Компенсация искажений сигналов при распространении по трансионосферным радиолиниям с использованием глобальной модели земной ионосферы

Abstract

A description is given of distortions of complex envelopes of digital signals during their propagation along transionospheric channels, the effect of which is equivalent to linear filtering. It is shown that signal distortions due to the dispersion properties of the earth's ionosphere cause the occurrence of interference noise which reduces the reliability of information transmission. It is noted that the effect of digital signal processing methods at reception, which reduce the distorting effect of interference is to form a linear filter with an inverse transmission coefficient relative to the transionospheric channels. A method for forming the inverse filter using the global model of the earth's ionosphere Klobuchar, developed and intensively used in the GPS satellite navigation system to improve the accuracy of navigation measurements is considered. A detailed description of this method is given, which is based on estimating the total electron content of a transionospheric channels using the considered Klobuchar model. Limitations in the application of the method under consideration are determined.