High Ranging Accuracy and Wide Detection Range Interferometry Based on Frequency-Sweeping Technique with Vital Sign Sensing Function

Tsung Hsin Liu, Miao Lin Hsu, Zuo-Min Tsai *

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this paper, an interferometry-based frequency-sweeping technique has been developed and demonstrated. With this approach, the distance ambiguity problem in the traditional interferometer is solved. The relationship involving the used carrier number, noise and standing wave effects, the root-mean-square error, and the maximum unambiguous range are illustrated and discussed. The detection error caused by the noise and the standing wave effects is effectively reduced by properly increasing the used carrier number within the same bandwidth. The experiment indicates that the maximum detection error of a metal reflector detection is below 23 μm at a distance of 5 m. In addition, the vital sign sensing experiments are demonstrated. With this approach, the motion amplitude and frequency of the respiration and the heartbeats are constructed.

Original languageEnglish
Article number8418832
Pages (from-to)4242-4251
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume66
Issue number9
DOIs
StatePublished - 1 Sep 2018

Keywords

  • Distance measurement
  • frequency sweeping
  • interferometer
  • standing wave
  • vital sign detection

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