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

Phase Synchronization for the Mid-Frequency Square Kilometre Array Telescope

2018 ◽  
Author(s):  
Sascha. W. Schediwy ◽  
David R. Gozzard ◽  
Simon Stobie ◽  
Charles Gravestock ◽  
Thea Pulbrook ◽  
...  
Keyword(s):  
Phase Synchronization ◽  
Square Kilometre Array

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.

Studying noise immunity of radio information transmission systems with noise-like phase-shift keyed signals and synchronization delay errors

2019 ◽  
pp. 105-113
Author(s):  
G. N. Maltsev ◽  
A. V. Evteev
Keyword(s):  
Phase Shift ◽  
Information Transmission ◽  
Noise Immunity ◽  
Tracking System ◽  
Tracking Error ◽  
Information Symbol ◽  
Transmission Systems ◽  
Synchronization System ◽  
Correlation Receiver ◽  
Selection Of

Introduction: Radio information transmission systems with noise-like phase-shift keyed signals based on pseudo-random sequences have potential noise immunity provided by accurately tracking the delay of the received signal in the correlation receiver. When working with moving objects, the delay of the received signal varies continuously, and the reception quality for noise-like phase-shifted signals highly depends on the synchronization system operation and on the accuracy of estimating the received signal delay by the tracking system. To ensure the required signal reception quality, it is necessary to provide an informed choice of tracking system parameters, taking into account their effects, which are the random and systematic components of the delay tracking error, on the selected noise immunity indicator.Purpose: Analyzing how the errors in tracking the delay of a received phase-shift keyed signal based on a pseudorandom sequence by the synchronization system of a radio information transmission system can affect the probability of erroneous reception of an information symbol.Results: The calculation method was used to obtain families of dependencies of the probability of erroneous reception of an information symbol on the signal-noise ratio (SNR), and the values of the random and systematic components of the delay tracking error which are normalized to the capture band of the correlation receiver. It has been shown that at a fixed SNR, the values of the random and systematic components of the delay tracking error are critical for the erroneous reception probability. In all the cases discussed, all the dependencies are characterized by a slow change of the erroneous reception probability while the synchronization errors within the area of small SNR have fixed values. As the SNR value grows, the erroneous reception probability rapidly drops. To ensure the specified signal reception quality and the reliability of the selection of information symbols and messages in a radio information transmission system with noise-like phase-manipulated signals, its synchronization system requires a joint selection of the tracking system parameters, taking into account the limitations imposed by the operating conditions and technical implementation features.Practical relevance: The obtained results can be used in noise immunity analysis of radio information transmission systems with noise-like phase-shift keyed signals in a wide range of communication conditions, and in providing technical solutions for synchronization systems ensuring the required quality of signal reception.

Sign in / Sign up

Export Citation Format

Share Document