I.Y. Shkliarevskyi, E.M. Dyadenko, A.I. Shkliarevskyi
MODERN TRENDS IN THE INDUSTRIAL SPECIALIZATION OF THE PRECISION TIME PROTOCOL IEEE-1588 (pp. 3-8)
V.S. Speransky, A.P. Spirin, A.A. Frolov, T.P. Kosichkina
DEVELOPMENT PROSPECTS OF UWB COMMUNICATION IN THE DIRECTION OF COGNITIVE RADIO (pp. 9-13)
G.A. Leonov, N.V. Kuznetsov, M.V. Yuldashev, R.V. Yuldashev
NONLINEAR MATHEMATICAL MODELS OF COSTAS LOOPS (pp. 14-18)
REGULAR AND CHAOTIC SELF-MODULATION MODES OF THE GENERATOR WITH AUTOMATIC FREQUENCY CONTROL (pp. 19-23)
O.G. Antonovskaya, V.I. Goryunov
DYNAMICS QUALITAVE ANALYSIS OF FREQUENCY SYNTHESIZER WITH COMBINED CONTROL (pp. 24-28)
B.I. Shakhtarin, Y.A. Sidorkina
SIMULATION OF HYBRID SYSTEM PHASE AND CLOCK SYNCHRONIZATION WIDEBAND SIGNAL (pp. 29-34)
ABSTRACTS & REFERENCES
MODERN TRENDS IN THE INDUSTRIAL SPECIALIZATION OF THE PRECISION TIME PROTOCOL IEEE-1588
I.Y. Shkliarevskyi, firstname.lastname@example.org,
E.M. Dyadenko, A.I. Shkliarevskyi,
IST Ltd, Kiev, Ukraine
PTP or IEEE 1588-2008 protocol has extended it’s implementation in different applications for time and frequency distribution through IP-networks. The report traces some new tendencies in PTP profiles standardization by different international organizations and compared each other. Conclusions have made that the PTP profiles divergence tendency still presents now, though new tendecies appear in the opposite directions.
1. IEEE std. 1588-2008, “IEEE Standard for a Precision Clock Synchronization for Networked Measurement and Control Systems”, July, 2008.
2. Shkliarevskyi I. Precision Time Protocol in different applications: profile comparative analysis. T-Comm. 2014. No.11, pp. 116-119.
3. Arnold D., Gerstung H., “Enterprise Profile for PTP”, TICTOC Working Group Internet Draft, Feb 2015, Expires: August 4, 2015.
DEVELOPMENT PROSPECTS OF UWB COMMUNICATION IN THE DIRECTION OF COGNITIVE RADIO
V.S. Speransky, A.P. Spirin, A.A. Frolov, T.P. Kosichkina, email@example.com,
Moscow Technical University of Radio and Communications, Moscow, Russia
Currently, the popular idea of communication systems based on the reuse of the spectrum is a cognitive radio. With regard to the cognitive UWB system this term understand their ability to borrow unused portions of the spectrum, distributed between the primary users. Depending on the technology used ultrawideband, it is possible to perform different allocation methods. In particular, the main method of pulse systems that provide cognitive, is the formation of the pulse shape to fit it in order to free range. For multi UWB cognition provided a frequency hopping technique or orthogonal frequency division multiplexing. Produced an overview of existing methods of forming and processing of ultra-wideband signals and the problems arising from their use.
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NONLINEAR MATHEMATICAL MODELS OF COSTAS LOOPS
The classic mathematical models of Costas loop were considered. Limitations of simple linear models and their application to classic Costas loop were discussed. Effective approach to study Costas loop circuits based on nonlinear mathematical models was presented. Unreliability of simple SPICE-based numerical simulation of PLL-based circuits was explained.
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REGULAR AND CHAOTIC SELF-MODULATION MODES OF THE GENERATOR WITH AUTOMATIC FREQUENCY CONTROL
V.P. Ponomarenko, firstname.lastname@example.org,
Lobachevsky State University of Nizhni Novgorod, Nizhni Novgorod, Russia
Much attention is being paid to the study of the processes of formation and development of self-modulation modes in self-generating systems with phase and frequency control. The potential of these systems in terms of generating periodic and chaotic modulated oscillations is of immediate practical interest for creating effective sources of complex signals in the implementation of communication systems based on dynamic chaos. Some results of the study of dynamic modes in a system with frequency control in the case of using a fourth-order filter in the control circuit are presented. The case of positive feedback in the frequency control loop, which is realized by the inverse of the inclusion of the frequency discriminator, is considered. Increasing the filter complexity and inverting the frequency discriminator enable the number and variety of self-modulating modes excited in the system to be increased. The mathematical model of the considered system with frequency control is represented by the following dynamic system.
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4. Ponomarenko V.P. Dynamic modes in models of self-generating systems with frequency and frequency-phase control. News of universities. Applied nonlinear dynamics. 2007. Vol. 15. No. 3, pp. 33-51.
DYNAMICS QUALITAVE ANALYSIS OF FREQUENCY SYNTHESIZER WITH COMBINED CONTROL
O.G. Antonovskaya, V.I. Goryunov, email@example.com,
Nizhny Novgorod State University, Nizhniy Novgorod, Russia
Известно, что использование степени заполнения счетчика числа колебаний подстраиваемого генератора (ПГ) в качестве фазовой координаты позволяет не только обоснованно реализовать процедуру получения разностных уравнений по методу точечных отображений, но и расширить возможности качественного анализа динамики синтезаторов частот (СЧ) с кусочно-постоянной формой сигнала управления. На примере базового СЧ с комбинированным импульсным частотно-фазовым детектором, объединяющим в себе свойства частотного детектора и детектора типа «выборка-запоминание», показывается, что использование метода точечных отображений в соответствующих подпространствах состояний позволяет не только проанализировать механизм взаимодействия фазового и частотного управления, но и осуществить полное качественное исследование его динамики.
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SIMULATION OF HYBRID SYSTEM PHASE AND CLOCK SYNCHRONIZATION WIDEBAND SIGNAL
To detect broadband signals, in particular GPS signals, a hybrid phase and clock synchronization system is used. The delay tracking circuit determines the start of a pseudo random sequence. It generates two codes, one of which is delayed for a while, and the other is ahead of the input code by the same amount. The leading and lagging codes are multiplied with the reference one, pass through the integrators with a reset, and are sent to the discriminator in order to generate the main signal, which must completely coincide with the input time. Further, this code is multiplied with the input signal, and thereby annihilates the code in the input signal. At the output of the multiplier, there remains a carrier frequency, modulated only by an information signal and not modulated by a pseudo random sequence. This signal is fed to the Costas circuit, which extracts the information signal, and also generates a frequency that matches the carrier frequency of the input signal. A signal of this frequency is multiplied with the input. At the output of the multiplier there is a low-frequency signal and a signal with a frequency of 2ω0, which is suppressed using a low-pass filter, which is located at the output of the multiplier. Thus, only the low-frequency signal — a pseudo-random sequence folded modulo 2 with the information signal and not modulated by the carrier — is input to the delay tracking circuit.
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