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

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Calibration of a Planar Scanner for Near-field Antenna Measurements

Calibration of a Planar Scanner for Near-Field Antenna Measu...

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2020 systems of signals generating and processing in the field of on board communications

作者： Snastin, M.V. Dobychina, E.M. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9781728147727

The main goal of the work is to increase the near field measurement accuracy of antennas characteristics by performing calibration of planar scanner. This becomes possible when using the phaseless switching method for the diagnostics of amplitude and phase scanning errors. The novelty of the proposed solution lies in the fact that the phase state changing of the channel under calibration is performed without the usage of phase shifters by digital methods only. During the research process a simulation model of the calibration process was developed. That model was shown the convergence of the algorithm for any values of phase and amplitude errors. Special software for automatic estimation of measurement errors was developed. Experimental studies of a planar scanner in an anechoic chamber were carried out. The obtained results turn it possible to reduce the amplitude and phase measurement errors in the process of moving the scanner to values corresponding to the industrial standards of high-end devices. © 2020 IEEE.

关键词： Calibration

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Modeling and Comparison of Trajectory Filtering Algorithms in MLAT systems

Modeling and Comparison of Trajectory Filtering Algorithms i...

引用

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

作者： A. A. Chugunov R. S. Kulikov V. B. Pudlovskiy N. I. Petukhov N. V. Masalkova National Research University MPEI Moscow Russia

In this article, an algorithm for determining RRS coordinates on the basis of Extended Kalman Filter with the processing of Time of Arrival (ToA) type measurements is proposed. The feature of the proposed algorithm is to determine the radio radiation source (RRS) time of transmission (ToT) in the MLAT system time scale and its filtration using priori information about the period of transmission. It's shown that evaluation of ToT and its filtration at a known period allows you to get closer to the accuracy provided by Time Of Fligth (ToF) method, which can not be implemented directly for MLAT systems. This hypothesis was confirmed by modeling several algorithms: one-step TDoA, filtered TDoA, filtered ToA and one-step ToF. Modeling was performed for both the known constant period and the non constant period. In both cases, the efficiency of the proposed ToA-F algorithm was the same. The efficiency of various algorithms was compared, including the traditional ones based on the calculation of arrival time differences and the proposed one based on ToA observations and using information about transmission period. The most important result was that the ToT estimation and filtering allows to achieve the properties of the ToF method in the MLAT system.

关键词： Location awareness Coordinate measuring machines Filtration Estimation Filtering algorithms Information filters Time measurement

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Electric Propulsion System Simulation as Basis for the Electric Vehicle Digital Twin Development

Electric Propulsion System Simulation as Basis for the Elect...

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

作者： K. M. Sidorov A. G. Grishchenko B. N. Sidorov V.I. Stroganov Moscow Automobile and Road Construction State Technical University (MADI) Moscow Russia

Given the current automobile industry development state and its outlined trends we can confidently assert that the intrinsic part of implemented technologies both in near and far future will comprise of powertrain electrification in order to aid low-carbon development, complex intellectualization of vehicles and associated infrastructure. Thus, aspects mentioned above explain the objective topicality for creation of an electric vehicle virtual copy, digital twin, based on electric vehicle components and systems simulation. This being said, simulation models as such, apart from traditional use in theoretical studies at the development stage, become part of a strictly practical application - real vehicle operation. The present article suggests a traction inverter with integrated charger simulation model implementation as a part of a complex electric vehicle propulsion system simulation. Basic equation systems are applied in presented complex simulation that are fundamental for component simulation model and presented as structural schemes for further software implementation. The article additionally focuses on recreation of a fast charger as part of a suggested traction inverter. The depicted simulation model allows recreation of electric propulsion system processes in a scope of electric vehicle operation modes.

关键词： Computational modeling Digital twin Propulsion Electric vehicles Inverters Software systems simulation

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Learning-Based WiFi Fingerprint Inpainting via Generative Adversarial Networks

Learning-Based WiFi Fingerprint Inpainting via Generative Ad...

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International conference on Computer communications and Networks (ICCCN)

作者： Yu Chan Pin-Yu Lin Yu-Yun Tseng Jen-Jee Chen Yu-Chee Tseng College of Artificial Intelligence National Yang Ming Chiao Tung University Tainan City Taiwan

