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检索条件"任意字段=2018 Systems of Signals Generating and Processing in the Field of on Board Communications"

共 514 条记录，以下是381-390 订阅

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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 for Calculating the Mass of a Vehicle in Dynamics using a Discrete Piezoelectric Sensor in Automatic Weight and Dimensional Control systems

Methodology for Calculating the Mass of a Vehicle in Dynamic...

引用

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

作者： Kh. A. Dzhabrailov M. E. Chantieva R. A. Gematudinov A. V. Ilyukhin I. V. Safyanov Moscow Automobile and Road Construction State Technical University (MADI) Moscow Technical University of Communications and Informatics Moscow Russia Moscow Automobile and Road Construction State Technical University (MADI) Moscow Russia

The technique of calculation of vehicle weight with the use of discrete piezoelectric sensor for automatic weight and dimensional control systems of vehicles, allowing to make calculations with the least errors in comparison with the existing monocrystal analogues, is presented. Improving the accuracy of measurements is necessary to improve the quality of the procedure for assessing the physical characteristics of the vehicle at the points of automatic weight and dimensional control.

关键词： Weight measurement Roads Tire pressure Wheels Process control Quality control Control systems

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Interference Compensator for Communication systems with Space-Time Coding

Interference Compensator for Communication Systems with Spac...

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

作者： S. A. Samoylov A. G. Samoylov S. A. Nasir I. A. Al Tahar Vladimir State University named after Alexander and Nikolai Stoletovs Vladimir Russia Iraqi Technological University Vladimir State University named after Alexander and Nikolai Stoletovs Vladimir Russia

ISBN: (纸本)9781665415484;9781665446983

The known methods of signal processing of information transmission systems with space-time coding are quite successful in combating signal fading. However, these methods do not reduce the influence of external interference signals correlated in different reception channels. The article proposes a method for compensating external interference to systems with space diversity. The structure of the interference compensator is described. The method has been experimentally investigated. The experiments used a communication system with 2x space diversity. The proposed interference compensator showed the ability to suppress external narrow-band radio interference by at least 40 dB, and broadband barriers by 15 dB.

关键词： Fading channels Spatial diversity Electromagnetic interference Information processing Encoding Broadband communication

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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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Implementation of an Algorithm for Intelligent Tuning of Operating Frequencies for Cognitive Radio systems

Implementation of an Algorithm for Intelligent Tuning of Ope...

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

作者： E. O. Kandaurova D. S. Chirov Moscow Technical University of Communications and Informatics Moscow Russia

This article discusses the issues of practical implementation of the previously developed algorithms for intelligent tuning of operating frequencies in cognitive radio systems. Two SDR devices of the LimeSDR type were used as a model of the cognitive radio system. An OFDM signal with an adaptive signal-code structure is used as a system signal. Service information about the parameters of the signal-code structure and the number of the frequency channel of the next frame is transmitted in the pilot signal subcarriers. To implement the algorithm, special software has been developed. Experimental studies were carried out with the use of software, where it was shown that the use of an algorithm for predicting the occupancy of frequency channels can reduce the time of operational scanning of the spectrum.

关键词： Time-frequency analysis Frequency modulation OFDM Software algorithms Prediction algorithms Software Hardware

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The Autonomous Object Trajectory Correction Using Neural Networks

The Autonomous Object Trajectory Correction Using Neural Net...

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

作者： Z. V. Ilyichenkova S. M. Ivanova A. I. Volkov A. Yu. Ermakova MIREA - Russian Technological University Moscow Russia Moscow Technical University of Communications and Informatics Moscow Russia

The issue of using neural networks to construct and correct the transport object trajectory is considered in this article. The control system, which includes the analysis of general unchangeable information received from global sensors, is considered. The decision on the need to change the trajectory is made depending on the data received from sensors located directly on the object. A method is proposed for correcting the autonomous object route depending on the occurrence of stationary obstacles during movement. A neural network is defined that minimizes the functional characterizing the cost of movement and its safety, taking into account the rebuilding.

