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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Extended ionospheric amplitude scintillation model for GPS receivers

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Autor(es):
Moraes, Alison de Oliveira [1] ; Costa, Emanoel [2] ; de Paula, Eurico Rodrigues [3] ; Perrella, Waldecir Joao [4] ; Galera Monico, Joao Francisco [5]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] IAE, Sao Paulo - Brazil
[2] Pontificia Univ Catolica Rio de Janeiro CETUC PUC, Ctr Estudos Telecomunicacoes, Rio De Janeiro - Brazil
[3] INPE, Sao Paulo - Brazil
[4] ITA, Sao Jose Dos Campos, SP - Brazil
[5] Univ Estadual Paulista Julio de Mesquita Filho UN, Sao Paulo - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: RADIO SCIENCE; v. 49, n. 5, p. 315-329, MAY 2014.
Citações Web of Science: 18
Resumo

Ionospheric scintillation is a phenomenon that occurs after sunset, especially in the low-latitude region, affecting radio signals that propagate through the ionosphere. Depending on geophysical conditions, ionospheric scintillation may cause availability and precision problems to Global Navigation Satellite System users. The present work is concerned with the development of an extended model for describing the effects of the amplitude ionospheric scintillation on GPS receivers. Using the - probabilistic model, introduced by previous authors in different contexts, the variance of GPS receiver tracking loop error may be estimated more realistically. The proposed model is developed with basis on the - parameters and also considering correlation between amplitude and phase scintillation. Its results are interpreted to explain how a receiver may experience different error values under the influence of ionospheric conditions leading to a fixed scintillation level S4. The model is applied to a large experimental data set obtained at SAo Jose dos Campos, Brazil, near the peak of the equatorial anomaly during high solar flux conditions, between December 2001 and January 2002. The results from the proposed model show that depending on the - pair, moderate scintillation (0.5S40.7) may be an issue for the receiver performance. When S4>0.7, the results indicate that the effects of scintillation are serious, leading to a reduction in the receiver availability for providing positioning solutions in approximately 50% of the cases. (AU)

Processo FAPESP: 06/04008-2 - GNSS: investigações e aplicações no posicionamento geodésico, em estudos relacionados com a atmosfera e na agricultura de precisão
Beneficiário:Joao Francisco Galera Monico
Linha de fomento: Auxílio à Pesquisa - Temático