scholarly journals Model of phase synchronization system operating under conditions of violent ionospheric disturbances

2020 ◽  
Vol 873 ◽  
pp. 012014
Author(s):  
V A Tsimbal ◽  
S N Shimanov ◽  
D V Mokrinskiy ◽  
V E Toiskin
Keyword(s):  
Phase Synchronization ◽  
Ionospheric Disturbances ◽  
Synchronization System ◽  
System Operating

Phase synchronization system receiver module for the mid-frequency Square Kilometre Array

2020 ◽  
Vol 6 (04) ◽  
Author(s):  
Skevos F. E. Karpathakis ◽  
Charles T. Gravestock ◽  
David R. Gozzard ◽  
Thea R. Pulbrook ◽  
Sascha. W. Schediwy
Keyword(s):  
Phase Synchronization ◽  
Synchronization System ◽  
Square Kilometre Array ◽  
Receiver Module

scholarly journals The Phenomenon of Bistable Phase Difference Intervals in the Times-Frequency Vibration Synchronization System Driven by Two Homodromy Exciters

2020 ◽  
Vol 2020 ◽  
pp. 1-24
Author(s):  
Lingxuan Li ◽  
Xiaozhe Chen
Keyword(s):  
Phase Difference ◽  
Rotational Speed ◽  
Phase Synchronization ◽  
Perturbation Parameter ◽  
Vibration System ◽  
Synchronization System ◽  
Motion Trajectories ◽  
Frequency Capture ◽  
Perturbation Parameters ◽  
The Times

A vibration system with two homodromy exciters operated in different rotational speed is established to investigate whether the phenomenon of bistable phase difference intervals exists in the times-frequency vibration synchronization system. Some constructive conclusions are proposed. (1) By introducing an average angular velocity perturbation parameter ε0 and two sets of phase difference perturbation parameters and ε2, the frequency capture criterion and the necessary criteria for realizing the times-frequency vibration synchronization are derived. The corresponding stability analysis is carried out. (2) By the theoretical analysis and experiments, it is verified that the times-frequency vibration synchronization system exists the phenomena of bistable phase difference interval. That is, the phase differences between the two homodromy exciters are stable around 180 degrees when they are located at a short distance; the antiphase synchronization phenomenon appears. On the contrary, they are stable around 0 degrees at the in-phase synchronization state. (3) Because of the two homodromy exciters operating in the different rotational speed, the vibration system obtains relatively complex compound motion trajectories; the corresponding application is investigated by adding a feeding material chamber. The times-frequency vibration synchronization system can be used to design the vibration mill for reducing its low-energy zone and developing chaotic mixing equipment for obtaining a better mixing effect.

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

2020 ◽  
pp. 90-99
Author(s):  
O. L. Turovsky ◽  
O. A. Khakhlyuk
Keyword(s):  
Control Systems ◽  
Carrier Frequency ◽  
Open Channel ◽  
Phase Synchronization ◽  
Combined System ◽  
Synchronization System ◽  
Radio Engineering ◽  
Frequency Discriminator ◽  
Dynamic Errors ◽  
And Control

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.

EFFECT OF PHASE INSTABILITY OF GENERATORS ON THE OPERATING PARAMETERS OF A CARRIER FREQUENCY SYNCHRONIZATION SYSTEM AGAINST A BACKGROUND OF ADDITIVE GAUSSIAN NOISE AND A DOPPLER FREQUENCY SHIFT

2020 ◽  
pp. 62-71
Author(s):  
O.L. Turovsky ◽  
L.A. Kirpach
Keyword(s):  
Closed Loop ◽  
Phase Synchronization ◽  
Phase Error ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Open Communication ◽  
Phase Instability ◽  
Synchronization System ◽  
Closed Type ◽  
Optimal Value

The article deals with the systems of phase synchronization of radio engineering devices of communication technology. The purpose of the article is theoretical research in the direction of development, analysis and improvement of known and synthesis of new phase synchronization circuits, characterized by high noise immunity, accuracy and speed with simplicity of design. The problem is solved to investigate the possibilities of closed and combined synchronization systems for operation under conditions of phase instability of generators in a communication channel against the background of external additive Gaussian noise and Doppler frequency shift. The following results were obtained. The analysis of closed-type synchronization systems during operation under the conditions of phase instability of generators is carried out and its inconsistency is shown in order to minimize the phase error variance and increase the dynamics during carrier frequency monitoring. The process of synthesis of open communication in the combined synchronization system is refined and analytical dependences are offered, which allow to refine the technique of synthesis of open communication for the combined synchronization system with regard to the phase instability of the generators against the background of the influence of the adducts. Conclusions. Increasing the noise bandwidth of the proportional-integrating filter of the closed-loop phase-in-phase synchronization system to the parameters of the ideal filter impairs the dynamics of the specified system. For the combined synchronization system, in the conditions of phase instability of the generators, an increase in the noise bandwidth of the input signal can be achieved by applying a closed-loop proportional-integrating filter and by making appropriate selection of parameters of the transfer function of the link of the open channel. In the conditions of phase instability of the generators in the combined system of synchronization by selecting the parameters of the proportional-integrating filter, it is possible to provide the necessary dynamics of the system and to achieve the optimal value of the dispersion of the phase error in it. Taking into account Doppler noise under conditions of phase instability of generators for a closed-type synchronization system and a combined synchronization system requires a reduction of the optimal value of the noise bandwidth.

The scientific bases of autocontrol with vibration phase for a resonance beating-vibration system with two degrees of freedom driven by debalances

1996 ◽  
Vol 18 (2) ◽  
pp. 43-48
Author(s):  
Tran Van Tuan ◽  
Do Sanh ◽  
Luu Duc Thach
Keyword(s):  
Degrees Of Freedom ◽  
Regulation System ◽  
Vibration System ◽  
Two Degrees Of Freedom ◽  
System Operating

In the paper it is introduced a method for studying dynamics of beating-vibrators by means of digital calculation with the help of the machine in accordance with the needs by the helps of an available auto regulation system operating with high reability.

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