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Multipath mitigation and NLOS detection using vector tracking in urban environments

Hsu, L-T; Jan, S-S; Groves, PD; Kubo, N; (2014) Multipath mitigation and NLOS detection using vector tracking in urban environments. GPS Solutions , 19 (2) 249- 262. 10.1007/s10291-014-0384-6. Green open access

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Abstract

Multipath interference and non-line-of-sight (NLOS) reception are major error sources when using global navigation satellite systems in urban environments. A promising approach to minimize the effect of multipath interference and aid NLOS detection is vector tracking. Therefore, the objective of this research was to assess vector tracking in a dense urban environment to determine its effect on multipath interference and NLOS reception. Here, a vector delay lock loop is implemented using an adaptive extended Kalman filter. This replaces the individual code-tracking loops and navigation filter, but retains conventional carrier frequency tracking. The positioning and tracking performance of the conventional and vector-tracking implementations with and without a strobe correlator are compared using intermediate frequency signals recorded in the Koto-Ku district of urban canyon Tokyo city environment. Both static and dynamic tests were performed. It is shown that vector tracking reduces the root-mean-square positioning error by about 30 % compared with an equivalent conventional receiver in urban environments and is capable of detecting long-delay NLOS reception for a GPS receiver without any external aiding. © 2014 Springer-Verlag Berlin Heidelberg.

Type: Article
Title: Multipath mitigation and NLOS detection using vector tracking in urban environments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10291-014-0384-6
Publisher version: http://dx.doi.org/10.1007/s10291-014-0384-6
Language: English
Additional information: The final publication is available at Springer via http://dx.doi.org/10.1007/s10291-014-0384-6
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/1432908
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