Período de mínima atividade solar: Melhora no desempenho do posicionamento relativo
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Data
2008-01-01
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In the relative positioning, even considering that part of the errors due to ionosphere is canceled with the double-difference observations, strong ionospheric effects can occur in maximum solar activity period. However, in minimum solar activity period, the ionospheric effects decrease significantly and therefore an improvement of the relative positioning perfomance takes place. In this paper we aim at showing that improvement for the scientific and GPS community users. So, have been experiments by using GPS data of two stations of the Brazilian Network for Continuous Monitoring of GPS, forming a baseline of 430 km. The processing were use accomplished with interval of two hours, and only L1 carrier data have been used. The analysis of the obtained results has been carried out from the discrepancies between the true coordinates and corresponding ones obtained in the processing. In maximum solar activity period the discrepancy value reached 25 m. On the other hand, in minimum solar activity period, the discrepancy value reached 5,5 m. It is important to emphasize that the majority of the discrepancy values didn't exceed 0,50 m, and in some cases only reached 0,10 m. This shows the increase of application possibilities of the relative positioning using single-frequency GPS receivers in minimum solar activity period.
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GPS, Ionosphere, Relative positioning, TEC
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Boletim de Ciencias Geodesicas, v. 14, n. 1, p. 35-54, 2008.