Abstract
Currently, local differential subsystems (LDPS) of GNSS GLONASS/GPS operating in the MF frequency range are deployed on the inland waterways of Russia. The paper deals with the problems of creating a continuous field of differential correction associated with the significant influence of the underlying surface on the distance of radio waves propagation in this range. It presents a method of constructing the optimal automatic system of dissemination of differential correction. The method is based on a technique developed by the authors for calculating the range of LDPS stations. The technique allows determining the range of stations by the criterion of a permissible error probability of the symbol-by-symbol message reception for different conditions (sea, land areas with different electrical properties). An algorithm for constructing an optimal differential system is developed. The results of comparison with the analytical solution and experimental data are presented. The deviation of the calculated data from the experimental data at a distance of 200 km does not exceed 5%, which is perfectly acceptable for this case. An example of the construction of the optimal LDPS structure for the Yenisey basin is given.
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