Indoor localization with audible sound - Towards practical implementation

• Type: Article in International Scientific Journal
• Date: 2016

Authors

João Moutinho (Author) FEUP; Rui Esteves Araújo (Author) FEUP; Freitas, D (Author) Other

Journal

Title: Pervasive and Mobile Computing

Vol. 29

Pages: 1-16

ISSN: 1574-1192

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 23 Citations

Other information

Authenticus ID: P-00K-9SF

DOI: 10.1016/j.pmcj.2015.10.016

Abstract (EN): This paper presents an innovative evaluation and comparison of several methods and techniques necessary to implement an indoor localization system based on audible sound. Experiments were conducted in a room with conditions very close to possible practical application demonstrating that time delay estimation using generalized cross-correlation phase transform provides the best estimate to the distance to fixed anchors, and highlight the benefits of a new localization method entitled circle shrinking based on an optimization methodology. Of the three optimization methods tested, Gauss-Newton proves to be the most adequate, and among the three medium access methods evaluated, code division multiple access acoustic transmission provided the best results. A localization system combining these components and using only off-the-shelf hardware reached an average accuracy of 1.3 cm in the central area of the test room with an excitation signal-to-noise ratio as low as 7.2 dB, an almost unperceivable noise like audio signal. These results represent an advance of the state-of-the-art in indoor localization systems, pointing towards the possibility of widespread practical implementation with everyday use components.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16