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Shadow Matching: A New GNSS Positioning Technique for Urban Canyons

Groves, PD; (2011) Shadow Matching: A New GNSS Positioning Technique for Urban Canyons. Journal of Navigation , 64 (3) 417 - 430. 10.1017/S0373463311000087. Green open access

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Abstract

The Global Positioning System (GPS) is unreliable in dense urban areas, known as urban canyons, which have tall buildings or narrow streets. This is because the buildings block the signals from many of the satellites. Combining UPS with other Global Navigation Satellite Systems (GNSS) significantly increases the availability of direct line-of-sight signals. Modelling is used to demonstrate that, although this will enable accurate positioning along the direction of the street, the positioning accuracy in the cross-street direction will be poor because the unobstructed satellite signals travel along the street, rather than across it. A novel solution to this problem is to use 3D building models to improve cross-track positioning accuracy in urban canyons by predicting which satellites are visible from different locations and comparing this with the measured satellite visibility to determine position. Modelling is used to show that this shadow matching technique has the potential to achieve metre-order cross-street positioning in urban canyons. The issues to be addressed in developing a robust and practical shadow matching positioning system are then discussed and solutions proposed.

Type: Article
Title: Shadow Matching: A New GNSS Positioning Technique for Urban Canyons
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S0373463311000087
Publisher version: http://dx.doi.org/10.1017/S0373463311000087
Language: English
Additional information: © 2011 The Royal Institute of Navigation
Keywords: GNSS, Digital Maps, Urban Canyon
UCL classification: UCL
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/1308009
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