Abstract
The conventional frequency modulated continuous wave (FMCW) radar accuracy range detection algorithm is based on the frequency estimation and additional phase evaluation which contains Fourier transform and frequency refining analysis in each chirp, so it has the disadvantages of being computationally expensive, and not being suitable for real-time motion measurement. In addition, if there are other objects near the target, the spectra of the clutter and the target will be adjacent and affect each other, making it more challenging to estimate the frequency of the target. In this paper, the analytical expression of the Fourier transform of the beat signal is presented and it can be seen that spectrum leakage makes the phase of Fourier transform no longer consistent with the real phase of signal. The change regularities of real and imaginary parts of Fourier transform are studied, and the corrected phase of ellipse approximation is given in the industrial, scientific, and medical (ISM) band. Accurate displacement can be obtained by accurate phase. The algorithm can filter the direct current (DC) offset which is mainly caused by stationary objects. The performance of the algorithm is evaluated by a radar system whose center frequency is 24.075 GHz and the bandwidth is 0.15 GHz; the measurement accuracy of displacement is 0.087 mm and the accuracy of distance is 0.043 m.
Highlights
Motion detection technology can be applied to industry, security, traffic, and health monitoring
Frequency modulated continuous wave (FMCW) radar is commonly used in motion measurement
Through the analytical expression of the Fourier transform of the beat signal at a specific frequency, we found that the real and imaginary components of the Fourier transform are superimposed in vertical direction with an elliptical trajectory in ISM band
Summary
Motion detection technology can be applied to industry, security, traffic, and health monitoring. Traditional measurement methods including optical [1], ultrasonic [2], and laser [3] are vulnerable to the environment. The measurement accuracy is sensitive to temperature. In the environment of rain, snow, dust, and fog, optical and laser sensors may be unable to work normally, while microwave radar offers a robust way in the above-mentioned environments. Frequency modulated continuous wave (FMCW) radar is commonly used in motion measurement. Compared with continuous wave (CW) radar [4], it has the advantages of ranging and multi-target detection [5]. Compared with pulse radar [6], it has no blind distance, and the peak power of transmitted wave required for the same detection range is lower
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
