A single radar-based vital sign monitoring system with resistance to large body motion

This paper presents a self-injection-locked (SIL) radar system to transmit and retransmit (T&RT) a continuous wave to the opposite sides of a human body to detect vital signs with large body movement cancellation. The system can reduce the nonlinear effects caused by body movement on the vital sign signals in the process of cancelling the body motion artifacts. Moreover, a tunable phase shifter is used to improve the limitation of this system due to the environmental clutter. In the experiments, over 95% of the body motion artifacts are removed in real-time monitoring of the vital sign signals when the body moves over a range of more than a wavelength.

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