Title page for etd-0618117-132618


[Back to Results | New Search]

URN etd-0618117-132618
Author Sheng-chao Su
Author's Email Address No Public.
Statistics This thesis had been viewed 5559 times. Download 0 times.
Department Electrical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Two-Tone Self-Injection-Locked Radar for Life Detectors
Date of Defense 2017-07-11
Page Count 70
Keyword
  • self-injection-locked (SIL) radar
  • remote ranging
  • vital sign detection
  • Displacement monitoring
  • dual frequency radar
  • quadrature phase switching
  • Abstract This thesis is devoted to extend self-injection locked (SIL) radar in life detector and wearable device.This system can remotely monitor the 1-D vibration, displacement, and range information of a moving target.
    In life detector part, to achieve this goal, an additional phase shifter which provides 0°/90° phase delay is utilized in the quadrature self-injection-locked (QSIL) radar architecture. With the corresponding digital signal processing techniques, the moving target’s Doppler phase shift can be determined without the nonlinear distortion caused by the SIL phenomenon. Then the range information can be figured out by the phase difference of the two demodulated signals that one respectively measured with two different carrier frequencies. In experiments with a prototype operated at 2.4 GHz ISM band, a metal plate controlled by a precise actuator is utilized to verify the theoretical predictions.Moreover, for an individual seated 1.75m away from the radar, the prototype can successfully detect the vital sign and range information based on the subject's tiny chest movement. Accordingly, in the premise of saving spectrum resource, it is demonstrated that the system has promising ability to detect vibration, displacement, and distance with high dynamic range from tiny fluctuation such as vital signs to general case such as motion detection and vibrometering.
    In wearable device part,to achieve sensitivity, comfort, and durability in vital sign monitoring, this study explores the use of radar technologies in wearable devices. The study first detected the respiratory rates and heart rates of a subject at onemeter distance from the radars to compare the sensitivity versus power consumption between an SIL radar and a CW radar. Then, a pulse rate monitor was constructed based on a bistatic SIL radar architecture. This monitor uses an active antenna that is composed of a SIL oscillator (SILO) and a patch antenna. When attached to a band worn on the subject’s wrist, the active antenna can monitor the pulse on the subject’s wrist by frequency modulating the SILO with the Doppler phase shift. Subsequently, the SILO’s output signal is received and demodulated by a remote frequency discriminator to obtain the pulse rate information.
    Advisory Committee
  • Sheng-Fuh Chang - chair
  • Chao-Hsiung Tseng - co-chair
  • Fu-Kang Wang - co-chair
  • Huey-Ru Chuang - co-chair
  • Tzyy-Sheng Horng - advisor
  • Files
  • etd-0618117-132618.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2017-07-18

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys