Jiang, Z; Groves, PD; (2012) NLOS GPS signal detection using a dual-polarisation antenna. GPS Solutions 1 - 12. 10.1007/s10291-012-0305-5.

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Abstract

The reception of indirect signals, either in the form of non-line-of-sight (NLOS) reception or multipath interference, is a major cause of GNSS position errors in urban environments. We explore the potential of using dual-polarisation antenna technology for detecting and mitigating the reception of NLOS signals and severe multipath interference. The new technique computes the value of the carrier-power-to-noise-density (C/N0) measurements from left-hand circular polarised outputs subtracted from the right-hand circular polarised C/N0 counterpart. If this quality is negative, NLOS signal reception is assumed. If the C/N0 difference is positive, but falls below a threshold based on its lower bound in an open-sky environment, severe multipath interference is assumed. Results from two experiments are presented. Open-field testing was first performed to characterise the antenna behaviour and determine a suitable multipath detection threshold. The techniques were then tested in a dense urban area. Using the new method, two signals in the urban data were identified as NLOS-only reception during the occupation period at one station, while the majority of the remaining signals present were subject to a mixture of NLOS reception and severe multipath interference. The point positioning results were dramatically improved by excluding the detected NLOS measurements. The new technique is suited to a wide range of static ground applications based on our results.

Type:	Article
Title:	NLOS GPS signal detection using a dual-polarisation antenna
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1007/s10291-012-0305-5
Publisher version:	http://dx.doi.org/10.1007/s10291-012-0305-5
Language:	English
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/1394448

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• NLOS GPS signal detection using a dual-polarisation antenna. (deposited 14 Jan 2013 20:39)
  • NLOS GPS signal detection using a dual-polarisation antenna. (deposited 03 Jun 2013 10:02) [Currently Displayed]

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