Dual-Frequency Technique for Assessment of Cardiopulmonary Effective RCS and Displacement

Kiriazi, John E.; Borić–Lubecke, Olga; Lubecke, Victor M.

doi:10.1109/jsen.2011.2124454

Cited by 38 publications

(17 citation statements)

References 14 publications

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“…This can be explained by the fact that the motion of the heart translated to the front is much stronger than that to the back. This result also coincides with analysis of cardiopulmonary ERCS in the vital sign monitoring with Doppler radar system [32].…”

Section: Discussionsupporting

confidence: 88%

“…By comparing Figures 9(a) and (b), the respiratory-motion response of face to back position is still weaker than that of face to face position. Different detected displacement magnitude of chest cavity in these two positions may be the reason for this phenomenon [32]. Moreover, Figure 9(c) shows that range of respiratory-motion response along the fast-time is wider than that of other two positions.…”

Section: Discussionmentioning

confidence: 92%

“…In this figure, face to face position has the best respiratorymotion response, and respiratory-motion response of the face to side position is much weaker than that of the other two positions. This is because the face to side position has the smallest effective radar cross section (ERCS) of respiration [32]. By comparing Figures 9(a) and (b), the respiratory-motion response of face to back position is still weaker than that of face to face position.…”

Section: Discussionmentioning

confidence: 94%

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A New Method for Non-Line-of-Sight Vital Sign Monitoring Based on Developed Adaptive Line Enhancer Using Low Centre Frequency Uwb Radar

Li¹,

Zhao²,

Lv³

et al. 2013

PIER

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Abstract-The physiological parameters monitoring of human target are considered to be a meaningful and challenging task in non-lineof-sight (NLOS) scenes such as rescue of trapped survivors in postdisaster. In this paper, a new method based on developed adaptive line enhancer (DALE) is proposed to monitor vital signs via ultra-wideband (UWB) radar with centre frequency of 400 MHz. The validity of this new method is proved by means of two experiments with different positions of human target. The good results demonstrate that this new method can be used for vital sign monitoring including respiration and heartbeat through the obstacle. Furthermore, the motion responses due to respiration and heartbeat in different body positions are also discussed.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 94%

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A New Method for Non-Line-of-Sight Vital Sign Monitoring Based on Developed Adaptive Line Enhancer Using Low Centre Frequency Uwb Radar

Li¹,

Zhao²,

Lv³

et al. 2013

PIER

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“…If the system contribution A r is known, σ can be estimated from this arc in the complex plane, which was done in 9 and. 15 A straight forward RCS measurement of a person will result in just that; the RCS of the person, but not of the vital signs. A better solution would be to estimate the phase φ m (t) of the moving chest and characterizing it through for instance the phase modulation index h = ∆φ m , where ∆φ m is the peak deviation from the mean phase.…”

Section: Re Immentioning

confidence: 99%

Radar sensitivity to human heartbeats and respiration

Aardal

Brovoll

Paichard

et al. 2015

Radar Sensor Technology XIX; And Active and Passive Signatures VI

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Human heartbeats and respiration can be detected from a distance using radar. This can be used for medical applications and human being detection. It is useful to have a system independent measure of how detectable the vital signs are. In radar applications, the Radar Cross Section (RCS) is normally used to characterize the detectability of an object. Since the human vital signs are seen by the radar as movements of the torso, the modulations in the person RCS can be used as a system independent measure of the vital signs detectability.In this paper, measurements of persons seated in an anechoic chamber are presented. The measurements were calibrated using empty room and a metallic calibration sphere. A narrowband radar operating at frequencies from 500 MHz to 18 GHz in discrete steps was used. A turntable provided measurements at precise aspect angles all around the person under test.In an I & Q receiver, the heartbeat and respiration modulation is a combination of amplitude and phase mod-modulations. The measurements were filtered, leaving the modulations from the vital signs in the radar recordings. The procedure for RCS computation was applied to these filtered data, capturing the complex signatures. It was found that both the heartbeat and respiration detectability increase with increasing frequency. The heartbeat signatures are almost equal from the front and the back, while being almost undetectable from the sides of the person. The respiration signatures are slightly higher from the front than from the back, and smaller from the sides.The signature measurements presented in this paper provide an objective system independent measure of the detectability of human vital signs as a function of frequency and aspect angle. These measures are useful for example in system design and in assessing real measurement scenarios.

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“…Non-contact monitoring of human vital signs using a Doppler radar has been proposed for many decades, Since the 1970s, microwave Doppler radar has drawn attention for new applications on human healthcare [6,7], with initial applications in apnea and respiration monitoring [8], later, wireless heart monitoring [9]. Besides, A large number of clinical experiments show that microwave Doppler radar can accurately monitor cardiopulmonary activity [10], which can replace the conventional cardiopulmonary monitoring products [11,12]. This paper designed a non-contact RF sensor working at 2.45 GHz for non-contact monitoring vital signs [13,14].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a 2.45 GHz RF Sensor for Non:contacting Monitoring Vital Signs

et al. 2016

2016 Computing in Cardiology Conference (CinC)

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Dual-Frequency Technique for Assessment of Cardiopulmonary Effective RCS and Displacement

Cited by 38 publications

References 14 publications

A New Method for Non-Line-of-Sight Vital Sign Monitoring Based on Developed Adaptive Line Enhancer Using Low Centre Frequency Uwb Radar

A New Method for Non-Line-of-Sight Vital Sign Monitoring Based on Developed Adaptive Line Enhancer Using Low Centre Frequency Uwb Radar

Radar sensitivity to human heartbeats and respiration

Design and Implementation of a 2.45 GHz RF Sensor for Non:contacting Monitoring Vital Signs

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