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检索条件"任意字段=2020 Systems of Signals Generating and Processing in the Field of on Board Communications"

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Measuring Far-field Radiation Patterns of Digital Beamforming Antenna Arrays

Measuring Far-Field Radiation Patterns of Digital Beamformin...

引用

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

作者： V. I. Djigan Department of Integrated Circuits Design Methodology Institute for Design Problems in Microelectronics of RAS Moscow Russia

A method of the antenna array far-field Radiation Pattern (RP) measurement is considered. This method is designed for the usage with the receiving Digital Beamforming Antenna Arrays (DBAA). Such type of antenna arrays typically does not have a radiofrequency output. Hence, the standard methods of the RP measurement, based on the radiation and the reception of the monochromatic probing signal, cannot be used for the DBAA RP measurement. The proposed method assumes the radiation of a probing signal modulated by a pseudo-noise sequence and the base-band processing of the DBAA output signal by means of a matched filter or a correlator. The paper presents the description of the measurement setup and the mathematical explanation of the measuring procedure. It has been shown that the accuracy of the RP measurement depends on the Signal-to-Noise Ratio (SNR) at the outputs of the DBAA channel receivers, the number of the array channels and the number of the pseudo-noise sequence symbols. The accuracy increases on 3 dB each time as the number of the array antennas or the pseudo-noise sequence symbols is doubled. This result is confirmed by the simulation of the RP measurement of the eight and the sixteen channel linear antenna arrays with the usage of the maximum length pseudo-noise sequence of 1023 and 2047 symbols.

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Sub-Nyquist Sampling of Bandpass signals

Sub-Nyquist Sampling of Bandpass Signals

引用

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

作者： Vladislav Lesnikov Tatiana Naumovich Alexander Chastikov Alexander Metelyov Department of Radio Electronic Systems Vyatka State University Department of Radio Electronic Systems Vyatka State University Kirov Russia

The paper studies the process of folding the spectrum of a bandpass signal as a result of uniform sub-Nyquist sampling. Most publications on bandpass sampling consider optimal sampling to avoid aliasing. This article takes into account the possibility of aliasing of an arbitrary degree. The knowledge gained in this area is necessary for use in the study of multi-channel multi-frequency sampling, which provides the ability to restore a bandpass signal distorted by aliasing in channels. To make it possible to study the consequences of sub-Nyquist sampling at any ratio of sampling frequency and signal spectrum width and at any position of the signal on the frequency axis, at any degree of aliasing. Research is carried out on a plane whose axes are the lower bounding frequency of the signal band and the frequency itself. It is shown that the structure of this plane is a periodic continuation along both axes of a certain pattern. Therefore, it is enough to limit ourselves to studying only this pattern. The paper provides a structural analysis of this pattern and derives expressions that allow one to understand the consequences of sub-Nyquist uniform sampling for any of its parameters.

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On Improving the Efficiency of the Technical Vision System of the Robotics Complex

On Improving the Efficiency of the Technical Vision System o...

引用

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

作者： D. N. Bezumnov D. S. Chirov Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (数字)9798331532635

ISBN: (纸本)9798331532642

One of the most important elements of the groundbased robotic complex is the vision system. Taking into account the requirements for increasing the autonomy of robotic complexes, an important function of a robotic complex is the detection and recognition of objects in the field of view. The article is devoted to solving the problem of increasing the efficiency of object recognition by the vision system due to the integration of heterogeneous information: optical and radar images. A convolutional neural network was used as a recognition device. It is shown that the integration of information makes it possible to increase the efficiency of the technical vision system of the robotic complex by 38-43%.

关键词： Integrated optics Laser radar Machine vision Robot vision systems Optical computing Radar imaging Optical imaging Adaptive optics Optical sensors Convolutional neural networks

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Increasing of Determining Route Altitude Accuracy in Difficultly Accessible Regions Using Aerospace Technologies

Increasing of Determining Route Altitude Accuracy in Difficu...

