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systems of signals generating and processing in the field of on board communications

作者： A. G. Erokhin M. F. Vanina N. V. Toutova Moscow Technical University of Communications and Informatics Moscow Russia

One of recent advances in innovation computer technologies is widely using of on-board computing complexes. The major part of the on-board computing complex is the on-board information and computing network. Its main purpose is to ensure the reliable operation of on-board equipment. To design an on-board information and computer network, it is necessary to develop its mathematical model at the first stage. At the same time, most of the available models imply the working of network users with a “simple dialogue mode”, i.e. do not take into account the real technology of their work. However, it is possible to identify typical tasks solved by each of the users of the network, and describe in detail their working technology. Detailed consideration of network user's operation technology and its inclusion in the model can have a significant impact on its probabilistic and temporal characteristics. We consider some examples of such models by using closed queueing networks.

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Software-Defined Radio Wireless Communication Technology Design. LibreSDR board Validation

Software-Defined Radio Wireless Communication Technology Des...

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systems of signals generating and processing in the field of on board communications

作者： Vladimir Grigoriev Alexander Komissarov Konstantin Ryutin Grigoriy Fokin Department of Wireless Networks “Laboratory of Infocommunication Networks” Limited Liability Company Saint Petersburg Russia Software Defined Radio Laboratory The Bonch-Bruevich Saint Petersburg State University of Telecommunications Saint Petersburg Russia

Currently, most of the technical solutions for wireless communications and navigation systems prototyping and validation in academic and scientific community employ Software Defined Radio (SDR) technology. However, wider utilizing of popular and well proven SDR platforms, such as USRP (Universal Software Radio Peripheral), LimeSDR and AD-FMCOMMS boards, is still difficult due to high cost and low availability. One of the solutions to popularize and make SDR wireless communication technology design more accessible for academic and scientific community is the emerging low-cost SDR-platform LibreSDR. Current work is devoted to experimental validation of LTE compliant transmission and reception of reference signals on physical layer, using LibreSDR board. The results of the experimental validation prove the potential of relatively low-cost LibreSDR utilization for wireless communications and navigation systems prototyping with the same performance, as well known USRP boards, among young scientists and students during their education and research in the academic and scientific community.

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Methodology of Design High Heat Flux for On-board Radars of Small-Sized Aircraft

Methodology of Design High Heat Flux for On-Board Radars of ...

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systems of signals generating and processing in the field of on board communications

作者： A. V. Starenchenko M. N. Ushkar A. S. Kuznetsov Moscow Aviation Institute (National Research University) Moscow Russia

ISBN: (纸本)9781665415484;9781665446983

The methodology is intended to solve the problem of the layout solutions' optimisation of high heat flux on-board radars' structures of small-sized aircraft forced air cooling systems with a limited air flow. The methodology is characterized by a systematic approach and includes solving the external and internal problem of providing the normal thermal regime of the airborne radar structure via optimizing its layout solutions at the early stages of design. The solution of the external problem is the determination of the permissible aerodynamic drag of the structure, with a restriction on the cooling air flow. The solution of the internal problem is the determination of the optimal layout design. The optimisation criteria is the minimum temperature of the airborne radar components, with a restriction on the aerodynamic drag. The field of application of the results obtained is the systems of forced air cooling of electronic devices and devices operating under conditions of a limited flow of cooling air.

关键词： Heating systems Cooling Airborne radar Layout Aerospace electronics Reliability engineering Aerodynamics

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Evaluation of the Efficiency of Blind Signal Separation in the Problem of Detecting BPSK signals

Evaluation of the Efficiency of Blind Signal Separation in t...

