Invariant approach to reduction of transient component phase error of synchronization system in carrier frequency tracking mode

Abstract

The article deals with phase synchronization systems of radio technical devices of communication technology. Namely, the results of theoretical research in the direction of development, analysis and improvement of known and synthesis of new synchronization schemes, which are characterized by high interference resistance, accuracy and speed with a simple design, are presented. In the article: the possibility of using an invariant approach for the synthesis of a combined system of phase synchronization of a coherent demodulator under the condition of ensuring high-speed operation, increasing the accuracy and stability of the system in stable and transient modes of tracking the carrier frequency is considered. Analytical relations were obtained and a model was developed that, based on the invariant approach, allows determining the type and parameters of the open connection in the combined synchronization system under the condition of increasing the order of the astatism of the system to the required value, which ensures a decrease in the values of constant dynamic errors of the system and increases the stability and dynamism of the system in various input signal reception modes. The obtained results justified the following conclusions. The introduction of a combined system of synchronization of physically realized links into an open channel ensures the invariance property of the system with a higher order of astatism. The use of a frequency discriminator as an open connection allows you 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) inclusion of two links of the frequency discriminator with the transfer function proposed in the work allows to increase the order of astatism to the third order and higher and does not affect the stability of the system in stable and transient modes of carrier tracking. Frequency.