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Sensors 2013, 13(9), 11728-11749; doi:10.3390/s130911728

A Telemetry System Embedded in Clothes for Indoor Localization and Elderly Health Monitoring

1
CNRS, LAAS, 7 Avenue du Colonel Roche, Toulouse F-31400, France
2
Univ de Toulouse, UPS, UTM, LAAS, Toulouse F-31400, France
3
LCIS, Grenoble-INP, Université Pierre Mendès, 50, rue Barthélémy de Laffemas BP54–F-26902 Valence, France
*
Author to whom correspondence should be addressed.
Received: 14 July 2013 / Revised: 2 August 2013 / Accepted: 29 August 2013 / Published: 4 September 2013
(This article belongs to the Special Issue Wearable Gait Sensors)

Abstract

This paper presents a telemetry system used in a combined trilateration method for the precise indoor localization of the elderly who need health monitoring. The system is based on the association of two wireless technologies: ultrasonic and 802.15.4. The use of the 802.15.4 RF signal gives the reference starting time of the ultrasonic emission (time difference of arrival method). A time of flight measurement of the ultrasonic pulses provides the distances between the mobile node and three anchor points. These distance measurements are then used to locate the mobile node using the trilateration method with an accuracy of a few centimetres. The originality of our work lies in embedding the mobile node in clothes. The system is embedded in clothes in two ways: on a shoe in order to form a “smart” shoe and in a hat in order to form a “smart” hat. Both accessories allow movements, gait speed and distance covered to be monitored for health applications. Experiments in a test room are presented to show the effectiveness of our system. View Full-Text
Keywords: wireless sensors; telemetry; low power; ultrasonic; localization; 802.15.4; elderly health monitoring wireless sensors; telemetry; low power; ultrasonic; localization; 802.15.4; elderly health monitoring
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Charlon, Y.; Fourty, N.; Campo, E. A Telemetry System Embedded in Clothes for Indoor Localization and Elderly Health Monitoring. Sensors 2013, 13, 11728-11749.

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