NDLI: Comparison of clutter rejection techniques for measurement of small displacements of body surface using radar

Content Provider	IET Digital Library
Author	Okumura, S. Sakamoto, T. Sato, T. Yoshioka, M. Inoue, K. Fukuda, T. Sakai, H.
Abstract	To measure vital signs using Doppler radar, a common approach involves the use of time-varying echo phase. To acquire these measurements, clutter rejection is necessary because clutter power is often larger than echo power. To reject static clutter, several techniques have been proposed that assume relatively large phase rotation angles because many studies assume the measurement of the upper torso, where displacement is mainly caused by respiration. However, signals from other parts of the human body are known to have smaller displacements that exhibit small phase rotation angles, which make clutter rejection more difficult. Three clutter rejection techniques for measuring small displacements are compared and their performances are investigated. Using numerical analysis, one method is demonstrated to be the most effective, even for small displacements in noisy data. The best method successfully estimates the centre with an error of −13.4 and −24.0 dB, with a signal-to-noise ratio of 10 and 40 dB and the range of phase rotation angles of 90° and 15°.
Starting Page	1635
Ending Page	1637
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 19, Sep (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/19
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2016.1461
Journal	Electronics Letters
Publisher	The Institution of Engineering and Technology
Publisher Date	2016-07-25
Access Restriction	Open
Rights License	Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	Body Surface Clutter Rejection Technique Displacement Measurement Doppler Radar Human Body Numerical Analysis Phase Rotation Angles Radar Clutter Radar Equipment Small Displacements Measurement Spatial Variables Measurement System And Application Time-varying Echo Phase Upper Torso Vital Signs
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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