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Application of Linearfrequencymodulated Continuouswave Lfmcw Radars for Tracking of Vital Signs

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Abstract

In this paper, the discussion is on non-contact vital signs monitoring using a frequency-modulated continuous-wave (FMCW) radar. Here, we analyze the phase of the intermediate frequency (IF) signal in detail. Any human or clutters exposed to the FMCW radar signal can reflect the chirp. The reflected chirp goes to the mixer to produce an IF signal. This paper deals with extracting vital signs such as breathing rate and heart rate from a subject who sits in front of the radar irrespective of the chest orientation toward the radar. The phase of the IF signal is processed to obtain the spectrum in the desired range-bin. The spectrum is further subjected to filtering and thresholding as will be detailed. Random body movements are detected, and those samples are discarded for the calculation of heart rate.

Keywords

  • Vital signs
  • Breathe rate
  • Heart rate
  • FFT
  • Phase
  • Unwrapping
  • Chirp

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Author information

Authors and Affiliations

  1. Department of Electrical Engineering, IISc, Bengaluru, India

    G. N. Rathna & Deepchand Meshineni

Corresponding author

Correspondence to G. N. Rathna .

Editor information

Editors and Affiliations

  1. Department of Electronics and Communication Engineering, Manipal University Jaipur, Jaipur, Rajasthan, India

    Dr. Sanyog Rawat

  2. Department of Electronics and Communication Engineering, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India

    Dr. Arvind Kumar

  3. Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

    Dr. Pramod Kumar

  4. Telecommunication Engineering, Ramon Llull University, Barcelona, Spain

    Dr. Jaume Anguera

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Rathna, G.N., Meshineni, D. (2022). Vital Signs Monitoring Using FMCW Radar for Different Body Orientations in the Presence of Random Body Movement. In: Rawat, S., Kumar, A., Kumar, P., Anguera, J. (eds) Proceedings of First International Conference on Computational Electronics for Wireless Communications. Lecture Notes in Networks and Systems, vol 329. Springer, Singapore. https://doi.org/10.1007/978-981-16-6246-1_42

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  • DOI : https://doi.org/10.1007/978-981-16-6246-1_42

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