Key result
A Doppler radar based on a phase locked self-injection oscillator successfully detected vital signs at distances up to 3 m.
A Doppler radar based on a phase-locked self-injection oscillator successfully detects vital signs up to 3 meters.
Hypothesis-generating for non-contact monitoring; requires prospective clinical validation before adoption.
A Doppler radar based on a phase locked self-injection oscillator is presented for vital-sign detection. The phase-locked loop (PLL) stabilizes the output frequency and serves as the demodulator. The architecture has a well defined operating frequency compared to a free-running self-injection oscillator. A frequency domain model is developed to calculate the circuit parameters for desired sensitivity requirements. Experiments demonstrate successful detections of the vital signs up to 3 m.
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Wu et al. (2012) studied Vital-sign detection. Doppler radar based on a phase locked self-injection oscillator vs. Free-running self-injection oscillator was evaluated on Vital-sign detection distance. A Doppler radar based on a phase locked self-injection oscillator successfully detected vital signs at distances up to 3 m.
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