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Phase- and Self-Injection-Locked Radar for Detecting Vital Signs with Efficient Elimination of DC Offsets and Null Points

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5 Author(s)
Ping-Hsun Wu ; Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan ; Je-Kuan Jau ; Chien-Jung Li ; Tzyy-Sheng Horng
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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.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:61 ,  Issue: 1 )