МОДЕЛЬ СИСТЕМИ ВИЗНАЧЕННЯ ВИДУ ФАЗОВОЇ МАНІПУЛЯЦІЇ ТА СИМВОЛЬНОЇ ШВИДКОСТІ В РАДІОЛІНЯХ КОСМІЧНИХ СИСТЕМ

Abstract

The article proposes a model of a universal automated system for determining the type of phase manipulation and symbol rate for receiving the flow of data by ground-based means transmitted in the radio lines of low-orbit space systems under a partial prior uncertainty. The relevance of the study on the selected topic is that in the last decade there has been noted a significant increase in the number of space systems operating in low-Earth orbits. The afore-mentioned fact leads to an increase in the variety of radio line structures of space systems, which creates a partial prior uncertainty in relation to the parameters of radio signals transmitted by these systems. At the same time, the operation of space systems in low-Earth orbits imposes restrictions on the duration of the communication session, which makes it difficult to set up the ground-based demodulating equipment under conditions of a partial prior uncertainty of the radio signal parameters. Considering the above, the article presents a possible option for designing a structure chart of a universal automated system for determining the type of phase manipulation and symbol rate. The principle of system operation is described and its operability is substantiated by mathematical modelling processes. The considered model of the universal automated system for determining the type of phase manipulation and symbol rate enables to determine the nominal value of the central carrier frequency of the radio signal, radio spectrum width, symbol rate and one of three types of phase manipulation (BPSK, QPSK, 8PSK) in the time operation mode close to real one. By the results of calculations being made, it is established that the system under study can be used while receiving data from space systems operating in low-Earth orbits. Also, the proposed system can be applied to determine the basic parameters of radio signals and other systems that use radio lines with phase manipulation. Further research on the selected topic will be aimed at studying the possibility of expanding the number of types of manipulations that can be automatically determined by the proposed system.