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GNSS Multipath Detection Using Continuous Time-Series C/N(0)

The reduction of multipath errors is a significant challenge in the Global Navigation Satellite System (GNSS), especially when receiving non-line-of-sight (NLOS) signals. However, selecting line-of-sight (LOS) satellites correctly is still a difficult task in dense urban areas, even with the latest...

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Detalles Bibliográficos
Autores principales: Kubo, Nobuaki, Kobayashi, Kaito, Furukawa, Rei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7411688/
https://www.ncbi.nlm.nih.gov/pubmed/32708257
http://dx.doi.org/10.3390/s20144059
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author Kubo, Nobuaki
Kobayashi, Kaito
Furukawa, Rei
author_facet Kubo, Nobuaki
Kobayashi, Kaito
Furukawa, Rei
author_sort Kubo, Nobuaki
collection PubMed
description The reduction of multipath errors is a significant challenge in the Global Navigation Satellite System (GNSS), especially when receiving non-line-of-sight (NLOS) signals. However, selecting line-of-sight (LOS) satellites correctly is still a difficult task in dense urban areas, even with the latest GNSS receivers. This study demonstrates a new method of utilization of C/N(0) of the GNSS to detect NLOS signals. The elevation-dependent threshold of the C/N(0) setting may be effective in mitigating multipath errors. However, the C/N(0) fluctuation affected by NLOS signals is quite large. If the C/N(0) is over the threshold, the satellite is used for positioning even if it is still affected by the NLOS signal, which causes the positioning error to jump easily. To overcome this issue, we focused on the value of continuous time-series C/N(0) for a certain period. If the C/N(0) of the satellite was less than the determined threshold, the satellite was not used for positioning for a certain period, even if the C/N(0) recovered over the threshold. Three static tests were conducted at challenging locations near high-rise buildings in Tokyo. The results proved that our method could substantially mitigate multipath errors in differential GNSS by appropriately removing the NLOS signals. Therefore, the performance of real-time kinematic GNSS was significantly improved.
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spelling pubmed-74116882020-08-25 GNSS Multipath Detection Using Continuous Time-Series C/N(0) Kubo, Nobuaki Kobayashi, Kaito Furukawa, Rei Sensors (Basel) Article The reduction of multipath errors is a significant challenge in the Global Navigation Satellite System (GNSS), especially when receiving non-line-of-sight (NLOS) signals. However, selecting line-of-sight (LOS) satellites correctly is still a difficult task in dense urban areas, even with the latest GNSS receivers. This study demonstrates a new method of utilization of C/N(0) of the GNSS to detect NLOS signals. The elevation-dependent threshold of the C/N(0) setting may be effective in mitigating multipath errors. However, the C/N(0) fluctuation affected by NLOS signals is quite large. If the C/N(0) is over the threshold, the satellite is used for positioning even if it is still affected by the NLOS signal, which causes the positioning error to jump easily. To overcome this issue, we focused on the value of continuous time-series C/N(0) for a certain period. If the C/N(0) of the satellite was less than the determined threshold, the satellite was not used for positioning for a certain period, even if the C/N(0) recovered over the threshold. Three static tests were conducted at challenging locations near high-rise buildings in Tokyo. The results proved that our method could substantially mitigate multipath errors in differential GNSS by appropriately removing the NLOS signals. Therefore, the performance of real-time kinematic GNSS was significantly improved. MDPI 2020-07-21 /pmc/articles/PMC7411688/ /pubmed/32708257 http://dx.doi.org/10.3390/s20144059 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kubo, Nobuaki
Kobayashi, Kaito
Furukawa, Rei
GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title_full GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title_fullStr GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title_full_unstemmed GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title_short GNSS Multipath Detection Using Continuous Time-Series C/N(0)
title_sort gnss multipath detection using continuous time-series c/n(0)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7411688/
https://www.ncbi.nlm.nih.gov/pubmed/32708257
http://dx.doi.org/10.3390/s20144059
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