New Measurement Method for Respiration And Heartbeat Estimation Using IR-UWB Radar

In this work, the feasibility of using Delay And Sum (DAS) method in frequency domain and Variational Mode Decomposition algorithm (VMD) for respiration rate And heartbeat estimation using Impulse Radio Ultra-Wideband (IR-UWB) radar is demonstrated. The proposed method analyses the velocity of the chest displacement which is associated with breathing and heartbeat of human body. It based on solving two problems : velocity estimation and signal decomposition. The received matrix data is divided into a set of Coherent Processing Integration (CPI) times in slow time direction. To extract the vital signs signals, DAS method in frequency domain is adopted for IR-UWB radar to estimate the velocity of chest movement at each CPI. VMD algorithm is then applied to separate the Heartbeat signal from the respiratory signal. Experimental results proved the viability and the reliability of the proposed approach for long distances and in through the wall condition.