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GNSS multipath detection using three-frequency signal-to-noise measurements

Strode, PRR; Groves, PD; (2016) GNSS multipath detection using three-frequency signal-to-noise measurements. GPS Solutions , 20 (3) pp. 399-412. 10.1007/s10291-015-0449-1. Green open access

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Abstract

A new technique for detecting GNSS multipath interference by comparing signal-to-noise (SNR) measurements on three frequencies is presented. Depending on the phase lag of the reflected signal with respect to the direct signal, multipath interference can be either constructive or destructive, with a commensurate effect on the measured SNR. However, as the phase lag is frequency dependent, the SNR is perturbed differently on each frequency. Thus, by differencing SNR measurements on different frequencies and comparing the result with that obtained in a low-multipath environment, multipath can be detected. Using three frequencies makes the process more robust. A three-frequency SNR-based multipath detector has been developed and calibrated using measurements from GPS Block IIF satellites in a low-multipath environment. The new detector has been tested in a range of urban environments and its multipath detection capability verified by showing that the MP observables oscillate when the new detection statistic is above a threshold value determined using data collected in a low-multipath environment. The new detector is also sensitive to diffraction.

Type: Article
Title: GNSS multipath detection using three-frequency signal-to-noise measurements
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10291-015-0449-1
Publisher version: http://dx.doi.org/10.1007/s10291-015-0449-1
Language: English
Additional information: The final publication is available at Springer via http://dx.doi.org/10.1007/s10291-015-0449-1.
Keywords: GNSS, Multipath, Signal-to-noise ratio
UCL classification: UCL
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/1464101
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