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Smartphone Shadow Matching for Better Cross-street GNSS Positioning in Urban Environments

Wang, L; Groves, PD; Ziebart, MK; (2015) Smartphone Shadow Matching for Better Cross-street GNSS Positioning in Urban Environments. Journal of Navigation , 68 (3) 411- 433. 10.1017/S0373463314000836. Green open access

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Abstract

Global Navigation Satellite System (GNSS) shadow matching is a new positioning technique that determines position by comparing the measured signal availability and strength with predictions made using a three-dimensional (3D) city model. It complements conventional GNSS positioning and can significantly improve cross-street positioning accuracy in dense urban environments. This paper describes how shadow matching has been adapted to work on an Android smartphone and presents the first comprehensive performance assessment of smartphone GNSS shadow matching. Using GPS and GLONASS data recorded at 20 locations within central London, it is shown that shadow matching significantly outperforms conventional GNSS positioning in the cross-street direction. The success rate for obtaining a cross-street position accuracy within 5 m, enabling the correct side of a street to be determined, was 54·50% using shadow matching, compared to 24·77% for the conventional GNSS position. The likely performance of four-constellation shadow matching is predicted, the feasibility of a large-scale implementation of shadow matching is assessed, and some methods for improving performance are proposed. A further contribution is a signal-to-noise ratio analysis of the direct line-of-sight and non-line-of-sight signals received on a smartphone in a dense urban environment.

Type: Article
Title: Smartphone Shadow Matching for Better Cross-street GNSS Positioning in Urban Environments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S0373463314000836
Publisher version: http://dx.doi.org/10.1017/S0373463314000836
Language: English
Additional information: This article has been accepted for publication and will appear in a revised form, subsequent to peer review and/or editorial input by Cambridge University Press, in The Journal of Navigation published by Cambridge University Press. 'Wang, L; Groves, PD; Ziebart, MK; (2014) Smartphone Shadow Matching for Better Cross-street GNSS Positioning in Urban Environments. Journal of Navigation 1 - 23. 10.1017/S0373463314000836. (In press). http://dx.doi.org/10.1017/S0373463314000836
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1458626
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