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systems of signals generating and processing in the field of on board communications

作者： N. Yu. Liberovskiy D. S. Chirov V. S. Priputin Moscow Technical University of Communications and Informatics Moscow Russia

This paper investigates the effectiveness of the blind signal separation algorithm in the problem of detecting digital BPSK signals. The classical methods of blind separation of signals and criteria for signal independence are considered. A model of the studied algorithm for blind signal separation is shown, based on the calculation of a mixing matrix that brings the joint cumulants of the second and fourth orders to zero. To exclude a trivial solution, additional restrictions are imposed on signal dispersions. A system of equations for finding the mixing matrix coefficients is presented. The form of the coefficients of the mixing matrix is shown, which brings the signals to an uncorrelated form. The possibility of an analytical solution of the equation associated with the equality of the joint fourth-order cumulant to zero is shown. A model of modulation and detection of digital signals is described. The simulation result of the blind signal separation algorithm is presented graphically. The efficiency of the proposed algorithm is shown.

关键词： Simulation Bit error rate Signal processing algorithms Modulation Interference Blind source separation Binary phase shift keying

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Simulation of Fast Transformation Procedures in Galois fields to Estimate Efficiency of Perspective signals Generation and processing Devices

Simulation of Fast Transformation Procedures in Galois Field...

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systems of signals generating and processing in the field of on board communications

作者： V. Y. Mikhaylov R. B. Mazepa Moscow Aviation Institute (National Research University) Moscow Russia

ISBN: (纸本)9781665415484;9781665446983

The object of consideration is design automation and prototyping of complex signals and their generation and processing devices. The subject of the analysis is the substantiation of the structure, composition and implementation method of a modeling system aimed at modeling and prototyping promising devices for the generation and processing of complex signals based on fast transformations in Galois fields. The purpose of the analysis is a reasonable choice of methods and tools for computational, simulation and prototyping that achieve high display accuracy, performance, flexibility and ease of modeling. The solutions are based on the principles and mathematical models developed by the authors: methods and algorithms for fast transformations in Galois fields, an algebraic representation model and the structure of fast delay acquisition devices for a subclass of sequences. The article is devoted to the development of a software and hardware modeling systems that allows the most accurate mapping of fast algebraic transformations in Galois fields to algorithmic models of various levels of representation to ensure high performance, flexibility and ease of modeling, as well as prototyping of promising devices for the generation and processing of complex signals. The results of the work will be useful in the design of promising devices of various information and communication systems, scientific research, as well as in the educational process.

关键词： Performance evaluation Analytical models Computational modeling Software algorithms Tools Software Hardware

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Dynamic Measurements Accuracy Increasing of Digital Measuring Device for On-board Radio Electronic Equipment

Dynamic Measurements Accuracy Increasing of Digital Measurin...

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systems of signals generating and processing in the field of on board communications

作者： E. P. Stroganova S. E. Grychkin Moscow Technical University of Communications and Informatics Moscow Russia

In this paper we discuss the problem of dynamic measurements of digital measuring device for on-board radio electronic equipment. For such a measuring device, when a moving object moves under conditions of influencing noise, the accuracy of measurements decreases. The problem of increasing the accuracy of such dynamic measurements is considered. This article proposes the method for increasing accuracy for on-board radio electronic digital device applied at the moving object with on-board electronic equipment. Theoretical consideration of the accuracy of navigational determinations of the onboard measuring device under noise conditions and taking into account the object's movement dynamics is carried out. The article provides a theoretical analysis and computer simulation of the considered digital measuring device for on-board radio electronic equipment. It has been found that when combining on-board navigation and radio communication facilities are usually used to improve the accuracy of navigation determinations by implementing differential operating modes, it is possible to improve the accuracy of dynamic measurements.

关键词： Electronic equipment Computer simulation Radio navigation Personal digital devices Noise measurement Radio communication

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Gradient Magnetic field Signal Phase-Frequency Coding Modification for Data Regularization in Magnetic Resonance Imaging

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Radioelectronics and communications systems 2021年第6期64卷 281-292页

作者： Netreba, A.V. Naguliak, O.A. Komarov, A.O. Taras Shevchenko National University of Kyiv Kyiv Ukraine

