Why the study?
A radar system was needed to mitigate unwanted narrowband interferences and increase signal-to-noise ratio for high-resolution vital-sign detection.
An impulse radio duty-cycled radar with an ultra-wideband VCO using frequency hopping successfully detected human breathing and heart rates, offering a potential non-contact vital-sign monitoring solution.
Feasibility of non-contact radar vital-sign detection shown in controlled settings; leaves open prospective clinical validation before adoption.
This paper presents a pulse-based radar with ultra-wideband voltage controlled oscillator for vital-sign application. A series of digital-assisted duty-cycled probing pulses with frequency hopping technique is proposed to mitigate unwanted narrowband interferences, thereby increasing overall system signal-to-noise ratio and then enabling high resolution detection. The RF generator is utilized by an on-chip VCO with the characteristic of wide-band response by digitally switching loaded capacitor array for frequency hopping. The conventional ultra-wideband channel is further divided into several sub-channels for vital-sign sensing. An impulse radio Doppler radar is implemented and integrated with the digital-assisted oscillator to detect physiological information.
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Chang et al. (2019) studied this question.
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