基于改进LMS自适应算法的心电信号跟踪  

ECG Signal Tracking Based on Improved LMS Adaptive Algorithm

作　　者：张建峰 温惠康 徐铂裕 王红星 ZHANG Jianfeng;WEN Huikang;XU Boyu;WANG Hongxing(Meizhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Meizhou 514021,China)

机构地区：[1]广东电网有限责任公司梅州供电局,广东梅州514021

出　　处：《微型电脑应用》2024年第12期110-113,共4页Microcomputer Applications

基　　金：南方电网公司科技项目(031400KK52220005)。

摘　　要：杆塔高空作业施工环境复杂,风险较高。当前的风险评估策略主要基于理想的监测因素值,无法根据现场情况考虑作业人员自身及环境因素变化造成的影响,使得风险评估无法实时进行,不利于作业人员的人身安全。为了开展杆塔高空作业人员坠落的风险评估,考虑实时采集风险评估监测因素之一的心电数据,并提出一种基于自适应滤波的改进最小均方(LMS)自适应算法。考虑到传统LMS算法对于输入信号自相关矩阵较为敏感,因此在权值更新公式中添加3个动态权值项,使得改进算法的鲁棒性更高;采用变步长的方式,保证改进算法能够兼顾收敛速度和收敛精度;对BIT-MIH心电数据库的心电信号叠加正态分布噪声并进行信号跟踪,验证不同情况下的心电信号跟踪精度。研究结果表明,基于自适应滤波的改进LMS方法,能够较好地追踪心电信号,为更好地评估风险等级提供了精确的监测因素值,因而能更好地实时评估作业人员在杆塔上的作业风险。The environment is complicated and the risk is higher when people work on poles and towers in high-altitude.However,the current risk assessment strategy is mainly based on the ideal monitoring factor value,unable to consider the impact of the changes of operators and environmental factors according to the field situation,which makes the risk assessment can not be carried out in real time and is not conducive to the personal safety of operators.In order to realize the risk assessment of falling operations at high-altitude,an improved least-mean-square(LMS)adaptive algorithm based on adaptive filtering is proposed in this paper by considering the real-time acquisition of electrocardiogram(ECG)data,one of the monitoring factors of risk assessment.Because the traditional LMS algorithm is sensitive to the input signal autocorrelation matrix,three dynamic weights are added to the weight updating formula to make the improved algorithm more robust.The method of variable step size is adopted to ensure that the improved algorithm can give consideration to both convergence speed and convergence accuracy.The ECG signal of BIT-MIH ECG database is superimposed with normal distributed noise and the signal tracking is carried out to verify the ECG signal tracking accuracy under different conditions.The results show that the improved LMS method based on adaptive filtering can better track ECG signals and provide accurate monitoring factor values for better risk assessment.Therefore,it can better real-time assess the risk of operators working on the tower.

关 键 词：杆塔作业 LMS算法 心电信号 信号跟踪 

分 类 号：TN911.4[电子电信—通信与信息系统]