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Sensors 2015, 15(12), 32168-32187;

Design, Implementation and Evaluation of an Indoor Navigation System for Visually Impaired People

Department of Information and Communication Technologies, Universidad Politécnica de Cartagena, Campus Muralla del Mar, Cartagena E-30202, Spain
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editors: Kourosh Khoshelham and Sisi Zlatanova
Received: 1 October 2015 / Revised: 16 December 2015 / Accepted: 17 December 2015 / Published: 21 December 2015
(This article belongs to the Special Issue Sensors for Indoor Mapping and Navigation)
Full-Text   |   PDF [4257 KB, uploaded 21 December 2015]   |  


Indoor navigation is a challenging task for visually impaired people. Although there are guidance systems available for such purposes, they have some drawbacks that hamper their direct application in real-life situations. These systems are either too complex, inaccurate, or require very special conditions (i.e., rare in everyday life) to operate. In this regard, Ultra-Wideband (UWB) technology has been shown to be effective for indoor positioning, providing a high level of accuracy and low installation complexity. This paper presents SUGAR, an indoor navigation system for visually impaired people which uses UWB for positioning, a spatial database of the environment for pathfinding through the application of the A* algorithm, and a guidance module. The interaction with the user takes place using acoustic signals and voice commands played through headphones. The suitability of the system for indoor navigation has been verified by means of a functional and usable prototype through a field test with a blind person. In addition, other tests have been conducted in order to show the accuracy of different relevant parts of the system. View Full-Text
Keywords: UWB; Ubisense; indoor navigation; visually impaired; SUGAR UWB; Ubisense; indoor navigation; visually impaired; SUGAR

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Martinez-Sala, A.S.; Losilla, F.; Sánchez-Aarnoutse, J.C.; García-Haro, J. Design, Implementation and Evaluation of an Indoor Navigation System for Visually Impaired People. Sensors 2015, 15, 32168-32187.

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