Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region

Detalhes bibliográficos
Autor(a) principal: Jerez, Gabriel O. [UNESP]
Data de Publicação: 2022
Outros Autores: Hernández-Pajares, Manuel, Goss, Andreas, da Silva, Crislaine Menezes [UNESP], Alves, Daniele B. M. [UNESP], Monico, João F. G. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1007/s10291-022-01228-0
http://hdl.handle.net/11449/230289
Resumo: The vertical total electron content (VTEC) is one of the key quantities to describe variations of the ionosphere and can be provided to users to correct the ionospheric disturbances for GNSS (Global Navigation Satellite System) positioning. The VTEC values and the corresponding standard deviations are routinely provided in the so-called Global Ionosphere Maps (GIM), with a typical time resolution of 2 h (and up to 15 min) on regular grids with 2.5º resolution in latitude and 5º resolution in longitude. To determine the ionospheric corrections from the GIMs for positioning applications, an interpolation has to be applied to the VTEC grid values, which generally degenerates the final VTEC accuracy. In this context, the typically applied bi-linear interpolation of the VTEC values is calculated by introducing a new weighting scheme by means of the standard deviation maps in the ionospheric domain. In the sequel, the impact of the use of the VTEC uncertainties for the interpolation procedure is applied to the GIMs of different centers and assessed in the ionospheric and in the positioning domain. For the assessment of the GIM in the ionospheric domain, the VTEC values calculated are compared with VTEC directly obtained from the given GIM, i.e., without interpolation. In the positioning domain, the impact of the VTEC uncertainties is analyzed by means of single-frequency precise point positioning (PPP), considering four Brazilian stations in challenging regions. The use of the standard deviation values in positioning provides a significant improvement in periods of high solar flux, especially for stations in the region under more intense ionospheric effect (mean rates of improvements up to 47%).
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spelling Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude regionEquatorial regionGlobal ionospheric mapsGNSS positioningIonospherePPPThe vertical total electron content (VTEC) is one of the key quantities to describe variations of the ionosphere and can be provided to users to correct the ionospheric disturbances for GNSS (Global Navigation Satellite System) positioning. The VTEC values and the corresponding standard deviations are routinely provided in the so-called Global Ionosphere Maps (GIM), with a typical time resolution of 2 h (and up to 15 min) on regular grids with 2.5º resolution in latitude and 5º resolution in longitude. To determine the ionospheric corrections from the GIMs for positioning applications, an interpolation has to be applied to the VTEC grid values, which generally degenerates the final VTEC accuracy. In this context, the typically applied bi-linear interpolation of the VTEC values is calculated by introducing a new weighting scheme by means of the standard deviation maps in the ionospheric domain. In the sequel, the impact of the use of the VTEC uncertainties for the interpolation procedure is applied to the GIMs of different centers and assessed in the ionospheric and in the positioning domain. For the assessment of the GIM in the ionospheric domain, the VTEC values calculated are compared with VTEC directly obtained from the given GIM, i.e., without interpolation. In the positioning domain, the impact of the VTEC uncertainties is analyzed by means of single-frequency precise point positioning (PPP), considering four Brazilian stations in challenging regions. The use of the standard deviation values in positioning provides a significant improvement in periods of high solar flux, especially for stations in the region under more intense ionospheric effect (mean rates of improvements up to 47%).Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Department of Cartography São Paulo State University (UNESP), São PauloDepartment of Mathematics UPC-IonSAT and UPC-IEEC Research Groups Universitat Politècnica de Catalunya (UPC)Deutsches Geodätisches Forschungsinstitut der Technischen Universität München, Arcisstraße 21Department of Cartography São Paulo State University (UNESP), São PauloCAPES: (CAPES-PrInt) Process number: 88887.310463/2018-00 | Mobility number: 88887.370704/2019-00CAPES: Finance Code 001Universidade Estadual Paulista (UNESP)Universitat Politècnica de Catalunya (UPC)Deutsches Geodätisches Forschungsinstitut der Technischen Universität MünchenJerez, Gabriel O. [UNESP]Hernández-Pajares, ManuelGoss, Andreasda Silva, Crislaine Menezes [UNESP]Alves, Daniele B. M. [UNESP]Monico, João F. G. [UNESP]2022-04-29T08:38:52Z2022-04-29T08:38:52Z2022-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1007/s10291-022-01228-0GPS Solutions, v. 26, n. 2, 2022.1521-18861080-5370http://hdl.handle.net/11449/23028910.1007/s10291-022-01228-02-s2.0-85123642657Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGPS Solutionsinfo:eu-repo/semantics/openAccess2024-06-18T15:01:08Zoai:repositorio.unesp.br:11449/230289Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:09:06.915898Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
title Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
spellingShingle Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
Jerez, Gabriel O. [UNESP]
Equatorial region
Global ionospheric maps
GNSS positioning
Ionosphere
PPP
title_short Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
title_full Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
title_fullStr Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
title_full_unstemmed Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
title_sort Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region
author Jerez, Gabriel O. [UNESP]
author_facet Jerez, Gabriel O. [UNESP]
Hernández-Pajares, Manuel
Goss, Andreas
da Silva, Crislaine Menezes [UNESP]
Alves, Daniele B. M. [UNESP]
Monico, João F. G. [UNESP]
author_role author
author2 Hernández-Pajares, Manuel
Goss, Andreas
da Silva, Crislaine Menezes [UNESP]
Alves, Daniele B. M. [UNESP]
Monico, João F. G. [UNESP]
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Universitat Politècnica de Catalunya (UPC)
Deutsches Geodätisches Forschungsinstitut der Technischen Universität München
dc.contributor.author.fl_str_mv Jerez, Gabriel O. [UNESP]
Hernández-Pajares, Manuel
Goss, Andreas
da Silva, Crislaine Menezes [UNESP]
Alves, Daniele B. M. [UNESP]
Monico, João F. G. [UNESP]
dc.subject.por.fl_str_mv Equatorial region
Global ionospheric maps
GNSS positioning
Ionosphere
PPP
topic Equatorial region
Global ionospheric maps
GNSS positioning
Ionosphere
PPP
description The vertical total electron content (VTEC) is one of the key quantities to describe variations of the ionosphere and can be provided to users to correct the ionospheric disturbances for GNSS (Global Navigation Satellite System) positioning. The VTEC values and the corresponding standard deviations are routinely provided in the so-called Global Ionosphere Maps (GIM), with a typical time resolution of 2 h (and up to 15 min) on regular grids with 2.5º resolution in latitude and 5º resolution in longitude. To determine the ionospheric corrections from the GIMs for positioning applications, an interpolation has to be applied to the VTEC grid values, which generally degenerates the final VTEC accuracy. In this context, the typically applied bi-linear interpolation of the VTEC values is calculated by introducing a new weighting scheme by means of the standard deviation maps in the ionospheric domain. In the sequel, the impact of the use of the VTEC uncertainties for the interpolation procedure is applied to the GIMs of different centers and assessed in the ionospheric and in the positioning domain. For the assessment of the GIM in the ionospheric domain, the VTEC values calculated are compared with VTEC directly obtained from the given GIM, i.e., without interpolation. In the positioning domain, the impact of the VTEC uncertainties is analyzed by means of single-frequency precise point positioning (PPP), considering four Brazilian stations in challenging regions. The use of the standard deviation values in positioning provides a significant improvement in periods of high solar flux, especially for stations in the region under more intense ionospheric effect (mean rates of improvements up to 47%).
publishDate 2022
dc.date.none.fl_str_mv 2022-04-29T08:38:52Z
2022-04-29T08:38:52Z
2022-04-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1007/s10291-022-01228-0
GPS Solutions, v. 26, n. 2, 2022.
1521-1886
1080-5370
http://hdl.handle.net/11449/230289
10.1007/s10291-022-01228-0
2-s2.0-85123642657
url http://dx.doi.org/10.1007/s10291-022-01228-0
http://hdl.handle.net/11449/230289
identifier_str_mv GPS Solutions, v. 26, n. 2, 2022.
1521-1886
1080-5370
10.1007/s10291-022-01228-0
2-s2.0-85123642657
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv GPS Solutions
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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