Vital signs monitoring of multiple people using a FMCW millimeter-wave sensor

Ahmad, Adeel; Roh, June Chul; Wang, Dan; Dubey, Aish

doi:10.1109/radar.2018.8378778

Cited by 236 publications

(141 citation statements)

References 13 publications

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“…This study focused on situations with multiple subjects in the same direction, which is a much more challenging than when the subjects are positioned in different directions. The beam steering method can provide azimuth angle resolution for multiple subjects [22], [30]. Thus, the proposed method can be combined with the beam steering method to provide high-resolution two-dimensional position detection and vital sign measurement for multiple subjects.…”

Section: Discussionmentioning

confidence: 99%

A Resolution Enhancement Technique for Remote Monitoring of the Vital Signs of Multiple Subjects Using a 24 Ghz Bandwidth-Limited FMCW Radar

et al. 2020

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This study proposes a novel signal processing method for detecting the vital signs of multiple adjacent subjects using a 24 GHz frequency modulated continuous wave Doppler radar. Radar-based vital signs sensors have attracted significant attention because of their contactless and unobtrusive mode of measurement. However, limited-bandwidth, fixed-beam systems have been restricted to single subjects because a high resolution is required to detect the vital signs of multiple adjacent subjects. As the range resolution is determined by the frequency bandwidth, a novel method is proposed that doubles the effective frequency bandwidth by using a modified waveform. The proposed method can distinguish between two subjects sitting 40 cm apart, overcoming the 60 cm Rayleigh resolution for a frequency bandwidth of 250 MHz. The computational complexity of the proposed method is considerably low when compared with high-resolution algorithms such as the multiple signal classification algorithm. Furthermore, the method easily suppresses stationary clutter by using phase deviation. To validate the performance of the proposed method, experiments were conducted with two subjects lying side by side on a bed. The results indicate the excellent performance, with enhanced range and high detection accuracy. This method has many potential applications, including monitoring infants and sleep apnea patients.

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Section: Discussionmentioning

confidence: 99%

A Resolution Enhancement Technique for Remote Monitoring of the Vital Signs of Multiple Subjects Using a 24 Ghz Bandwidth-Limited FMCW Radar

et al. 2020

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“…The results from the experiments show accuracies of 80% and 94% for HR and BR, respectively. Lastly, the authors in [141], uses multiple antennas to detect and locate the vital signs of two SUTs. The block diagram of the signal-processing employed in that work is given in Figure 13c.…”

Section: Algorithms and Signal Processingmentioning

confidence: 99%

“…To remove the user-induced motion artifact, a certain signal energy threshold value where any time window signal energy exceeding that value is omitted from the data. [140] and (c) [141] to retrieve the range and vital signs of subjects-under-test (SUTs).…”

Section: Algorithms and Signal Processingmentioning

confidence: 99%

“…Showing relatively low power consumption, this system may be used for long-term monitoring of patients. In [141], An FMCW radar was able to detect a vibrating reflector and a human subject located at the same range bin, with the help of beamforming.…”

Section: Biomedical Practicementioning

confidence: 99%

“…Algorithms used in (a)[138], (b)[140] and (c)[141] to retrieve the range and vital signs of subjects-under-test (SUTs).…”

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confidence: 99%

See 2 more Smart Citations

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Kebe

Gadhafi

Mohammad

et al. 2020

Sensors

135

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Continuous monitoring of vital signs, such as respiration and heartbeat, plays a crucial role in early detection and even prediction of conditions that may affect the wellbeing of the patient. Sensing vital signs can be categorized into: contact-based techniques and contactless based techniques. Conventional clinical methods of detecting these vital signs require the use of contact sensors, which may not be practical for long duration monitoring and less convenient for repeatable measurements. On the other hand, wireless vital signs detection using radars has the distinct advantage of not requiring the attachment of electrodes to the subject’s body and hence not constraining the movement of the person and eliminating the possibility of skin irritation. In addition, it removes the need for wires and limitation of access to patients, especially for children and the elderly. This paper presents a thorough review on the traditional methods of monitoring cardio-pulmonary rates as well as the potential of replacing these systems with radar-based techniques. The paper also highlights the challenges that radar-based vital signs monitoring methods need to overcome to gain acceptance in the healthcare field. A proof-of-concept of a radar-based vital sign detection system is presented together with promising measurement results.

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Radar-Based Non-Contact Physiological Sensing

Islam

2021

Vision, Sensing and Analytics: Integrative Approaches

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Vital signs monitoring of multiple people using a FMCW millimeter-wave sensor

Cited by 236 publications

References 13 publications

A Resolution Enhancement Technique for Remote Monitoring of the Vital Signs of Multiple Subjects Using a 24 Ghz Bandwidth-Limited FMCW Radar

A Resolution Enhancement Technique for Remote Monitoring of the Vital Signs of Multiple Subjects Using a 24 Ghz Bandwidth-Limited FMCW Radar

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Radar-Based Non-Contact Physiological Sensing

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