Non-contact Vital Sign Detection via MSO-VMD

The radio frequency-based non-contact monitoring method provides a feasible direction for reducing the burden on users and achieving stable health monitoring. Since the chest micro-movement caused by heartbeat and breathing is usually at the millimeter level, this paper uses 77Ghz FMCW millimeter-wave radar to implement vital sign monitoring. Variational mode decomposition (VMD) is used to decompose the breathing, heartbeat information and environmental clutter of the human echo signal. However, the selection of modal decomposition-related parameters will affect the effect of signal decomposition. To this end, this paper proposes a VMD algorithm based on MSO optimization. Simulation experiments illustrate the noise robustness and applicability of MSO-VMD in complex scenarios. In addition, the human echo pulse is obtained and processed in a real environment, and the accuracy of the algorithm is verified by the results of the contact device.