Localization of Wearable Ultrawideband Antennas for Motion Capture Applications

Bharadwaj, Richa; Swaisaenyakorn, Srijittra; Parini, C.G.; Batchelor, John C.; Alomainy, Akram

doi:10.1109/lawp.2014.2309977

Cited by 32 publications

(29 citation statements)

References 15 publications

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“…Measurements were performed in the motion capture studio at the University of Kent, UK [16,22]. A human test subject 1.68 m tall and of average male build with a BMI of 21.3 was chosen for localising antennas on the body ( Fig.…”

Section: Measurement Set-upmentioning

confidence: 99%

“…1 (b), [24]) were used as transmitters placed on the body and also as receivers in the base stations [16]. The TSA antenna has dimensions of 27 mm × 16 mm and offers a return loss below -10 dB with good radiation performance and relatively constant gain across the UWB band when off, or on a human body [16]. The antennas were mounted on plastic frames with 3 reflective markers on each (Fig.…”

Section: Measurement Set-upmentioning

confidence: 99%

“…3D motion tracking products based upon miniature (MEMS) inertial sensors and UWB technology enables 5-8 cm positioning accuracy in an area of 20  20 m 2 [13]. High accuracy in the range of 1 to 5 cm has been reported in the open literature for short-range indoor UWB positioning systems [12][13][14][15][16][17] and in [12], sub-millimetre accuracy is achieved using a carrier based UWB localisation system. Thus UWB technology has widespread advantages in positioning systems making it a natural choice for localisation using body worn antennas.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [16][17] we studied the localisation of body worn antennas on the upper body of a human subject in uncluttered and realistic indoor environments. The promising high accuracy results (1 to 3 cm accuracy) of this investigation motivated a further detailed study in terms of motion tracking of the upper and lower limbs with whole body localisation focused for healthcare applications such as clinical motion analysis, physiotherapy and rehabilitation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impulse Radio Ultra-Wideband Communications for Localization and Tracking of Human Body and Limbs Movement for Healthcare Applications

Bharadwaj

Swaisaenyakorn

Parini

et al. 2017

IEEE Trans. Antennas Propagat.

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Abstract-Accurate and precise motion tracking of limbs and human subjects has technological importance in various healthcare applications. The use of Impulse Radio Ultra Wideband (UWB) technology due its inherent properties is of recent interest for high accuracy localisation. This paper presents experimental investigations and analysis of indoor human body localisation and tracking of limb movements in 3D based on IR-UWB technology using compact and cost-effective body worn antennas. The body-centric wireless channel characterisation has been analysed in detail using parameters such as path loss magnitude, number of multipath components, RMS delay spread, signal amplitude and Kurtosis with the main focus to differentiate between line-of-sight (LOS) and non-line-of-sight (NLOS) situations. Fidelity of the received signal is also calculated for different activities and antenna positions to study the pulse preserving nature of the UWB antenna when it is placed on the human body. The results reported in this paper have high localisation accuracy with 90 % in the range of 0.5 to 2.5 cm using simple and cost-effective techniques which is comparable to the results obtained by the standard optical motion capture system.

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Section: Measurement Set-upmentioning

confidence: 99%

Section: Measurement Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impulse Radio Ultra-Wideband Communications for Localization and Tracking of Human Body and Limbs Movement for Healthcare Applications

Bharadwaj

Swaisaenyakorn

Parini

et al. 2017

IEEE Trans. Antennas Propagat.

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“…These antennas must satisfy fundamental requirements like low cost, low profile, and directive radiation pattern. Various UWB antennas are designed and presented for wearable applications in [16][17][18][19][20][21][22]. To protect the human body from electromagnetic exposure, SAR values within acceptable range, and as specified by various regulating bodies like FCC, IEEE, and so forth [23,24], must be maintained by wearable antennas.…”

Section: Introductionmentioning

confidence: 99%

A Low Profile Ultrawide Band Monopole Antenna for Wearable Applications

Doddipalli

Kothari

Peshwe

2017

International Journal of Antennas and Propagation

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A low profile pentagonal shaped monopole antenna is designed and presented for wearable applications. The main objective of this paper is to design a miniaturized ultrawide band monopole planar antenna which can work efficiently in free space but also on the surface of the human body. The impact of human tissues on antenna performance is explained using the proposed pentagonal monopole antenna. The antenna is designed with a pentagonal radiator and a matched feed line of 50 ohm and square slots are integrated on defected ground of FR4 substrate with a size of 15 mm × 25 mm to achieve ultrawide band (UWB) performance in free space and human proximity. This overall design will enhance the antenna performance with wide bandwidth ranging from 2.9 GHz to 11 GHz. Specific absorption rate (SAR) of the proposed antenna on dispersive phantom model is also measured to observe the exposure of electromagnetic energy on human tissues. The simulated and measured results of the proposed antenna exhibit wide bandwidth and radiation characteristics in both free space and human proximity.

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From the Characterization of Ranging Error to the Enhancement of Nodes Localization for Group of Wireless Body Area Networks

et al. 2015

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International audienceTime-based localization in Wireless Body Area Networks (WBANs), has attracted growing research interest for the last past years. Nodes positions can be estimated based on peer-to-peer radio transactions between devices. Indeed, the accuracy of the localization process could be highly affected by different factors , such as the WBAN channels where the signal is propagating through, as well as the nodes mobility that bias the peer-to-peer range estimation, and thus, the final achieved localization accuracy. The goal of this paper consists in characterizing the impact of mobility and WBAN channel on the ranging and localization estimation, based on real mobility traces acquired through a motion capture system. More specifically, the ranging error is evaluated over all the WBANs links (i.e. on-body, off-body and body-to-body links), while an impulse Radio Ultra-Wideband (IR-UWB) physical layer, as well as a TDMA-based Medium Access Control (MAC) are playing on. The simulation results show that the range measurement error can be modeled as a Gaussian distribution. To deal with the gaus-sianity observation of ranging error and to provide high positioning accuracy, an adjustable extended Kalman Filter (EKF) is proposed

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Localization of Wearable Ultrawideband Antennas for Motion Capture Applications

Cited by 32 publications

References 15 publications

Impulse Radio Ultra-Wideband Communications for Localization and Tracking of Human Body and Limbs Movement for Healthcare Applications

Impulse Radio Ultra-Wideband Communications for Localization and Tracking of Human Body and Limbs Movement for Healthcare Applications

A Low Profile Ultrawide Band Monopole Antenna for Wearable Applications

From the Characterization of Ranging Error to the Enhancement of Nodes Localization for Group of Wireless Body Area Networks

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