МЕТОД РАСШИРЕНИЯ ПРЕДЕЛЬНОЙ ПОЛОСЫ ЧАСТОТ ТРАНСИОНОСФЕРНОГО РАДИОКАНАЛА СИСТЕМ СПУТНИКОВОЙ СВЯЗИ В УСЛОВИЯХ ЧАСТОТНОЙ ДИСПЕРСИИ С УЧЁТОМ ЕЁ СТОХАСТИЧЕСКОЙ КОМПОНЕНТЫ
Authors: Иванов Д.В. , Кислицын А.А. , Рябова М.И. 
Published: February 2025

Решается задача расширения полосы частот трансионосферного радиоканала систем спутниковой связи в условиях частотной дисперсии. Представлен метод определения предельной полосы частот на основе полосы когерентности. Приведены аналитические выражения для вычисления случайной составляющей фазовой функции, которую в результате адаптивной коррекции не удаётся скомпенсировать. Показано, что случайная компонента появляется в результате стохастической погрешности при экспериментально измеренном полном электронном содержании ионосферы по данным глобальных навигационных спутниковых систем. Учёт различной степени ошибки позволяет получить потенциальный выигрыш в расширении полосы канала при компенсации эффекта нелинейной дисперсии в 2,5…7 раз.

Introduction. Currently, the main trends of the development of satellite communication systems are aimed at improving their information and technical characteristics. This is due to the use of a fairly wide bandwidth of the satellite channel. However, in order to significantly spread the channel bandwidth, it is necessary to solve the poorly studied problem of the influence of frequency dispersion on the communication signals during their transionospheric propagation. The aim of the research was to create a method for increasing the limiting bandwidth of the transionospheric radio channel of satellite communication systems under the influence of frequency dispersion, taking into account its stochastic component. To achieve the goal we posed the following tasks: development of a method for determining the limiting bandwidth based on the data on the coherence bandwidth of a transionospheric radio communication channel; derivation of analytical expressions for the random component of the phase function, which is not corrected by adaptive compensation; estimation of the potential gain from spreading the bandwidth of the transionospheric radio channel after adaptive compensation, taking into account the random component of the frequency dispersion, based on experimental data from global navigation satellite systems. Methods. The method for determining the limiting bandwidth of a transionospheric radio channel for the efficient operation of satellite communication systems is based on calculating the coherence bandwidth. To implement the method for determining the random component of the phase function, a complex for calculating the stochastic error of TEC measurements was developed. Findings.There was proposed a method for determining the limiting bandwidth based on the coherence bandwidth. Analytical expressions for calculating the random component of the phase function, which is not compensated by adaptive correction, were derived. It was shown that the random component appears as a result of a stochastic error of the experimental measurements of total electron content of the ionosphere with the use of the data of global navigation satellite systems. Practical significance. Taking into account different degree of error we obtained a potential gain in channel bandwidth spreading by a factor of 2.5...7 when compensating for the effect of nonlinear dispersion.