Abstract: The reconstruction of tomograms in magnetic resonance imaging (MRI) has been considered for different degrees of transverse gradient instability of magnetic field. A method for minimizing the impact of deviation of resultant points of signal measurements from regular positions on the quality of reconstructed tomograms was proposed. The ultimate values of parameters of field gradient instability with due regard for the possibility of their compensation were determined in processing of real tomographic images. A series of multiple procedures for generating signals under conditions of different spread of magnetic field components and subsequent reconstruction was conducted for estimating the impact of instability on the accuracy of final results. It has been shown that the building and joint analysis of several tomographic distributions for different angles of orientation of magnetic gradient system for the transverse phase-frequency coding of response signal improves the structure of diagnostic data. In solving the inverse problem of restoring the spin distributions, the compensation of distortions caused by the irregularity of grid for forming data through combining an array of measurements performed under different conditions was obtained. The estimation of qualitative parameters of reconstruction of two-dimensional tomographic high-resolution distributions was conducted for the case of measuring the response signal for two and three orientations of its transverse coding. © 2021, Pleiades Publishing, Ltd.

关键词： Magnetic resonance imaging

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Analysis of Power Spectrums in Heart signals to Detect the Presence of Low-Amplitude High-Frequency Components

Analysis of Power Spectrums in Heart Signals to Detect the P...

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systems of signals generating and processing in the field of on board communications

作者： D. Yu. Ryabov O. A. Mukhametzyanov S. S. Sedov T. F. Shcherbakova Department of Radio-Electronic and Telecommunication Systems Kazan National Research Technical University Named After A. N. Tupolev - KAI Kazan Russia

Purpose of this study is effective registration of low-amplitude high-frequency components with predictive value - ventricular late potentials (VLPs) - in electrocardiosignals (ECS) by Ist standard lead. 232 signals were preliminary evaluated to detect VLPs by Simson’s method. VLPs were detected in 34 signals. Modification of signal-averaged approach was applicated to analyzed signals. Power spectrums of heartbeat signals’ terminal part were analyzed in this study. Designed algorithm showed 82.75% of correct decisions. Originality: new parameter to detect VLPs by Ist standard lead lead was proposed. Parameter’s threshold value is calculated. Threshold frequencies with maximal percentage of correct decisions were determined. Opportunity to detect VLPs in signals by Ist standard was evaluated: it is possible to detect VLPs using spectral analysis. Practical significance: results will be useful for ECS analysis block in telemedicine systems and onboard communications.

关键词： Heart Electric potential Heart beat Telemedicine Signal processing algorithms Lead Standards

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Some Generalization of the Theory of generating Functions

Some Generalization of the Theory of Generating Functions

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systems of signals generating and processing in the field of on board communications

作者： I. V. Chernova Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (数字)9781728147727

ISBN: (纸本)9781728147734

The author invites readers to consider some very unusual methods of calculations that he performed while solving the problem of analytic continuation of the Riemann function containing the critical strip inside of which there is an infinite set of nontrivial zeros of function by B. Rieman's hypothesis. Similar methods are used by the author when studying the properties of the generating function of Hermite polynomials with a nonnegative integer exponent.

关键词： generating function generalized summation of rows analytic continuation critical band the Riemann function ? (s) generating functions critical band infinite set RIEMANN FUNCTION Hermite polynomials

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Fractional Power Spectrums in Diagnostics of On-board Electronic Equipment of Monitoring, Measuring and Temperature Regulating systems

Fractional Power Spectrums in Diagnostics of On-Board Electr...

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systems of signals generating and processing in the field of on board communications

作者： V. V. Afanasiev S. S. Loginov Kazan National Research Technical University named after A. N. Tupolev - KAI Kazan Russia

ISBN: (数字)9781728147727

ISBN: (纸本)9781728147734

In this work, the development and research of the method and means of technical diagnostics of electronic equipment of the on-board monitoring, measuring and regulating temperature systems with thermocouple sensors according to fractional power spectra of signals were performed. The physical processes that cause typical malfunctions of low-frequency onboard electronic equipment with thermocouple sensors are investigated. Peculiarities of non-harmonic spectral analysis of signals and diagnostics of low-frequency electronic equipment of on-board systems for monitoring, measuring and regulating temperatures systems by fractional power spectra of signals are considered.

关键词： technical diagnostics generalized spectral analysis fractional power spectrum electronic equipment power spectra signal spectrum signals Diagnosis Spectra Physical Processes Thermocouple Temperature

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