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We present a brief description and comparative analysis of the Klobuchar, GEMTEC, and NTCM GL models of total electron content in the ionosphere. The quality of model performance against experimental data on the total electron content is compared. Statistical estimates for the residual positioning error are obtained for each of these models on the basis of the international Global Navigation Satellite Sys tems (GNSS) Service data. The GEMTEC and NTCM GL models are shown to have a higher positioning accuracy than the Klobuchar model. The best results of the ionospheric error correction are provided by the GEMTEC model.

A renewed version of the model of the total electron content in the ionosphere, GEMTEC, is pre sented, aimed at an increase in the accuracy of positioning of single frequency equipment of satellite radio navigation systems. The results of testing of this model in comparison with the standard method of compen sation of the ionospheric delay of radio signals using the Klobuchar model are presented. It is shown that the proposed model is much more accurate than the Klobuchar model.

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