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Journal Article Quadrature Frequency-Group Radar and Its Center Estimation Algorithms for Small Vibrational Displacement
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Authors
Dong Kyoo Kim, Youjin Kim
Issue Date
2019-05
Citation
Scientific Reports, v.9, pp.1-17
ISSN
2045-2322
Publisher
Nature Research
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1038/s41598-019-43205-7
Abstract
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 Keywords
Curve Fitting, DC-offset, Fitting accuracy, IQ imbalance, Offset estimation, Small displacement, Vibrational displacement, Vital signals, continuous wave(CW), displacement detection, estimation algorithm
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
CC BY