There is the possibility of determining the ionospheric scintillation index by a modified GPStation-6 dual-frequency receiver of GPS/GLONASS global navigation satellite systems by measuring small-scale fluctuations in the total electron content of the ionosphere and calculating their standard deviation. Based on the analysis of the shortcomings of the GPStation-6 receiver, the principle of construction and the algorithm for the functioning of the GPS monitoring complex of small-scale fluctuations of the total electronic content of the ionosphere based on their code-phase measurements and digital filtering to predict the scintillation index is substantiated. Experimental results of measurement of small-scale fluctuations of the ionosphere's total electron content and results of estimation of their root-mean-square deviation and ionospheric scintillation index are presented.
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