Variability of Vertical Total Electron Content Gradients in the Brazilian Sector

dc.contributor.authorEspejo, Teddy Modesto Surco
dc.contributor.authorCosta, Emanoel
dc.contributor.authorde Paula, Eurico Rodrigues
dc.contributor.authorMoraes, Alison de Oliveira
dc.contributor.authorMonico, Joao Francisco Galera
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.abstractGround Based Augmentation Systems are designed to meet demanding requirements during airport approach and landing sections of aircraft routes. It computes corrected and smoothed differential corrections and other information. These messages are transmitted to aircraft, which may use the corrections to improve their position estimation. However, residual correction errors remain, due to ionospheric spatial and temporal gradients between Ground Based Augmentation System reference receivers and approaching aircrafts. Large vertical ionospheric delay gradients detected during combinations of extreme geophysical environments indicate that there are problematic conditions for Ground Based Augmentation System operation over the Brazilian region. Motivated by the above conditions, data from Rede Brasileira de Monitoramento Contínuo, the Brazilian public network of dual-frequency Global Navigation Satellite System receivers operated by Instituto Brasileiro de Geografia e Estatística were analyzed to estimate ionospheric vertical Total Electron Content gradients. The effects from different locations (represented by the dip latitude) and geophysical conditions (represented by solar activity, season, and local time) on variations of ionospheric vertical Total Electron Content gradients have been statistically quantified. The results from the present work provide information to more detailed performance assessments of Ground Based Augmentation System procedures under equatorial and low-latitude ionospheric regions, aimed at flexibly delimiting the conditions for feasible operation in such regions.en
dc.description.affiliationCentro de Estudos em Telecomunicações, Pontifícia Universidade Católica do Rio de Janeiro (CETUC/PUC-Rio), Rua Marquês de São Vicente 225 Gávea, Rio de Janeiro RJ, Brazil
dc.description.affiliationInstituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas 1758, São José dos Campos, SP, Brazil
dc.description.affiliationInstituto de Aeronáutica e Espaço (IAE), Praça Mal. Eduardo Gomes 50, São José dos Campos, SP, Brazil
dc.description.affiliationUniversidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Rua Roberto Simonsen 305, Presidente Prudente, SP, Brazil
dc.identifier.citationIEEE Transactions on Aerospace and Electronic Systems.
dc.relation.ispartofIEEE Transactions on Aerospace and Electronic Systems
dc.subjectequatorial and low-latitude ionosphere
dc.subjectGlobal Positioning System
dc.subjectGround Based Augmentation Systems
dc.subjectionospheric decorrelation
dc.subjectionospheric vertical Total Electron Content gradients
dc.subjectRede Brasileira de Monitoramento Contínuo
dc.titleVariability of Vertical Total Electron Content Gradients in the Brazilian Sectoren