IONEX Real Time TEC Maps from GIB (Brazilian Ionospheric Grid)
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Abstract
Currently, ionosphere layer’s interference on the L-band signals broadcasted by GNSS (Global Navigation Satellite System) satellites is the largest error source on positioning using this system. Free electrons in ionosphere layer affect GNSS signals during its propagation between the satellite and receiver antennas. These electrons cause changes in the
amplitude, phase and propagation velocity of the signals. Thus, the magnitude of the systematic error due to ionospheric
effects is directly proportional to the TEC (Total Electron Contents) in the transionospheric signal path and inversely
proportional to the square of the signal frequency. On the other hand, the active GNSS networks, such as RBMC, have
become important framework of sensors for ionosphere and space weather monitoring. To fix the ionospheric effects on
the signs and for ionosphere monitoring in real time, in Brazil has been developed both model and an algorithm for the
real time GNSS data assimilation and generate ionospheric grid and its corresponding confidence level (GIVE – Grid
Ionospheric Vertical Error). This algorithm, called GIB (Brazilian Ionospheric Grid) also estimates and corrects the
satellite and receiver interfrequency biases to estimate the absolute TEC values. This paper presents the results obtained
with the GIB and the ionospheric maps generated in near real time in IONEX (IONosphere map EXchange) format.
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