IEEE J Biomed Health Inform - Ambulatory measurement of three-dimensional foot displacement during treadmill walking using wearable wireless ultrasonic sensor network.

Tópicos

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Resumo

Techniques that could be used to monitor human motion precisely are helpful in various applications such as rehabilitation, gait analysis, and athletic performance analysis. This paper focuses on the 3-D foot trajectory measurements based on a wearable wireless ultrasonic sensor network. The system consists of an ultrasonic transmitter (mobile) and several receivers (anchors) with fixed known positions. In order not to restrict the movement of subjects, a radio frequency (RF) module is used for wireless data transmission. The RF module also provides the synchronization clock between mobile and anchors. The proposed system measures the time-of-arrival (TOA) of the ultrasonic signal from mobile to anchors. Together with the knowledge of the anchor's position, the absolute distance that the signal travels can be computed. Then, the range information defines a circle centered at this anchor with radius equal to the measured distance, and the mobile resides within the intersections of several such circles. Based on the TOA-based tracking technique, the 3-D foot trajectories are validated against a camera-based motion capture system for ten healthy subjects walking on a treadmill at slow, normal, and fast speeds. The experimental results have shown that the ultrasonic system has sufficient accuracy of net root-mean-square error ( 4.2 cm) for 3-D displacement, especially for foot clearance with accuracy and standard deviation ( 0.62 ?7.48 mm) compared to the camera-based motion capture system. The small form factor and lightweight feature of the proposed system make it easy to use. Such a system is also much lower in cost compared to the camera-based tracking system.

Resumo Limpo

techniqu use monitor human motion precis help various applic rehabilit gait analysi athlet perform analysi paper focus d foot trajectori measur base wearabl wireless ultrason sensor network system consist ultrason transmitt mobil sever receiv anchor fix known posit order restrict movement subject radio frequenc rf modul use wireless data transmiss rf modul also provid synchron clock mobil anchor propos system measur timeofarriv toa ultrason signal mobil anchor togeth knowledg anchor posit absolut distanc signal travel can comput rang inform defin circl center anchor radius equal measur distanc mobil resid within intersect sever circl base toabas track techniqu d foot trajectori valid camerabas motion captur system ten healthi subject walk treadmil slow normal fast speed experiment result shown ultrason system suffici accuraci net rootmeansquar error cm d displac especi foot clearanc accuraci standard deviat mm compar camerabas motion captur system small form factor lightweight featur propos system make easi use system also much lower cost compar camerabas track system

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