Using a regional numerical weather prediction model for GNSS positioning over Brazil
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s10291-015-0477-x http://hdl.handle.net/11449/167946 |
Resumo: | The global navigation satellite system (GNSS) can provide centimeter positioning accuracy at low costs. However, in order to obtain the desired high accuracy, it is necessary to use high-quality atmospheric models. We focus on the troposphere, which is an important topic of research in Brazil where the tropospheric characteristics are unique, both spatially and temporally. There are dry regions, which lie mainly in the central part of the country. However, the most interesting area for the investigation of tropospheric models is the wet region which is located in the Amazon forest. This region substantially affects the variability of humidity over other regions of Brazil. It provides a large quantity of water vapor through the humidity convergence zone, especially for the southeast region. The interconnection and large fluxes of water vapor can generate serious deficiencies in tropospheric modeling. The CPTEC/INPE (Center for Weather Forecasting and Climate Studies/Brazilian Institute for Space Research) has been providing since July 2012 a numerical weather prediction (NWP) model for South America, known as Eta. It has yield excellent results in weather prediction but has not been used in GNSS positioning. This NWP model was evaluated in precise point positioning (PPP) and network-based positioning. Concerning PPP, the best positioning results were obtained for the station SAGA, located in Amazon region. Using the NWP model, the 3D RMS are less than 10 cm for all 24 h of data, whereas the values reach approximately 60 cm for the Hopfield model. For network-based positioning, the best results were obtained mainly when the tropospheric characteristics are critical, in which case an improvement of up to 7.2 % was obtained in 3D RMS using NWP models. |
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Using a regional numerical weather prediction model for GNSS positioning over BrazilGNSSNumerical weather predictionPositioningZenithal tropospheric delayThe global navigation satellite system (GNSS) can provide centimeter positioning accuracy at low costs. However, in order to obtain the desired high accuracy, it is necessary to use high-quality atmospheric models. We focus on the troposphere, which is an important topic of research in Brazil where the tropospheric characteristics are unique, both spatially and temporally. There are dry regions, which lie mainly in the central part of the country. However, the most interesting area for the investigation of tropospheric models is the wet region which is located in the Amazon forest. This region substantially affects the variability of humidity over other regions of Brazil. It provides a large quantity of water vapor through the humidity convergence zone, especially for the southeast region. The interconnection and large fluxes of water vapor can generate serious deficiencies in tropospheric modeling. The CPTEC/INPE (Center for Weather Forecasting and Climate Studies/Brazilian Institute for Space Research) has been providing since July 2012 a numerical weather prediction (NWP) model for South America, known as Eta. It has yield excellent results in weather prediction but has not been used in GNSS positioning. This NWP model was evaluated in precise point positioning (PPP) and network-based positioning. Concerning PPP, the best positioning results were obtained for the station SAGA, located in Amazon region. Using the NWP model, the 3D RMS are less than 10 cm for all 24 h of data, whereas the values reach approximately 60 cm for the Hopfield model. For network-based positioning, the best results were obtained mainly when the tropospheric characteristics are critical, in which case an improvement of up to 7.2 % was obtained in 3D RMS using NWP models.São Paulo State University - UNESP - Brazil, Roberto Simonsen, 305INPE - Instituto Nacional de Pesquisas Espaciais, Rodovia Presidente Dutra, km 40UFPE - Universidade Federal de Pernambuco - Brazil, Rua Academico Hélio Ramos, S/N, Cidade UniversitáriaMaringa State University - UEM - Brazil, Colombo Av., 5790São Paulo State University - UNESP - Brazil, Roberto Simonsen, 305Universidade Estadual Paulista (Unesp)INPE - Instituto Nacional de Pesquisas EspaciaisUniversidade Federal de Pernambuco (UFPE)Universidade Estadual de Maringá (UEM)Alves, Daniele Barroca Marra [UNESP]Sapucci, Luiz FernandoMarques, Haroldo Antoniode Souza, Eniuce MenezesGouveia, Tayná Aparecida Ferreira [UNESP]Magário, Jackes Akira [UNESP]2018-12-11T16:38:59Z2018-12-11T16:38:59Z2016-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article677-685application/pdfhttp://dx.doi.org/10.1007/s10291-015-0477-xGPS Solutions, v. 20, n. 4, p. 677-685, 2016.1521-18861080-5370http://hdl.handle.net/11449/16794610.1007/s10291-015-0477-x2-s2.0-849387179942-s2.0-84938717994.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGPS Solutions1,674info:eu-repo/semantics/openAccess2023-12-03T06:14:37Zoai:repositorio.unesp.br:11449/167946Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:23:42.171040Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
