Resolução espacial da Grade Ionosférica e do Give

Aguiar, Claudinei Rodrigues de; Camargo, Paulo de Oliveira

doi:10.1590/s1982-21702012000300007

Cited by 3 publications

(2 citation statements)

References 5 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The topic of the modeling and estimation of the Regional Ionosphere Maps has been the target of investigations by the international and national scientific community in the last years (Camargo 1999;Opperman et al 2007;Brunini et al 2008;Zahra, Michael and Dave 2010;Aguiar and Camargo 2012;Aa et al 2015;Zhao, Mekik and Feng 2016). To estimate the RIM, the data from a denser GNSS network for the region is used, which allows the production of ionosphere maps with better spatial and temporal resolutions than the GIM.…”

Section: Characteristics Of Regional and Global Ionosphere Mapsmentioning

confidence: 99%

Assessing the Quality of the Near Real-Time Regional Vtec Maps Produced by La Plata University in Absolute GNSS Positioning Over Brazil

2021

View full text Add to dashboard Cite

started providing near real-time Regional Ionosphere Maps (MAGN) with high spatial and temporal resolutions and low latency. In this paper, we show a performance evaluation of these new ionosphere maps in space of positioning during the first year (2019) of available data. The assessment was carried out through absolute GNSS positioning using the in-house RT-PPP software. Data from five stations in Brazil, distributed in different geomagnetic latitudes, were processed. The performance of the MAGN was evaluated comparing the coordinates estimated using MAGN maps and the Global Ionosphere Maps (GIM) from CODE, both concerning the PPP ionosphere-free combination solution. Although it has been found that, in general, the MAGN and CODE solutions are compatible, the former provided better positioning result (8.5%) in the altimetric (up) component. However, when an atypical behavior in the MAGN solution at the end of the year 2019 as well as days of incomplete maps were removed from the analysis, the solution with MAGN becomes slightly better than CODE, providing an improvement of 8.6% in the up component.

show abstract

Section: Characteristics Of Regional and Global Ionosphere Mapsmentioning

confidence: 99%

Assessing the Quality of the Near Real-Time Regional Vtec Maps Produced by La Plata University in Absolute GNSS Positioning Over Brazil

2021

View full text Add to dashboard Cite

show abstract

“…Despite the relevance of better understanding the physical processes of the electron density distributions, the ionosphere still remains as a significant obstacle to the accuracy of the Global Navigation Satellite Systems (GNSS) positioning in the single-frequency Precise Point Positioning (PPP). The ionospheric models developed to improve the GNSS positioning in the Brazilian longitudinal sector, the region analyzed in this work, were based on two-dimensional representations of the Vertical Total Electron Content (VTEC) (Camargo et al, 2000;Aguiar and Camargo, 2012;Machado and Fonseca Jr, 2013). However, unavoidable errors degrade the GNSS positioning using these models due to the approximation of the ionosphere as a thin shell with constant height.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Ionospheric Tomography and Its Assessment by Ionosonde Electron Density, GPS TEC, and Single-Frequency PPP

Prol

Camargo

Hernández‐Pajares

et al. 2019

IEEE Trans. Geosci. Remote Sensing

View full text Add to dashboard Cite

A new tomographic method was developed with the main goal of mapping the ionosphere in the Brazilian region. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the lack of data of climatological models in low-latitude regions. A new way of performing iterations of the conventional Multiplicative Algebraic Reconstruction Technique (MART) was also used in order to avoid non-illuminated cells and improve the spatial resolution. The quality assessment using independent ionosonde data during two weeks during 2013 showed a better performance of the proposed method in comparison to the International Reference Ionosphere, providing an improvement of 31% for the F-layer peak height and 24% for the ionospheric peak of electron density . The tomographic technique was also evaluated in the estimation of the Total Electron Content (TEC) and in the single-frequency Precise Point Positioning (PPP).An improvement of 59% in TEC and 31% in the single-frequency PPP was obtained in comparison to the results derived from Global Ionospheric Maps. In addition, a better daily description of the ionosphere was obtained with the proposed method, where it was possible

show abstract

Estimativa da tendência diferencial do código nos receptores GNSS

Prol

Camargo

2014

Bol. Ciênc. Geod.

Self Cite

View full text Add to dashboard Cite

RESUMOA tendência diferencial devido ao atraso do código (DCB) dos satélites e receptores é um dos parâmetros estimados, juntamente com o conteúdo total de elétrons (TEC), nos modelos ionosféricos que utilizam dados do GNSS. O IGS disponibiliza arquivos em formato IONEX que fornecem os valores dos DCB's dos satélites e receptores utilizados na modelagem do TEC a partir de uma rede GNSS global. Visando calcular o DCB para qualquer estação receptora, pertencente ou não a rede utilizada pelos centros de análise do IGS, este trabalho apresenta uma técnica de estimativa do DCB do receptor baseada em arquivos IONEX. O método estima o DCB do receptor a partir da média aritmética da combinação linear livre da geometria. O processamento é realizado com menos esforço computacional ao utilizado na modelagem ionosférica, pois não é necessário realizar a modelagem do TEC. Os DCB's estimados apresentaram concordância de 0,47 ns com os DCB's disponibilizados nos arquivos IONEX do CODE em estações pertencentes à região brasileira. Palavras-chave: DCB; TEC; IONEX. ABSTRACTThe differential code bias (DCB) is one estimated parameter in ionospheric models using data from GNSS. DCB's values from satellites or receivers can be obtained

show abstract

Resolução espacial da Grade Ionosférica e do Give

Cited by 3 publications

References 5 publications

Assessing the Quality of the Near Real-Time Regional Vtec Maps Produced by La Plata University in Absolute GNSS Positioning Over Brazil

Assessing the Quality of the Near Real-Time Regional Vtec Maps Produced by La Plata University in Absolute GNSS Positioning Over Brazil

A New Method for Ionospheric Tomography and Its Assessment by Ionosonde Electron Density, GPS TEC, and Single-Frequency PPP

Estimativa da tendência diferencial do código nos receptores GNSS

Contact Info

Product

Resources

About