Title page for etd-0131113-161509


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URN etd-0131113-161509
Author Fu-Kang Wang
Author's Email Address d983010020@student.nsysu.edu.tw
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Department Electrical Engineering
Year 2012
Semester 1
Degree Ph.D.
Type of Document
Language English
Title A Self-Injection-Locked Radar for Non-Contact Vital Sign Detection and See-Through-Wall Imaging
Date of Defense 2013-01-11
Page Count 104
Keyword
  • see-through-wall (STW) imaging
  • sum-difference pattern
  • random body movement
  • clutter
  • vital signs
  • continuous-wave (CW) radar
  • oscillator
  • self-injection-locked radar
  • Abstract When promoting advanced radar technologies for civilian applications, conventional architectures have encountered serious challenges such as cost, system complexity, and power consumption. Therefore, to potentially overcome these disadvantages, this dissertation proposes a novel continuous-wave (CW) radar architecture using a self-injection locked (SIL) oscillator. The theoretical analysis in this dissertation provides a delta-sigma model to account for the excellent signal-to-noise spectral density ratio (SNR) measured in the reception signal of the proposed SIL radar. Accordingly, two-antenna and single-antenna SIL radars with high sensitivity are respectively developed for non-contact cardiopulmonary monitoring. The SNR gain can be quadrupled by doubling the operating frequency, and clutters hardly affect the optimal SNR performance in the SIL radar. Furthermore, using the swept frequency method, the SIL radar can eliminate null detection points and co-frequency interference. Subsequently, two SIL radars are used to detect vital signs with the cancellation of random body movements. In one of the experiments, a subject is placed between two single-antenna SIL radars to measure the subject’s respiration rate and heartbeats using the principle of the Doppler shift, and the effects of random movements of the subject are cancelled by wireless mutual-injection locking (MIL) of the two SIL radars. This dissertation finally presents a see-through-wall (STW) imaging system with distance measuring and tracking capabilities to discover people who are hiding behind a wall. Based on the SIL radar, the proposed STW system integrates the two approaches of frequency-modulated continuous wave (FMCW) and of sum-difference pattern detection to determine the range and the azimuth from the radar to the subjects who are separately positioned behind a wooden partition wall. By using dynamic spectral subtraction to extract human vital signs and decomposing the Doppler signal into contributions of subjects in a polar domain, two or more concealed subjects can be distinguished from each other. The experimental results correspond closely with the theoretical predictions, verifying the significant, reliable, and practical characteristics of the self-injection-locked radar.
    Advisory Committee
  • Kin-Lu Wong - chair
  • Sheng-Fuh Chang - co-chair
  • Kang-Chun Peng - co-chair
  • Ken-Huang Lin - co-chair
  • Tah-Hsiung Chu - co-chair
  • Huey-Ru Chuang - co-chair
  • Shyh-Jong Chung - co-chair
  • Tian-Wei Huang - co-chair
  • Tzyy-Sheng Horng - advisor
  • Files
  • etd-0131113-161509.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-01-31

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