title |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
spellingShingle |
Using a regional numerical weather prediction model for GNSS positioning over Brazil Alves, Daniele Barroca Marra [UNESP] GNSS Numerical weather prediction Positioning Zenithal tropospheric delay |
title_short |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
title_full |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
title_fullStr |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
title_full_unstemmed |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
title_sort |
Using a regional numerical weather prediction model for GNSS positioning over Brazil |
author |
Alves, Daniele Barroca Marra [UNESP] |
author_facet |
Alves, Daniele Barroca Marra [UNESP] Sapucci, Luiz Fernando Marques, Haroldo Antonio de Souza, Eniuce Menezes Gouveia, Tayná Aparecida Ferreira [UNESP] Magário, Jackes Akira [UNESP] |
author_role |
author |
author2 |
Sapucci, Luiz Fernando Marques, Haroldo Antonio de Souza, Eniuce Menezes Gouveia, Tayná Aparecida Ferreira [UNESP] Magário, Jackes Akira [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) INPE - Instituto Nacional de Pesquisas Espaciais Universidade Federal de Pernambuco (UFPE) Universidade Estadual de Maringá (UEM) |
dc.contributor.author.fl_str_mv |
Alves, Daniele Barroca Marra [UNESP] Sapucci, Luiz Fernando Marques, Haroldo Antonio de Souza, Eniuce Menezes Gouveia, Tayná Aparecida Ferreira [UNESP] Magário, Jackes Akira [UNESP] |
dc.subject.por.fl_str_mv |
GNSS Numerical weather prediction Positioning Zenithal tropospheric delay |
topic |
GNSS Numerical weather prediction Positioning Zenithal tropospheric delay |
description |
The global navigation satellite system (GNSS) can provide centimeter positioning accuracy at low costs. However, in order to obtain the desired high accuracy, it is necessary to use high-quality atmospheric models. We focus on the troposphere, which is an important topic of research in Brazil where the tropospheric characteristics are unique, both spatially and temporally. There are dry regions, which lie mainly in the central part of the country. However, the most interesting area for the investigation of tropospheric models is the wet region which is located in the Amazon forest. This region substantially affects the variability of humidity over other regions of Brazil. It provides a large quantity of water vapor through the humidity convergence zone, especially for the southeast region. The interconnection and large fluxes of water vapor can generate serious deficiencies in tropospheric modeling. The CPTEC/INPE (Center for Weather Forecasting and Climate Studies/Brazilian Institute for Space Research) has been providing since July 2012 a numerical weather prediction (NWP) model for South America, known as Eta. It has yield excellent results in weather prediction but has not been used in GNSS positioning. This NWP model was evaluated in precise point positioning (PPP) and network-based positioning. Concerning PPP, the best positioning results were obtained for the station SAGA, located in Amazon region. Using the NWP model, the 3D RMS are less than 10 cm for all 24 h of data, whereas the values reach approximately 60 cm for the Hopfield model. For network-based positioning, the best results were obtained mainly when the tropospheric characteristics are critical, in which case an improvement of up to 7.2 % was obtained in 3D RMS using NWP models. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-10-01 2018-12-11T16:38:59Z 2018-12-11T16:38:59Z |
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/s10291-015-0477-x GPS Solutions, v. 20, n. 4, p. 677-685, 2016. 1521-1886 1080-5370 http://hdl.handle.net/11449/167946 10.1007/s10291-015-0477-x 2-s2.0-84938717994 2-s2.0-84938717994.pdf |
url |
http://dx.doi.org/10.1007/s10291-015-0477-x http://hdl.handle.net/11449/167946 |
identifier_str_mv |
GPS Solutions, v. 20, n. 4, p. 677-685, 2016. 1521-1886 1080-5370 10.1007/s10291-015-0477-x 2-s2.0-84938717994 2-s2.0-84938717994.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
GPS Solutions 1,674 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
677-685 application/pdf |
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 |
|
_version_ |
1808129062347997184 |