應用於生理活動偵測之相位及自注鎖定雷達設計

吳秉勳

doi:10.6342/NTU.2013.00009

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应用於生理活动侦测之相位及自注锁定雷达设计

Design of Phase- and Self-Injection-Locked Radar and Its Application in Detection of Physiological Motions

吴秉勳 , 博士　　导师：许博文　　

英文 DOI： 10.6342/NTU.2013.00009

雷达；生理活动；锁相；自注锁定；直流偏移； radar ； physiological motions ； phase-lock ； self-injection-lock ； dc offset

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摘要 │ 参考文献 (168) │ 国际计量

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The phase- and self-injection-locked radar is presented in this dissertation for robust detection of physiological motions with high sensitivity. The innovative method injects the Doppler phase-modulated echo signal back into a phase-locked oscillator and obtains the baseband signal by directly sampling the voltage-controlled oscillator tuning voltage controlled by the phase-locked loop without any demodulation circuits. Phase noise analysis indicates that the proposed radar has the advantages of both the phase-locked oscillators and self-injection-locked oscillators to achieve superior signal-to-noise ratio gain against the low-frequency phase noise in the bandwidth containing the physiological motion information. Consequently, the proposed radar can serve for long-range detections with less transmitted power.
In addition, this dissertation addresses the dc offset and the null point problems, which are two major challenging issues for conventional Doppler radar designs, in regard to reliable detection. The dc offset caused by clutter reflections and circuit imperfections is eliminated simply using a dual-tuning voltage-controlled oscillator without sophisticated clutter cancellation techniques. Analysis based on the classic injection locking equation shows that the dc offset can be removed without sensitivity degradation. Path-diversity transmission that switches between orthogonal self-injection-locked loops is employed to eliminate null points and reduce average transmitted power.
Several prototype circuits are designed to justify the theory and design equations. Experiments confirm successful detection of physiological motions from a distance of 4 meters with −22 dBm average transmitted power.

参考文献 ( 168 ) 〈TOP〉

[1] J. C. Lin, "Noninvasive microwave measurement of respiration," Proc. IEEE, vol. 63, p. 1530, Oct. 1975.
连结：
[2] K.-M. Chen, D. Misra, H. Wang, H.-R. Chuang, and E. Postow, "An X-band microwave life-detection system," IEEE Trans. Biomed. Eng., vol. 33, pp. 697–701, Jul. 1986.
连结：
[3] K.-M. Chen, Y. Huang, J. Zhang, and A. Norman, “Microwave life-detection system for searching human subjects under earthquake rubble or behind barrier,” IEEE Trans. Biomed. Eng., vol. 47, pp. 105–114, Jan. 2000.
连结：
[4] I. Arai, “Survivor search radar system for persons trapped under earthquake rubble,” in Proc. Asia-Pacific Microw. Conf. , vol. 2, Dec. 2001. pp. 663–668.
连结：
[5] C. Feige, O. Rogall, S. Fisun, and L. M. Reindl, “Detection technology for trapped and buried people,” in Proc. IEEE MTT-S Int. Microw. Workshop on Wireless Sensing, Local Positioning, and RFID, Sep. 2009.
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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。