理参数计算系统,在系统中实现了该算法,使用采集到的受干扰PPG信号进行血氧饱和度和血压计算实验,证明了本算法可以有效提取PPG序列中的优质信号,提高了生理参数的计算精度。In order to solve the problem that the photoplethysmographic（PPG） signal in wearable device is unstable due to the motion artifact interference, which leads to wrong calculation of the physiological parameters, an algorithm for extracting high quality and non-interference signals in PPG sequence is proposed, which has the advantages of small computation and strong anti-jamming ability. Firstly, the band-pass filtering and noise reduction are carried out for the collected PPG sequences. Secondly, the kurtosis and skewness indexes are used to judge whether there is a motion artifact in the PPG sequence. Thirdly, the sliding window algorithm is used to extract the characteristic of the filtered PPG signal and find the systolic wave and dicrotic wave. Finally, the variance discriminant method is used to further sift the eigenvalues, which can be used to extract continuous non-interference PPG signals. A physiological parameter calculation system that has the reflective sensors with wavelength of 905 nm and 660 nm was designed, in which the algorithm is implemented. Blood oxygen saturation and blood pressure calculation experiments were conducted using the collected disturbed PPG signals, which proves that the algorithm can effectively extract high-quality signals from the PPG sequences and improve the calculation accuracy of physiological parameters.

关 键 词：光电容积脉搏波 运动伪影 光电检测 特征提取 生理参数计算 

分 类 号：TH789[机械工程—仪器科学与技术] R318[机械工程—精密仪器及机械]