引用

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

作者： A. D. Dymkov S. S. Dymkova ANO “IRIDA” Moscow Russia Institute of Radio and Information Systems (IRIS) Vienna Austria Moscow Technical University of Communications and Informatics Moscow Russia

A multifactorial methodology has been proposed that allows you to develop precisely constructed routes and solve specific problems, including taking into account weather conditions, terrain, etc. The experience gained during initial measurements showed that in difficult weather conditions it is very important to quickly, in real time, receive information about the situation on the ground. This will make it possible to make operational decisions on the use of equipment in work area. Advantage of the presented solution is also its autonomy. The obtained data were experimentally verified and compared. A methodology has been developed to achieve the goal set in the work, equipment has been selected for its implementation, and possibility of nodes interfacing used at software and hardware level has been shown. The technology proposed in this work for constructing and detailing routes can be used to more effectively represent the geographical features of a real area and, in particular, for the deployment of communication nodes taking into relief account, as well as in projects when creating various models.

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Effective Estimation of Motion Parameters of Mobile Robotic Complexes Based on Information processing of Technical Vision systems

Effective Estimation of Motion Parameters of Mobile Robotic ...

引用

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

作者： S. V. Sokolov S. A. Shvidchenko I. V. Reshetnikova E. V. Vavilova Rostov State University of Economics Rostov-on-Don Russia Moscow Technical University of Communications and Informatics Moscow Russia Don State Technical University Rostov-on-Don Russia

ISBN: (数字)9798331532635

ISBN: (纸本)9798331532642

The accuracy of positioning and determining the spatial orientation of mobile robotic systems (MRS) that monitor traffic conditions, urban infrastructure, assess emergency situations and their consequences, etc., directly depends on the efficiency of processing information received from machine vision systems (MVS). Some of the most effective methods for assessing the navigation parameters of MRS using MVS are methods based on calculating the velocity field of the optical flow reflected from the surface. At the same time, direct calculation of the velocity field is a very complex computational task. In the practical use of existing methods for processing optical flow based on various assumptions, the computational costs are often unrealizable for on-board computers, which makes it impossible to solve the navigation problem in real time. Due to the relevance of this problem, the article considers one of the possible options for its solution, based on solving a system of linear equations and providing minimal computational costs when determining the linear and angular velocities of MRS, easily implemented in the on-board computer in real time. A natural experiment was conducted to illustrate the effectiveness of the proposed approach.

关键词： Computers Accuracy Navigation Machine vision Estimation Real-time systems Mathematical models Computational efficiency Optical flow Surface treatment

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Methods for Increasing the Efficiency of Amplitude-Phase Modulated signals Power Amplifiers

Methods for Increasing the Efficiency of Amplitude-Phase Mod...

引用

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

作者： Quoc Fung Ngo O. V. Varlamov Moscow Technical University of Communications and Informatics Moscow Russia

Despite the widespread development of satellite mobile communications, radio communications in the high frequency range (3 - 30 MHz) retains its position when it is necessary to ensure over-the-horizon data transmission with low delays. The transmission speed of samples from the world's leading manufacturers reaches 120 kbit/s with a used radio channel width of 24 kHz. Manpack radios place high demands on weight and size characteristics, which are largely determined by the efficiency of the most energy-intensive unit - the power amplifier (PA). The article analyzes ways to increase the PA efficiency taking into account the features of modern telecommunication signals that use amplitude-phase modulation and have a large crest factor. Based on a preliminary analysis of a wide range of directions for increasing the radio frequency amplifiers efficiency, the most promising options for the problem under consideration are selected: a power amplifier with envelope elimination and restoration (EER) and an amplifier using the outphasing method. To date, the theoretical issues of constructing the EER PA and the prospects for its practical implementation have been better developed. At the same time, the potential capabilities of a transmitter built using the outphasing method are higher than those of the EER PA, since it does not have an inertial low-frequency envelope path, which reduces both energy performance and limits the possibility of improving quality characteristics. A conclusion is made about the advisability of further research, modeling, prototyping and testing of the transmitter using the outphasing method.

