Key result
A fully customized embedded radar system driven from a 60 Hz ac source was developed for real-time physiological detection of vital signs without requiring a conventional quartz crystal unit.
The development of a crystal-less radar system utilizing power-line interference for clock generation demonstrates a novel approach for embedded cardiorespiratory monitoring.
May enable compact cardiorespiratory monitoring; leaves open prospective clinical validation before practice adoption.
A duty-cycled and pulse-based embedded radar system without a quartz crystal unit is presented for cardiorespiratory monitoring. A reference clock source with features of high accuracy and temperature independence is directly gained from ac electric power grids. The 50/60 Hz power-line interference is further utilized and converted to a reliable clock source as a substitute for the conventional crystal that can be fed into the radar system. The theoretical analysis of the clock source conversion circuit and the experimental instantaneous frequency deviation from the wall outlet will be described to investigate frequency stability and uncertainty based on statistical evidence and significance. In addition, a pulse control unit (PCU) with a duty-cycle mechanism is implemented to convert the initial clock into a duplet-pulse sequence with a tunable phase delay for simultaneously performing the probing and demodulated pulses. A fully customized embedded radar system driven from a 60 Hz ac source is proposed for real-time physiological detection.
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Chang et al. (2022) studied cardiorespiratory monitoring. Crystal-less embedded cardiorespiratory radar system was evaluated. A fully customized embedded radar system driven from a 60 Hz ac source was developed for real-time physiological detection of vital signs without requiring a conventional quartz crystal unit.
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