Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.asr.2019.05.031 http://hdl.handle.net/11449/187739 |
Resumo: | The Ambiguity Dilution of Precision (ADOP) is a well-known scalar measure that can be used to infer the strength of the Global Navigation Satellite System (GNSS) model of the carrier phase ambiguities involved in precise relative GNSS positioning. Odijk and Teunissen (2008a) derived closed-form expressions for single-baseline GNSS models that allow verifying the factors affecting the ambiguity resolution as well as the probability of its correct resolution as integer values. However, this weighted-ionosphere ADOP closed form assumes that the standard deviation of the ionosphere delay is dependent on a function associated with the baseline length. This means that a baseline of the same length at different locations around the world and in different moments in time would have the same standard deviation, which in practice is not true. This becomes even worse in regions like Brazil, where the ionospheric anomalies are more intense and frequent, especially in periods of high solar activity. In this work, a new method for calculating the ionospheric delay standard deviation that considers the ionospheric scintillation S4 index is proposed to improve the closed-form ADOP performance. Experiments with a baseline of 280 m located in Presidente Prudente, Brazil (magnetic latitude of around −13°), were carried out. The results showed that in periods of both weak and strong ionospheric scintillation, the introduction of S4 into the ionospheric delay standard deviation was beneficial for ADOP. The average improvement of the ADOP closed form was of around 72% in the analyzed period of weak scintillation and of 35% in the period of strong scintillation. In addition, the results showed that in periods of strong scintillation, relative positioning accuracy is around 100 times worse, up to 30 m, when compared to periods of weak ionospheric scintillation. |
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Ionospheric scintillation impact on ambiguity resolution using ADOP in closed formAmbiguity Dilution of PrecisionAmbiguity resolutionIonospheric scintillationReal-Time Kinematic (RTK)Relative positioningThe Ambiguity Dilution of Precision (ADOP) is a well-known scalar measure that can be used to infer the strength of the Global Navigation Satellite System (GNSS) model of the carrier phase ambiguities involved in precise relative GNSS positioning. Odijk and Teunissen (2008a) derived closed-form expressions for single-baseline GNSS models that allow verifying the factors affecting the ambiguity resolution as well as the probability of its correct resolution as integer values. However, this weighted-ionosphere ADOP closed form assumes that the standard deviation of the ionosphere delay is dependent on a function associated with the baseline length. This means that a baseline of the same length at different locations around the world and in different moments in time would have the same standard deviation, which in practice is not true. This becomes even worse in regions like Brazil, where the ionospheric anomalies are more intense and frequent, especially in periods of high solar activity. In this work, a new method for calculating the ionospheric delay standard deviation that considers the ionospheric scintillation S4 index is proposed to improve the closed-form ADOP performance. Experiments with a baseline of 280 m located in Presidente Prudente, Brazil (magnetic latitude of around −13°), were carried out. The results showed that in periods of both weak and strong ionospheric scintillation, the introduction of S4 into the ionospheric delay standard deviation was beneficial for ADOP. The average improvement of the ADOP closed form was of around 72% in the analyzed period of weak scintillation and of 35% in the period of strong scintillation. In addition, the results showed that in periods of strong scintillation, relative positioning accuracy is around 100 times worse, up to 30 m, when compared to periods of weak ionospheric scintillation.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)São Paulo State University (Unesp) School of Technology and SciencesState University of Maringa (UEM), MaringáSão Paulo State University (Unesp) School of Technology and SciencesFAPESP: 2013/06325-9FAPESP: 2016/24861-3Universidade Estadual Paulista (Unesp)Universidade Estadual de Maringá (UEM)Silva, C. M. [UNESP]Alves, D. B.M. [UNESP]Souza, E. M.Setti Junior, P. T. [UNESP]2019-10-06T15:45:46Z2019-10-06T15:45:46Z2019-08-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article921-932http://dx.doi.org/10.1016/j.asr.2019.05.031Advances in Space Research, v. 64, n. 4, p. 921-932, 2019.1879-19480273-1177http://hdl.handle.net/11449/18773910.1016/j.asr.2019.05.0312-s2.0-85067073956Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAdvances in Space Researchinfo:eu-repo/semantics/openAccess2021-10-22T18:33:21Zoai:repositorio.unesp.br:11449/187739Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T18:33:21Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
