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

共 238 条记录，以下是151-160 订阅

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The Principle of Unbundling During Thermal Engineering Calculations of On-board Digital Signal processing Devices

The Principle of Unbundling During Thermal Engineering Calcu...

引用

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

作者： A. I. Repneva Moscow Aviation Institute (National Research University) Moscow Russia

The article considers the possibility of applying the principle of unbundling in the thermal calculations of onboard signal processing devices. It is established that when performing such calculations, the problem of large time expenditures inevitably arises, as well as the need for a large number of system resources. The estimation of machine time and system resources costs is made in the case of splitting a General task into a number of subtasks on the principle of unbundling. A method is proposed for moving from lower-level tasks to higher-level tasks, taking into account the docking parameters. The estimation of saving of machine time and system resources costs is made when using the proposed principle of unbundling.

关键词： Performance evaluation Thermal engineering Heat engines Buildings Estimation Radar Digital signal processing

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Investigation of the Impact of Random Distribution Laws on the Characteristics of On-board Service Using Queuing Models

Investigation of the Impact of Random Distribution Laws on t...

引用

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

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

Ground handling is part of the work process of any onboard complex. The article presents a model of the process of such service, based on the queuing theory methods. The model based on the assumption that random values describing these processes may have arbitrary distributions, which in turn affects the quality of board service. Differences in the values of quality indicators can reach in the case of different distribution laws, they can differ by an order of magnitude, which can be of significant importance when deciding on the deployment of the next point of on-board service. The fundamental importance has that are investigated not the average values of service quality indicators, but their maximum values, which are guaranteed for a predetermined proportion of the entire flow of boards arriving for service.

关键词： Queueing analysis

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On-board Transmission Quality Assessment Using Short Audio Signal

On-board Transmission Quality Assessment Using Short Audio S...

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

作者： V. A. Abramov O. B. Popov T. V. Chernysheva V. G. Taktakishvili A. A. Ovchinnikov Moscow Technical University of Communications and Informatics Moscow Russian

Currently, there is no method for assessing the quality of information audio signal transmission over the transmission channel. According to Russian National Standard (GOST), simple stationary test signals should be used for channel evaluation. II additional processing devices should be disabled, while test signal is applied. Compact representation of signal and it's effect of signal quality are ignored. Based on the results of the research carried out by the authors, it is possible to determine the relationship between the change in a number of objective parameters and the subjective quality assessment from real listeners.

关键词： Time-frequency analysis Software algorithms Process control Frequency response Time measurement Software Quality assessment

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Design Software Package to Generation and Analysis of Digital signals for the Laboratory Workshop “Testing of Radio Equipment”

Design Software Package to Generation and Analysis of Digita...

引用

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

作者： A. E. Mikenin G. A. Prokurat A. V. Pestryakov Moscow Technical University of Communications and Informatics Moscow Russia

Digital laboratory work based on specialized hardware and software complexes is being actively implemented as part of the educational process. There is a strict time limit for students to perform a laboratory work, with a large amount of measurements needed. Because of this, it is necessary to optimize the workflow of educational test cases. This is unattainable when using several software products (that are not related to each other and even do not have compatible data exchange formats or protocols) within the same work. This article discusses the existing model of laboratory work, and ways to increase performance of students in the educational process.

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Establishment of Estimated Parameters Limits for On-board Radio Electronic Equipment

Establishment of Estimated Parameters Limits for On-Board Ra...

引用

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 establishment of estimated parameters limits for on-board radio electronic equipment. An indicator of compliance with a multi-parameter electronic equipment is proposed, based on minimizing the dimension of the vector of parameters that directly determine the objective function, approximating the tolerance region by hyperplanes, taking into account changes in parameters during operation. The correspondence indicator has the form of a hyperparallelepiped, and when assessing the correspondence, both the location of the point of the state space inside the parallelepiped and the distance from the point of the state space to the reference plane (the face of the hyperparallelepiped) can be determined. The example of using the developed indicator for analyzing the movement of an aircraft in an air corridor is proposed.

