Evaluation of the GNSS positioning performance under influence of the ionospheric scintillation



Título del documento: Evaluation of the GNSS positioning performance under influence of the ionospheric scintillation
Revista: Boletim de ciencias geodesicas
Base de datos: PERIÓDICA
Número de sistema: 000458659
ISSN: 1413-4853
Autores: 1
1
2
3
4
Instituciones: 1Universidade Federal Rural da Amazonia, Instituto Ciberespacial, Belem, Para. Brasil
2Universidade Federal Rural da Amazonia, Curso de Engenharia Cartografica e de Agrimensura, Belem, Para. Brasil
3Universidade Estadual Paulista "Julio de Mesquita Filho", Departamento de Cartografia, Presidente Prudente, Sao Paulo. Brasil
4Universidade Tecnologica Federal do Parana, Apucarana, Parana. Brasil
Año:
Volumen: 26
Número: 3
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés The ionosphere may not only degrade the accuracy of the GNSS positioning but also reduce its availability because there is a high dependence between signal losses and ionospheric irregularities. Irregularities in the Earth’s ionosphere may produce rapid fluctuations in phase and amplitude. These rapid fluctuations are called ionospheric scintillation. Thus, loss of signal can occur due to the effects of diffraction and refraction, which cause a weakening in the signal received by the GNSS receivers. In this way, this paper aims to evaluate the magnitude of ionospheric scintillation in Brazil and the performance of the positioning under its influence in the period of high solar activity in the current cycle (24), through the Spearman correlation analysis and the Wavelet periodogram. For that, three-year time series (2012 to 2014) of the S4 index and 3D MSE (Mean Squared Error) of three Brazilian stations with different ionospheric conditions were considered, PALM (near the Geomagnetic Equator) PRU2 (Equatorial region and Anomalies) and POAL (Mid-latitude region). Thus, it was possible to evaluate the correlation between the accuracy of the precise point positioning using only the C/A code of the GPS satellite and the S4 index. As a result, there was a correlation of 53% and 51%, using the Spearman method, for the PALM and PRU2 series, respectively. In addition, considering the analysis of space-frequency in relation to time by the Wavelet coherence method, a correlation of more than 70% is noted in the period of greatest 3D MSE concerning the spring and autumn equinox months
Disciplinas: Geociencias
Palabras clave: Ciencias de la atmósfera,
Ionósfera,
Correlación,
Coherencia de ondas,
Indice S4
Keyword: Atmospheric sciences,
Ionospheric effects,
Correlation,
Wavelet coherence,
S4 Index
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