Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 65, Issue 2, Pages 621-631Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2016.2625796
Keywords
Calibration; displacement measurement; error propagation; quadrature Doppler radar; radius correction (RC)
Categories
Funding
- National Science Foundation [ECCS-0926076]
- University of Hawaii Renewable Energy and Island Sustainability Program
- Department of Energy [DEOE0000394]
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Noncontact physiological monitoring using Doppler radar has been studied extensively. Most commonly, continuous-wave (CW) quadrature Doppler radar is used to measure cardiopulmonary rates. Accurate displacement measurement can provide physiological waveform recovery, which may enable tidal volume and pulse pressure estimation. In this paper, we propose a calibration technique that enables high-accuracy millimeter-order periodic displacement measurements using CW quadrature Doppler radar. Theoretical analysis of center estimation error and its propagation effect are presented. Simulations are performed to show how noise and limited arc length affect error and affect the accuracy of center estimation, as well as improvements after calibration. A high-precision linear stage was employed to create periodic motion for evaluating the performance of calibration technique. Experimental results demonstrate that the proposed calibration technique enables displacement measurement with accuracy within tens of micrometers.
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