ISBN: (数字)9798350384611

ISBN: (纸本)9798350348439

WiFi-based indoor positioning has been extensively studied. A fundamental issue in such solutions is the collection of WiFi fingerprints. However, due to real-world constraints, collecting complete fingerprints at all intended locations is sometimes prohibited. This work considers the WiFi fingerprint inpainting problem. This problem differs from typical image/video inpainting problems in several aspects. Unlike RGB images, WiFi field maps come in any shape, and signal data may follow certain distributions. Therefore, it is difficult to forcefully fit them into a fixed-dimensional matrix, as done with processing images in RGB format. As soon as a map is changed, it also becomes difficult to adapt it to the same model due to scale issues. Furthermore, such models are significantly constrained in situations requiring outward inpainting. Fortunately, the spatial relationships of WiFi signals and the rich information provided among channels offer ample opportunities for this generative model to accomplish inpainting. Therefore, we designed this model to not only retain the characteristic of regression models in generating fingerprints of arbitrary shapes but also to accommodate the observational outcomes from densely deployed APs. This work makes two major contributions. Firstly, we delineate the distinctions between this problem and image inpainting, highlighting potential avenues for research. Secondly, we introduce novel generative inpainting models aimed at capturing both inter-AP and intra-AP correlations while preserving latent information. Additionally, we incorporate a specially designed adversarial discriminator to enhance the quality of inpainting outcomes.

关键词： Location awareness Adaptation models Solid modeling Shape Fingerprint recognition Robot sensing systems Generative adversarial networks

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The Analysis of Traffic Balancing for Data Centers Serving Requests of LEO Mobile Satellite systems

The Analysis of Traffic Balancing for Data Centers Serving R...

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

作者： S. N. Stepanov A. V. Korobkina A. O. Volkov E. E. Malikova A. E. Panov Moscow Technical University of Communications and Informatics Moscow Russia Moscow Institute of Physics and Technology (National Research University) Moscow Russia

One of the features of low earth orbit (LEO) mobile satellite systems is to deliver information to the data analytic centers. Many types of alarm information are collected by smart meters and video cameras that are placed where wired telecommunication is not possible due to the technical or economic meanings. It is supposed that requests for servicing are arriving to the data center following the Poisson model and each requiring exponentially distributed computing time. A data center consists of some number of computing units. Each unit processes the requests according to the Processor Sharing (PS) service discipline and cannot accept at the same time more than fixed number of requests. The mathematical model of load balancing between computing units is constructed. Two scenarios are considered: “static” when requests are routed to computing units according to the prescribed probabilities and “greedy” when requests are routed to the least loaded computing unit. Using the model, the main performance measures of interest are given with help of values of probabilities of model's stationary states. The recursive algorithm of performance measures estimation is suggested. The model and derived algorithms can be used for study the scenarios of traffic balancing at the data analytic centers.

关键词： Data centers Satellites Data analysis Computational modeling Stationary state Low earth orbit satellites Extraterrestrial measurements

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High Efficiency Power Amplifier for IoT Applications: RF Path

High Efficiency Power Amplifier for IoT Applications: RF Pat...

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2020 systems of signals generating and processing in the field of on board communications

作者： Varlamov, O.V. Gromorushkin, V.N. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781728147727

IoT devices must remain operational for 10 years with one set of batteries. Most power is typically consumed by an RF power amplifier, which is necessary for transmitting data over a wireless radio channel in 5G networks. For this reason, the task of increasing the efficiency of an RF power amplifier is relevant. High efficiency can be achieved by using active element switching modes in combination with 'synthetic' amplification methods. This article analyzes the energy characteristics of a Class D switching power amplifier with a filter for two configurations: voltage mode and current mode for various transistor saturation times (Duty Ratio). Based on the analysis of time diagrams, integral equations are written, the solution of which allows us to derive calculation formulas. The results of calculations are presented. It is shown that the mode of working with meanders is most advantageous, while the VMCD circuit should work at τsat≤π, and in the CMCD circuit should work at τsat≥π. © 2020 IEEE.

关键词： 5G mobile communication systems

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Comparison of the Spectral and Hierarchy Analysis Methods Applicability for Technical systems Choosing

Comparison of the Spectral and Hierarchy Analysis Methods Ap...

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

作者： V. A. Dokuchaev V. V. Maklachkova S. V. Pavlov S. S. Mytenkov Moscow Technical University of Communications and Informatics Moscow Russia HSE Moscow Russia

ISBN: (纸本)9781665415484;9781665446983

This article discusses the fundamental features of the application of the decision support system on the example of solving the problem of planning the process of managing technical systems of wireless access to Enterprise Infocommunication Network. The purpose of this article is to consider approaches to the automatic selection of the optimal technical solution for promising business and technological process management systems based on the methods of spectral analysis and analysis of hierarchies. The system analysis technique is developed and applied if the decision-maker does not have the necessary information about a certain situation, allowing it to formalize and find a solution to the problem. Decision-making in management activities is based on a specific type of intellectual activity - information and analytical activities, as a set of activities for the search, collection, processing of information, its assessment, analysis and forecasting of the state of the control object. The importance of information and analytical activities in modern conditions is sharply increasing due to the following reasons: a sharp increase in the volume of information processed in the course of decision-making on management; the difficulty of identifying and establishing cause-and-effect relationships in information about the existing area of management; the complexity of process automation in advanced business and technological process management systems. This necessitates the creation within the framework of a promising automated control system of its specific part - a decision support system. The proposed method of Spectral Analysis Method and the Hierarchy Analysis Method of automatic selection of the optimal technical solution for promising control systems allows automating the process of evaluating the effectiveness and choosing the optimal technical system, in particular, choosing the most optimal means of wireless access to the corporate infocommunication network.

