High-Accuracy Real-Time Monitoring of Heart Rate Variability Using 24 GHz Continuous-Wave Doppler Radar

Petrović, Vladimir L.; Janković, Milica M.; Lupsic, Anita V.; Mihajlović, Veljko R.; Popovic-Bozovic, Jelena

doi:10.1109/access.2019.2921240

Cited by 125 publications

(85 citation statements)

References 54 publications

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“…Heart rate variability (HRV) provides the time variation in beat-to-beat interval and is particularly important for correlating the cardiovascular regulatory system response to stress, illness and demands [167]. In addition to stress and emotion recognition, HRV assessment can be important for anxiety treatment and vigilance monitoring [168]. Doppler radars have the capability of detecting beat-to-beat signal of human cardiac activities with acceptable accuracy.…”

Section: Heart Rate Variability Assessment Using Vital Signs Radarmentioning

confidence: 99%

“…The results obtained from the radar showed high accuracy in detecting beat-to-beat interval as small as 1 ms. Furthermore, the authors in [168] performed the HRV measurement experiment on 10 healthy subjects using a 24 GHz Doppler radar and novel algorithm. The measurement results show a maximum mean relative error of 2.03% for the beat-to-beat interval (BBI) acquisition.…”

Section: Heart Rate Variability Assessment Using Vital Signs Radarmentioning

confidence: 99%

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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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Section: Heart Rate Variability Assessment Using Vital Signs Radarmentioning

confidence: 99%

Section: Heart Rate Variability Assessment Using Vital Signs Radarmentioning

confidence: 99%

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

Kebe

Gadhafi

Mohammad

et al. 2020

Sensors

135

View full text Add to dashboard Cite

show abstract

“…After amplification and demodulation by the LNA and the subharmonic DC mixer, respectively, the corresponding Doppler frequency‐shift is quickly analyzed through the elegant algorithm of the DSP module. The used algorithms of the DSP are based on the theory and algorithms in References 1 and 2, Equations ) (which will be discussed later), the cross‐correlation method and the signal processing procedure in Reference 7, and the frequency and time domain analysis method for high‐accuracy estimation in Reference 8. This is the way to estimate the water flow velocity.…”

Section: Radar Architecturementioning

confidence: 99%

“…A 24 GHz ISM (industrial, scientific, and medical) band Doppler radar has been applied in many fields, such as weather forecasting, speed detection of vehicles, detection of incoming and outcoming aircrafts, discovery of new planets and stars, and measurement of heartbeat and blood pressure 7‐11 . However, there is no report of 24 GHz Doppler radar for water resource management applications.…”

Section: Introductionmentioning

confidence: 99%

A 24 GHz hydrology radar system capable of wide‐range surface velocity detection for water resource management applications

Lin

Chiu

Chang³

2020

Micro & Optical Tech Letters

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We demonstrate a 24 GHz hydrology radar system. The continuous‐wave Doppler radar is capable of noncontact and wide‐range surface‐flow velocity detection in various scenarios. The radar receives the reflected echo signal through a directional narrow‐beam antenna. After amplification and demodulation by the proposed low‐noise amplifier and the subharmonic down‐conversion mixer, respectively, the Doppler frequency‐shift is analyzed by the digital signal processing (DSP) module for estimation of the water flow velocity. Moreover, for water level detection, a phase‐locked loop with micro control unit (MCU)‐controlled division ratio is included in the RF module for generating a stable and tunable (or frequency modulation) 24‐GHz‐band transmitting signal with low phase noise. To verify the radar system, outdoor field tests have been conducted. The measured results are consistent with the theoretical values, and the results of both the float method and the commercial handheld (Stalker Pro II) surface velocity radar. In the condition of water ripple lower than 3 cm, the radar functions well for flow speed range of 0.3 ~ 34.6 m/s. Overall, the hydrology radar is suitable for surface‐flow velocity detection (especially in bad weather) and water resource management (such as water‐level detection).

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“…What's more, contact sensors can't be used for some special patients, such as infants or psychiatric patients who have sensitive skin, or burned patients who have damaged skin [8]. These problems of contact sensors can be overcome well by non-contact vital sign detection sensors [9]. For example, these non-contact detection sensors can achieve long-term detection of human without making them uncomfortable [10,11].…”

Section: Introductionmentioning

confidence: 99%

Accurate Doppler radar-based heart rate measurement using matched filter

Yang

Zhao

Huang

et al. 2020

IEICE Electron. Express

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To enhance the vital sign radar's detection accuracy of heartbeat rate (HR), which is heavily affected by the harmonics of respiration frequency, this paper proposes a waveform-driven matched filtering method based on polynomial fitting extraction. The merit of this approach lies in that, the quasi-ideal matching impulse approximating the actual heartbeat signal can be readily retrieved by subtracting the polynomial fitted waveform from a received signal, which provides high adaptability for individual subjects. Essentially, this extraction greatly removes the harmonic interference originated from respiration, thus considerably improving the HR detection accuracy. Simulations are performed to acquire the proper fitting order and the effective impulse duration. Guided by these two parameters, a 10-GHz non-contact continuous-wave (CW) Doppler radar system with typical microwave laboratory instruments is constructed. Experimental results confirmed the effectiveness of the proposed method, showing that the average errors of HR can be reduced from 46.21% to 0.96% under different subjects and distances, and from 38.05% to 0.90% in continuous measurement for one subject.

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High-Accuracy Real-Time Monitoring of Heart Rate Variability Using 24 GHz Continuous-Wave Doppler Radar

Cited by 125 publications

References 54 publications

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

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

A 24 GHz hydrology radar system capable of wide‐range surface velocity detection for water resource management applications

Accurate Doppler radar-based heart rate measurement using matched filter

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