Ionospheric parameters estimation using GLONASS/GPS data

• A new algorithm of ionospheric model adaptation according to GNSS data is offered.
• The solar 10.7 cm radio flux index is used as the adaptive parameter of the model.
• The proposed algorithm allows reducing errors of ionospheric parameters estimation.
• This algorithm is most effective during the periods of high geomagnetic activity.

In recent time, GLONASS/GPS signals are widely used for continuous monitoring of the ionospheric plasma conditions. However the ground-based GLONASS/GPS station for sounding of the ionosphere cannot provide high spatial resolution. To solve this problem, ionospheric models are used. In this article the algorithm of ionospheric model adaptation according to GLONASS/GPS data is offered. The expediency of use as the adaptive parameter values of the solar 10.7 cm radio flux index, which characterizes the level of solar activity, is shown. The adaptation parameter is defined by the minimization of the difference between the correlation matrices of the experimental and modeled TEC values. Reducing errors in the determination of ionospheric parameters in comparison with the simulation results is confirmed by experimental works in Moscow.