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Sensors 2017, 17(3), 592;

An Alternative Wearable Tracking System Based on a Low-Power Wide-Area Network

Department of Electronic Engineering, Universitat Politècnica de Catalunya, Colom 1, 08222 Terrassa, Spain
Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 30 January 2017 / Revised: 9 March 2017 / Accepted: 10 March 2017 / Published: 14 March 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2016)
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This work presents an alternative wearable tracking system based on a low-power wide area network. A complete GPS receiver was integrated with a textile substrate, and the latitude and longitude coordinates were sent to the cloud by means of the SIM-less SIGFOX network. To send the coordinates over SIGFOX protocol, a specific codification algorithm was used and a customized UHF antenna on jeans fabric was designed, simulated and tested. Moreover, to guarantee the compliance to international regulations for human body exposure to electromagnetic radiation, the electromagnetic specific absorption rate of this antenna was analyzed. A specific remote server was developed to decode the latitude and longitude coordinates. Once the coordinates have been decoded, the remote server sends this information to the open source data viewer SENTILO to show the location of the sensor node in a map. The functionality of this system has been demonstrated experimentally. The results guarantee the utility and wearability of the proposed tracking system for the development of sensor nodes and point out that it can be a low cost alternative to other commercial products based on GSM networks. View Full-Text
Keywords: wearable; wireless sensor node; textile antenna; GPS; SIGFOX; SENTILO wearable; wireless sensor node; textile antenna; GPS; SIGFOX; SENTILO

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Fernández-Garcia, R.; Gil, I. An Alternative Wearable Tracking System Based on a Low-Power Wide-Area Network. Sensors 2017, 17, 592.

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