关键词： Wireless communication Decision support systems Decision making Process control Control systems Search problems Planning

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Information and Reference systems in Corporate Communication Networks

Information and Reference Systems in Corporate Communication...

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

作者： I. V. Stepanova O. D. Gerasimova O. B. Polyakova Moscow Technical University of Communications and Informatics Moscow Russia

There is a rapid development of means of fixed and mobile user access to reference and information services. Multimedia communication services are in demand. Accordingly, the functionality of call service centers is expanding. We will discuss improvements in call recognition and distribution. Solutions for the organization of robotic systems are proposed. Software developers take into account the wishes of customers of commercial structures and the special requirements of law enforcement and public safety authorities. Using the example of Asterisk or Naumen Contact Center, we will determine the prospects for the development of call service centers of commercial structures. Outsourcing options considered. Let us discuss the peculiarities of servicing emergency calls in the centralized “System 112”. Operators of “System 112” service transit traffic by issuing electronic notification of incidents. Several emergency services (for example, police, firefighters, ambulance) will receive information about serious emergencies from the operators of the “Service 112”. Let us discuss the tendency of organizing a single call-center in distributed corporate communication networks using a specific example, when calls can come from users of different regions of Russia - Central Russia, Siberia, Far East region. The organization of such a center involves the use of the distance factor. Supervisors organize day and night shifts for operators. An example of calculating the resources of such a center is considered. The creation of large call service centers in the South- West Siberia region is possible with the involvement of satellite communications resources.

关键词： Law enforcement Social networking (online) Organizations Switches Telephony Software Workstations

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Ground Urban Passenger Transport in a Period of Digital Transformation

Ground Urban Passenger Transport in a Period of Digital Tran...

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

作者： V. M. Vlasov G. D. Linnik Moscow Automobile and Road Construction State Technical University (MADI) Moscow Russia «Trans Sensor» LLC Moscow Russia

The article describes the impact of digital technologies to improve the efficiency and quality of passenger transportation on urban ground passenger transport. The impact of new requirements to the organization of the transportation process and the role of data enrichment from different automated systems to create new services for all consumers are considered. The preconditions and practical deviations influence examples in individual subsystems on complex performance indicators are considered. Transport planning role, instrumental methods of collecting information in problem solving of increasing land-based urban passenger transport efficiency is shown. It is shown that an important element of digital transformation is route spatial digital model creation of urban passenger transport, an analytical description of track of the route, which is used in process of vehicles movement operational control. The influence of instrumental methods use of obtaining information on social standards observance for transport services quality is described. Goals and objectives of dispatching control and management of routed traffic are described, the main of which are deviation operational recording of actual traffic from the planned one, preventing an increase in traffic intervals, irregular runs, runs disruptions and consequences eliminating of violations and deviations. The role of transport services social standard for population, approved by the Ministry of Transport of Russia, in the transportation implementation of passengers and luggage by automobile transport and urban land electric transport is described.

关键词： Industries Tracking Digital transformation Instruments systems operation Urban areas Transportation

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Stagnation in the Development of Internal Combustion Engines as a Factor of Transition to More Perfect Power Units

Stagnation in the Development of Internal Combustion Engines...

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

作者： V. A. Rakov B. S. Subbotin A. M. Ivanov A. V. Podgornyy Vologda State University Vologda Russia Moscow Automobile and Road Construction State Technical University (MADI) Moscow Russia

The article analyzes trends in the design of car engines. It assesses the impact of modern engine designs on the economic safety and efficiency of automobiles. The authors provide a combined graph of changes in the design of internal combustion engines over the past 30 years, which shows that their further development is stalling, indicating stagnation. The article also analyzes the impact of improved environmental friendliness on design complexity and reliability. As a result of the analysis, it has been found that the maintenance of the technical condition of an engine is becoming more and more expensive. This inevitably increases the number of defective vehicles in operation with poor environmental performance. The results of comparing normative and actual emissions also confirm this. This article compares the aggregate environmental emissions from vehicles with different engine types at all stages of their life cycle, which shows the prospects for the development of hybrid vehicles. Comparison of fuel consumption of vehicles with both hybrid and gasoline engines of similar power, operated under the same conditions, is given by months during one year. According to the authors, the constant development of vehicle performance should inevitably lead to the natural emergence of radically new designs, which will have higher performance properties and will set the development of vehicle power units in the coming decades.

关键词： Economics Internal combustion engines Maintenance engineering Reliability engineering Market research Hybrid power systems Safety

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