Key result
A 2.5-GHz experimental prototype of a vital signal radar with adaptive dc compensation circuits successfully detected heartbeat and respiration signals.
A novel 2.5-GHz vital signal radar with adaptive dc compensation circuits can automatically eliminate dc offsets and successfully detect heartbeat and respiration signals.
May support non-contact vital sign monitoring; leaves open clinical validation before practice adoption.
A new type of vital signal radar with adaptive dc compensation circuits that can automatically eliminate the dc offsets caused by clutter signals without software controlled units is presented. The theoretical analysis of the dc compensation circuits, which are connected to the outputs of a direct conversion mixer will be described. A 2.5-GHz experimental prototype was fabricated on a printed circuit board substrate to verify the proposed adaptively compensated radar. All circuits are realized by commercially available devices. Measurements show very good agreement with theoretical prediction. The radar can be used with only a single antenna connected to the proposed module and have successfully detected clearly heartbeat and respiration signals at any distance within the detectable range by incorporating phase-shifting technique.
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Yang et al. (2017) studied this question. Vital signal radar with adaptive dc compensation circuits was evaluated on Detection of heartbeat and respiration signals. A 2.5-GHz experimental prototype of a vital signal radar with adaptive dc compensation circuits successfully detected heartbeat and respiration signals.
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