title |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
spellingShingle |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form Silva, C. M. [UNESP] Ambiguity Dilution of Precision Ambiguity resolution Ionospheric scintillation Real-Time Kinematic (RTK) Relative positioning |
title_short |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
title_full |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
title_fullStr |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
title_full_unstemmed |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
title_sort |
Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form |
author |
Silva, C. M. [UNESP] |
author_facet |
Silva, C. M. [UNESP] Alves, D. B.M. [UNESP] Souza, E. M. Setti Junior, P. T. [UNESP] |
author_role |
author |
author2 |
Alves, D. B.M. [UNESP] Souza, E. M. Setti Junior, P. T. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Estadual de Maringá (UEM) |
dc.contributor.author.fl_str_mv |
Silva, C. M. [UNESP] Alves, D. B.M. [UNESP] Souza, E. M. Setti Junior, P. T. [UNESP] |
dc.subject.por.fl_str_mv |
Ambiguity Dilution of Precision Ambiguity resolution Ionospheric scintillation Real-Time Kinematic (RTK) Relative positioning |
topic |
Ambiguity Dilution of Precision Ambiguity resolution Ionospheric scintillation Real-Time Kinematic (RTK) Relative positioning |
description |
The Ambiguity Dilution of Precision (ADOP) is a well-known scalar measure that can be used to infer the strength of the Global Navigation Satellite System (GNSS) model of the carrier phase ambiguities involved in precise relative GNSS positioning. Odijk and Teunissen (2008a) derived closed-form expressions for single-baseline GNSS models that allow verifying the factors affecting the ambiguity resolution as well as the probability of its correct resolution as integer values. However, this weighted-ionosphere ADOP closed form assumes that the standard deviation of the ionosphere delay is dependent on a function associated with the baseline length. This means that a baseline of the same length at different locations around the world and in different moments in time would have the same standard deviation, which in practice is not true. This becomes even worse in regions like Brazil, where the ionospheric anomalies are more intense and frequent, especially in periods of high solar activity. In this work, a new method for calculating the ionospheric delay standard deviation that considers the ionospheric scintillation S4 index is proposed to improve the closed-form ADOP performance. Experiments with a baseline of 280 m located in Presidente Prudente, Brazil (magnetic latitude of around −13°), were carried out. The results showed that in periods of both weak and strong ionospheric scintillation, the introduction of S4 into the ionospheric delay standard deviation was beneficial for ADOP. The average improvement of the ADOP closed form was of around 72% in the analyzed period of weak scintillation and of 35% in the period of strong scintillation. In addition, the results showed that in periods of strong scintillation, relative positioning accuracy is around 100 times worse, up to 30 m, when compared to periods of weak ionospheric scintillation. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:45:46Z 2019-10-06T15:45:46Z 2019-08-15 |
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/10.1016/j.asr.2019.05.031 Advances in Space Research, v. 64, n. 4, p. 921-932, 2019. 1879-1948 0273-1177 http://hdl.handle.net/11449/187739 10.1016/j.asr.2019.05.031 2-s2.0-85067073956 |
url |
http://dx.doi.org/10.1016/j.asr.2019.05.031 http://hdl.handle.net/11449/187739 |
identifier_str_mv |
Advances in Space Research, v. 64, n. 4, p. 921-932, 2019. 1879-1948 0273-1177 10.1016/j.asr.2019.05.031 2-s2.0-85067073956 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Advances in Space Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
921-932 |
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_ |
1799965148047212544 |