Doppler radar vital sign detection with random body movement cancellation based on adaptive phase compensation

Gu, Changzhan; Wang, Guochao; Inoue, Takao; Li, Changzhi

doi:10.1109/mwsym.2013.6697618

Cited by 40 publications

(26 citation statements)

References 8 publications

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“…If the body is not stationary, its movement will also modulate the radar signal and will be mixed with heartbeat and respiration. The body movement is usually much larger than the heartbeat and respiration, which challenges the extraction of the expected vital sign signals [ 69 , 70 ]. The body movement may be removed in digital signal processing if it has a regular motion pattern.…”

Section: Recent Technical Advancementsmentioning

confidence: 99%

“…They are favorable for specific use cases where there is enough space to set up the sensors array. A radar-camera hybrid system using compensation was proposed in [ 69 , 70 ] to cancel the random body movement, the setup of which is shown in Figure 7 . This approach proves the feasibility of using an ordinary smart phone camera to help to cancel the body movement.…”

Section: Recent Technical Advancementsmentioning

confidence: 99%

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Short-Range Noncontact Sensors for Healthcare and Other Emerging Applications: A Review

2016

Sensors

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Short-range noncontact sensors are capable of remotely detecting the precise movements of the subjects or wirelessly estimating the distance from the sensor to the subject. They find wide applications in our day lives such as noncontact vital sign detection of heart beat and respiration, sleep monitoring, occupancy sensing, and gesture sensing. In recent years, short-range noncontact sensors are attracting more and more efforts from both academia and industry due to their vast applications. Compared to other radar architectures such as pulse radar and frequency-modulated continuous-wave (FMCW) radar, Doppler radar is gaining more popularity in terms of system integration and low-power operation. This paper reviews the recent technical advances in Doppler radars for healthcare applications, including system hardware improvement, digital signal processing, and chip integration. This paper also discusses the hybrid FMCW-interferometry radars and the emerging applications and the future trends.

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Section: Recent Technical Advancementsmentioning

confidence: 99%

Section: Recent Technical Advancementsmentioning

confidence: 99%

Short-Range Noncontact Sensors for Healthcare and Other Emerging Applications: A Review

2016

Sensors

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“…In the previous section, the reflection coefficient of an antenna is separated in two parts: , which is a large value and , which is a time variant variable with relatively small magnitude. The output voltage of a detector can be expressed with small signal analysis as (8) where is an arbitrary variable, can be considered as large signal, and is designated as small signal. Similarly, is the output voltage determined by a large signal, while is the output voltage due to a small signal.…”

Section: A Demodulating Narrowband Signalmentioning

confidence: 99%

“…Single continuous wave (CW) Doppler radar presents difficulties in detecting separate vital signs from multiple targets without using phased array [3] or multiple antenna sensors [7]. The most recent works on detection of random movement of a subject have utilized pulsed Doppler or FMCW radars, and video cameras [8]- [10], and a tag attached to a subject, which serves as a sensor beacon, has also been introduced [11]. Thus, it is clear that motion artifacts and multiple subject problems are a significant burden in radar type vital sign detection systems.…”

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confidence: 99%

Sensitivity Enhanced Vital Sign Detection Based on Antenna Reflection Coefficient Variation

Yun

Yook

2016

IEEE Trans. Biomed. Circuits Syst.

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This paper presents a vital sign detection sensor based on reflection coefficient variance from an antenna used in wireless communication devices. The near-field effect is estimated by performing 3D full-wave simulations using a dipole antenna and the magnitude variation of the reflection coefficient induced by human thorax movement due to heart and lungs is observed. The results support the possibility of vital sign detection based on the magnitude variation of the reflection coefficient from an antenna, which can be explained as a narrowband modulation scheme. In particular, a sensitivity enhancement method is proposed and analyzed, and experiments are carried out for heartbeat detection using a dipole antenna with the proposed system. Experimental results are compared between the direct detection and sensitivity enhancement detection schemes. FM signal is also applied to confirm that the proposed sensor works properly in conjunction with an existing communication system. The proposed cardiopulmonary detection sensor is implemented with off-the-shelf components at 2.4 GHz and excellent performance is obtained.

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“…However, in cases of extreme aliasing advanced noise cancellation techniques are required. Some works have been published addressing motion artifact due to body movement of the subject [3] . Some research addressed motion artifact due to hand shaking of radar sensor module itself during operation.…”

Section: Introductionmentioning

confidence: 99%

Signal processing techniques for vital sign monitoring using mobile short range doppler radar

Rahman

Yavari

Gao

et al. 2015

2015 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)

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This paper investigates mobile noncontact vital sign monitoring device for short range application. The radar module is mounted on a programmable linear stage, and precise stage movements are monitored by an optical tracking system. The motion artifacts due to radar system movements are removed using IIR filter and adaptive noise cancellation techniques. The system is capable of extracting respiration rate even in the presence of radar module motion. In many applications, vital sign measurement from a mobile platform will be very useful, i.e., using unmanned vehicle as a first responder in battlefield including other military and medical applications. Our experiments and theoretical techniques provide a baseline that can be potentially used to measure vital signs from any arbitrarily moving radar system.

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Doppler radar vital sign detection with random body movement cancellation based on adaptive phase compensation

Cited by 40 publications

References 8 publications

Short-Range Noncontact Sensors for Healthcare and Other Emerging Applications: A Review

Short-Range Noncontact Sensors for Healthcare and Other Emerging Applications: A Review

Sensitivity Enhanced Vital Sign Detection Based on Antenna Reflection Coefficient Variation

Signal processing techniques for vital sign monitoring using mobile short range doppler radar

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