Increasing the order of astatism of phase synchronization systems in carrier frequency tracking mode in satellite communication systems

DOI:10.31673/2412-4338.2020.024434

Abstract

Successful solution to the problem of further improving the efficiency of communication systems largely depends on the quality of functioning of the systems and devices that are part of them. Phase synchronization systems are widely implemented in various radio engineering devices of communication technology, radar and control, as well as in the device of exact magnetic recording. In particular, in phase-coherent telecommunication and control systems, they are used for carrier and clock frequency recovery and for coherent demodulation of analog and digital signals with angular modulation
In the article the systems of phase synchronization of radio engineering devices of communication technology are considered. In particular, the results of theoretical researches in the direction of development, analysis and improvement of known and synthesis of new synchronization circuits, characterized by high noise immunity, accuracy and speed with simplicity of design, are presented.
In the article: the proposed model of the combined system of disconnection is broken; the problem of synthesis of open communication in the combined system of synchronization is solved with the condition of increasing the order of astatism at tracking the carrier frequency (pilot - signal), the phase of which is modulated by a deterministic Doppler signal; Analytical ratios and on their basis are offered a method that allows to determine the type and parameters of open communication in the combined system of synchronization, provided that the order of astatism of the system is increased to the required value.
The obtained results substantiated the following conclusions. Introduction to the open channel of the combined system of synchronization of physically realized units, allows to increase the order of astatism of the system and to synthesize invariant systems. The use of a frequency discriminator as an open link allows to increase the order of astatism of the combined system of synchronization of the system to the second order. The open channel is made in the form of parallel (sequential) inclusion of two links of the frequency discriminator with the proposed transfer function allows to increase the order of astatism to the third and higher order and does not affect the stability of the system.

Keywords: carrier frequency synchronization, closed-loop synchronization, combined synchronization system, disconnect synthesis, astatism order.

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