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Modeling of Blockchain systems in Internet of Things Networks

Modeling of Blockchain Systems in Internet of Things Network...

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

作者： Pavel Slyadnikov Natalia Toutova Andrei Erokhin Elena Frolova Margarita Vanina Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (数字)9798331532635

ISBN: (纸本)9798331532642

Blockchain technologies, due to their properties of decentralization, data immutability and cryptographic security, offer a promising solution for IoT networks. However, storing data in a blockchain may not always meet real-time requirements. When designing IoT networks that use blockchain for data storage, it is necessary to evaluate the probabilistic and temporal characteristics of the blockchain, such as the time of block formation and transaction confirmation. The paper proposes a queuing model for a blockchain network with the Proof of Work consensus algorithm. It is modeled as a closed queuing network with a complex dialogue structure between participants. The model could be used to design a blockchain for IoT systems that accounts for network characteristics and blockchain operation parameters.

关键词： Analytical models Memory Probabilistic logic Proof of Work Real-time systems Data models Blockchains Internet of Things Queueing analysis Digital signatures

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On the Performance of Specialized Distributed Computing systems Using Multiple Parallel Task Queues

On the Performance of Specialized Distributed Computing Syst...

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

作者： I. M. Gostev S. V. Bolovtsov Russian Scientific and Technical Society of Radio Engineering Electronics and Communications named after A.S. Popov Moscow Russia Russian Presidential Academy of National Economy and Public Administration (RANEPA) Moscow Russia

ISBN: (数字)9798331532635

ISBN: (纸本)9798331532642

Three variants of models of specialized distributed computing systems containing one, two and four parallel task queues are considered. Such systems are characterized by continuous non-stationary internal task flows. In these systems, the input tasks are parallelized into an a priori unknown number of data-independent subtasks. And when a certain subtask containing a solution is completed, all other branches of this task are deleted. The aim of the work was to study the behavior of such systems when they are organized with several parallel queues. The issues of changing the efficiency and performance of such systems with an increase in the number of queues are considered. Studies have shown that the use of several queues makes it possible to increase productivity without increasing computing resources.

关键词： Productivity Computational modeling System performance Planning Distributed computing

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Research and Development of Kubernetes Operator for Lightweight Multi-Access Edge Computing Platform Simulator

Research and Development of Kubernetes Operator for Lightwei...

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

作者： Ivan Filianin Nikita Borisov Vladimir Bogatyrev Faculty of Software Engineering and Computer Engineering ITMO University St. Petersburg Russia Faculty of Infocommunication Technologies ITMO University St. Petersburg Russia Department of Information Systems Security Saint-Petersburg State University of Aerospace Instrumentation St. Petersburg Russia

ISBN: (数字)9798331532635

ISBN: (纸本)9798331532642

This paper addresses the problem of deploying complex systems in Kubernetes clusters. It discusses using the OperatorSDK framework supported by RedHat as a basis for implementing the Kubernetes operator for Lightweight MultiAccess Edge Computing Platform Simulator (LWMECPS) deployment. Special attention is given to the operator Kubernetes architecture and how to use Operator Lifecycle Manager (OLM) to continuously deploy LWMECPS and machine learning models for it.

关键词： Computer languages Multi-access edge computing Codes Computational modeling Machine learning Computer architecture Complex systems Research and development

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Estimation of the Power of Algebraic Geometric Codes Designed to Construct a Post-Quantum Algorithm for Ensuring Information Security of On-board systems

Estimation of the Power of Algebraic Geometric Codes Designe...

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

作者： K. N. Pankov M. M. Glukhov Moscow Technical University of Communications and Informatics Moscow Russia

This paper continues the study of a post-quantum algorithm built on the basis of algebro-geometric codes, begun in previous works, in the interests of ensuring the information security of the Internet of things systems and on-board communication systems under the conditions of a quantum threat. The paper presents similar codes, the power of which lies above the Gilbert–Varshamov bound, and which can withstand known attacks on algorithms built on the basis of error-correcting codes.

关键词： Resistance Information security Estimation Hazards Error correction codes Decoding Cryptography

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