A novel phase- and self-injection-locked radar system successfully detects vital signs from 4 meters with very low transmitted power.
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Low-power radar supports non-contact vital sign feasibility; leaves open clinical validation before cardiovascular adoption.
A phase- and self-injection-locked radar is presented for robust vital-sign detection. The dc offset from the clutter is eliminated by using a dual-tuning voltage-controlled oscillator without complex clutter cancellation techniques. Phase noise analysis shows that the proposed radar has the advantages of both phase-locked oscillators and self-injection-locked oscillators to achieve high power spectral signal-to-noise ratio. Path-diversity transmission is employed to eliminate null points and reduce average transmitted power. Experiments demonstrate successful detection of breathing and heartbeat from a distance of 4 m with -22 dBm (6 μW ) average transmitted power.
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Wu et al. (2013) studied this question.
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