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학술지 Quadrature Frequency-Group Radar and Its Center Estimation Algorithms for Small Vibrational Displacement
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김동규, 김유진
Scientific Reports, v.9, pp.1-17
Nature Research
18ZH1600, 착용불편 해소를 위한 비접촉 착용 레이더의 Motion Artifact 제거 기술, 김동규
The quadrature continuous-wave (QCW) radar has been extensively studied for small vibrational displacement detection such as non-contact sensing of human vital signals. One of the challenges of the QCW radar is the IQ-imbalance and DC-offset estimation by using curve fitting algorithms. Many algorithms have been proposed and have shown that the fitting error increases when the displacement length is small, in which case sufficient data is not provided to the algorithms. This paper presents a quadrature frequency-group (QFG) radar which utilizes a group of frequencies to enhance the fitting performance even with the small displacement. The grouped-frequencies in the QFG radar gives more data than the single-tone of the QCW radar under the same displacement condition. This paper presents the framework and properties of the QFG radar. Some fitting algorithms for the QFG radar are presented and the most adequate algorithm is suggested by simulation and experiments. Simulation and experimental results shows that the QFG radar outperforms the QCW radar. Specifically, it is shown that the fitting accuracy of the QFG radar is up to 100 times better than the QCW radar in the experiment.
KSP 제안 키워드
Curve Fitting, DC-offset, Fitting accuracy, IQ imbalance, Non-contact sensing, Small displacement, Vibrational displacement, Vital signals, continuous wave(CW), displacement detection, estimation algorithm
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