关键词： Neural networks Sensor phenomena and characterization Control systems Sensor systems Trajectory Safety

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Space-Frequency Beamforming Algorithms Comparison with a Circular Antenna Array

Space-Frequency Beamforming Algorithms Comparison with a Cir...

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

作者： E. I. Glushankov V. I. Tsarik The Bonch-Bruevich Saint Petersburg State University of Telecommunications Saint Petersburg Russia LLC "Airtago" Saint Petersburg Russia

The interference cancellation problem for the satellite navigation systems is considered. The space-frequency adaptive processing algorithms that use the digital beamforming technique are described. Different beamformers with and without the interference sources number (ISN) and directions (ISD) determination are presented. The algorithms of filter input signal sample correlation matrix calculation and inversion, the ISN and ISD determination and the processing quality function extremum search are described. The computer modelling of processing of real satellite signals recorded with use of a circular antenna array using the suggested algorithms is implemented. The comparative analysis of the performance quality of the processing algorithms and their separate inner procedures is carried out. The algorithms with the best performance quality metrics are identified. The validity of the jamming suppression problem solution using the suggested algorithms and the possibility of using them in the real interference-protected satellite navigation systems are confirmed.

关键词： Satellite antennas Satellites Correlation Array signal processing Computational modeling Parallel processing Satellite navigation systems

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Peculiarities of Instantaneous Frequency and Envelope of CFSKn-n-Signal in the Channel with Memory

Peculiarities of Instantaneous Frequency and Envelope of CFS...

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

作者： R. R. Fayzullin I. M. Lerner V. L. Odintsov V.I. Il'in G. A. Garifullina Kazan National Research Technical University n.a. A.N. Tupolev - KAI (KNRTU-KAI) Kazan Russia Kazan (Volga region) Federal University Kazan Russia Kazan National Research Technological University Kazan Russia

The article is dedicated to the study of peculiarities of the behavior of the envelope and instantaneous frequency of the CFSK-n-signal at the output of channel with memory caused by it frequency selective properties. New properties and phenomena are revealed that allow to increase the efficiency of communication systems with this type of signals, built on the basis of the theory of resolution time.

关键词： Time-frequency analysis Communication systems Memory management Signal resolution

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Classification of Integration Platforms of Intelligent Transport systems

Classification of Integration Platforms of Intelligent Trans...

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

作者： A. I. Vorobyev A. A. Koveshnikov M. V. Gavrilyuk T. V. Vorobyeva D. Yu. Morozov Department Road Traffic Management and Safety Moscow Automobile and Road Construction State Technical University (MADI) Moscow Russia

Integrated automation in the transport industry contributes to improving the quality of transport services provided. The introduction of integrated automation in the field of intelligent transport systems (ITS) is possible thanks to the introduction of integration platforms that will allow optimal use of the resources of ITS subsystems. The article describes the main tasks that can be solved using the integration platform. It also describes the main functional characteristics of the integration platform and the place of the integration platform in ITS architectures. Using the example of two implemented projects, the experience of implementing integration is presented.

关键词： Industries Automation Software algorithms Computer architecture Documentation Software Task analysis

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Development of a Model of Distributed Computing systems

Development of a Model of Distributed Computing Systems

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

作者： V. A. Savin S. V. Shevelev P. D. Shulpina D. V. Gadasin Moscow Technical University of Communications and Informatics Moscow Russia Moscow State University of Civil Engineering (National Research University) Moscow Russia

The universal popularity of distributed systems is due to the increasing number of devices interacting with each other. A distributed system can be represented as a graph, and its functioning is described as a set of processes in this graph. In this paper, a model of using a cylindrical coordinate system to represent the system is proposed. The abscissa of one plane will simultaneously be the ordinate of the other plane. For unambiguous identification, the corresponding quarter number is added to the attributes of the process or event. In the next step, the cylindrical system is combined with the Cartesian one. This approach will allow us to separately consider two or more absolutely identical processes with matching events.

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