A Breathing And Heartbeat Monitoring Method Combining Ultra-wideband Radar With Multiple Classification Algorithms

The non-contact vital signs monitoring system based on UWB radar is to apply radar technology to the field of biological monitoring.Its purpose is to obtain the respiration and heart rate of target human body through non-contact method.In the context of the global spread of COVID-19,all parties in the hospital are seeking for more effective and safe monitoring methods.ultra-wideband radar based on non-contact vital signs monitoring system,which could protect the safety of life at the same time,also provide security for the front line medical personnel,meet the monitoring characteristics of the efficient and safe,it not only applied to medical monitoring of the epidemic prevention,can also be applied to patients with chronic disease or old man home breathing heartbeat health signs such as monitoring,set to become a popular means of surveillance.In this paper,the UWB radar monitoring system is mainly built,and the UWB radar module and UWB radar antenna are selected.According to their performance parameters,the appropriate UWB radar module and UWB radar antenna are selected,so as to establish the vital signs monitoring system of UWB radar.On this basis,the vital sign signal model was established according to the relationship between respiratory movement,heartbeat movement and chest undulation.The application of MUSIC algorithm in UWB radar vital sign monitoring system is proposed,and the feasibility of MUSIC algorithm is verified by simulation model.Signal processing is carried out on the radar echo to remove the influence factors such as noise and clutter in the radar echo,so as to provide a relatively pure signal containing vital sign information for the development of subsequent experiments.Then the experimental verification of UWB radar antenna and the experimental verification of vital signs extraction algorithm were carried out,and the vital signs monitoring experiments were carried out in normal environment and complex environment respectively.UWB radar antenna is mainly selected as omnidirectional UWB radar transceiver antenna,30 degree directional UWB radar transceiver antenna,and 90 degree directional UWB radar transceiver antenna.By setting six experimental distances of0.8m,1.0m,1.2m,1.4m,1.6m,1.8m,and 1.8m,the three antennas are tested at six distances respectively.The waveform of the target human body’s vital signs echo graph and the spectrum graph of respiration and heartbeat obtained by MUSIC algorithm and Fourier transform are obtained for comparison,and the appropriate UWB radar antenna is finally selected and the feasibility of MUSIC algorithm is verified.