SYNTHESIS AND ANALYSIS OF THE PHASE SYNCHRONIZATION SYSTEM UNDER THE REDUCTION OF PERMANENT DYNAMIC ERRORS IN THE CARRIER FREQUENCY TRACKING MODE

The successful solution of the problem of further improving the efficiency of communication systems largely depends on the quality of operation of systems and devices that are part of them. Phase synchronization systems are widely implemented in various radio engineering devices of communication, radar and control technology, as well as in the device of precise magnetic recording. In particular, in phase-coherent telecommunications and control systems, they are used to restore the carrier and clock frequencies and for coherent demodulation of analog and digital signals with angular modulation. The issues of increasing the efficiency of the phase synchronization system of phase-coherent telecommunication and control systems in radio engineering devices are considered in the work. Namely, the results of synthesis and analysis of the scheme of construction of the combined system of phase synchronization under the condition of reduction of constant dynamic errors during monitoring of the carrier frequency, the phase of which is modulated by a deterministic Doppler signal are presented. As a result of research it is established that the synthesis of the open channel in the combined synchronization systems allows to realize them on invariant schemes which provide reduction of constant dynamic errors by increase of the order of astatism. The use as an open communication frequency discriminator, allows to increase the order of astatism of the combined system synchronization system to the second order. The open channel is made in the form of parallel (serial) connection 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. The analysis of the proposed schemes showed that the effect on the phase error dispersion of the synchronization system can be achieved by changing the parameters of the broken link of the scheme of construction of the specified system.

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

Telecommunication and information technologies ◽

10.31673/2412-4338.2020.024434 ◽

2020 ◽

Vol 69 (2) ◽

Author(s):

O. L. Turovsʹkyy ◽

Keyword(s):

Communication Technology ◽

Carrier Frequency ◽

Communication Systems ◽

Open Channel ◽

Phase Synchronization ◽

Combined System ◽

Open Communication ◽

Radio Engineering ◽

Frequency Discriminator ◽

And Control

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.

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