Research Of ECG Signal Acquisition And Analysis Based On Fatigue-driving

In recent years, fatigue-driving has become the significant factor in traffic accident. Among the reasons for that, most people are not aware of the dangers caused by fatigue-driving, also there is no effective way for detecting the fatigue state in real-time. Imaging that if a parameter could be detected in real-time as a indicator of fatigue state, then a lot of traffic accidents would be avoided. In this paper, of all the parameters applying in fatigue detection, the ECG signal was selected as check signature. ECG signal acquisition and analysis method is studied systematically.In acquisition part, apparently, traditional way to gather ECG signal is impossible to be taken. A new portable device that can do the same thing but does not require any conductive paste and electrode to the driver is developed. The device contained conductive fabrics that attach to steering wheel as a signal conductor. EKG-BTA sensor would amplify ECG to recognized level. USB6008as an A/D converter can load ECG signal into computer for analysis. After accomplishing the basis function, non-contact measurement for ECG has been probed.In analysis part, firstly, ECG signal has been pre-processed. Studying the effect of the band-reject filter and smooth filtering at four points on50Hz frequency suppression was done. Based on wavelet theory, wavelet decomposition to remove baseline drift achieved good effect. Also, the commonly used high-pass filter has been compared with wavelet decomposition filter. Finally, using the quadratic minimum and the signal amplitude to determine R wave location has obtained the good result.In conclusion, the system can finish monitoring ECG signal in real-time, also performing good at alarm when heart rate is the indicator of fatigue state.