关键词： Electronic equipment Aerospace electronics Linear programming Aircraft Faces

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Features of Converting signals to Binary and Minimizing Distortion

Features of Converting Signals to Binary and Minimizing Dist...

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

作者： A. S. Adzhemov A. Y. Kudryashova Moscow Technical University of Communications and Informatics Moscow Russia

A well-known complex of methods for converting signals into binary digital form is shown, potential theoretically achievable boundaries of such conversions are determined. Values are calculated that indicate the value of the code distance between the original values and those obtained after transformation. Euclidean space metric. A correspondence is established between these messages and binary code combinations in the Hamming space. It is proved that in some cases the values that determine the distance between messages and the metric are quite general and should be clarified for specific situations. Distortion minimization is suitable for cases where the minimum code distances of the primary metric space are related to the minimum code distances of the secondary metric space. And also in the article the admissible limits of such minimization are found.

关键词： Binary codes Distortion Minimization Extraterrestrial measurements Entropy Optimization

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Restoration of Complex signals Distorted by Aliasing as a Result of Bandpass Sub-Nyquist Sampling

Restoration of Complex Signals Distorted by Aliasing as a Re...

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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 Kirov Russia

The purpose of this article is to develop a technique for recovering a complex signal distorted by aliasing as a result of sub-Nyquist bandpass sampling. The developed technique is based on the use of multichannel sampling. Its essence is that the signal is processed in several channels. All channels are analog-to-digital converted with different sampling rates, each of which leads to aliasing in its channel. For each channel, a system of equations is compiled that describes the corresponding aliasing. The joint solution of these systems of equations makes it possible to restore the distorted signal. Consideration in this article is limited only to first-order aliasing, in which no more than two aliases overlap at each frequency. This work is a continuation of the approach developed by the authors, called multichannel multirate sampling.

关键词： Digital signal processing Distortion

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The Influence of the Gordon-Mills-Welch generating Polynomial on its Autocorrelation Properties

The Influence of the Gordon-Mills-Welch Generating Polynomia...

引用

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

作者： A. I. Sattarova A. A. Egorov K. Yu. Ryumshin B. A. Efteev L. M. Kazadaev Moscow Technical University of Communications and Informatics Moscow Russia

This article deals with the generating of pseudo-random Gordon-Mills-Welch sequences with good autocorrelation properties for use in communication and data transmission systems, as spectrum-expanding sequences, scrambling and synchronization functions. Nowadays, there is a significant issue of pure detecting of signals in various types of radio channel. The proper solution of this issue provides new opportunities in the future research. The most important aim of usage of pseudo-random sequences is the reducing of influence of negative effects of channel and maximizing the probability of detecting the low-rate signal because of the unique form of autocorrelation function. Due to this feature, they are commonly used in the area of radars. The main goal of the article is to find out the exact types of Gordon-Mills-Welch sequences with suitable autocorrelation properties.

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Signal-Code Constructions for Wideband signals Based on M-Cpfsk and Non-Binary Error-Correcting Codes

Signal-Code Constructions for Wideband Signals Based on M-Cp...

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

作者： N. A. Kandaurov E. O. Lobova V. O. Varlamov K. E. Telengator Moscow Technical University of Communications and Informatics Moscow Russia

The article is devoted to the development of signal-code structures (SCC) for low-energy broadband radio links. The SCC is based on multi-frequency signals with a continuous phase (M-Cpfsk) and non-binary error-correcting codes (Non-binary low-density parity-check and turbo-like). An analysis is made of signal-code structures for bands up to 10 MHz with different parameters. These signal-code structures can be used for command-telemetry radio links from unmanned aerial vehicle (UAVs).

关键词： Radio links Autonomous aerial vehicles Error correction codes Decoding Broadband communication Wideband Signal to noise ratio

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Approach to Substantiating the Effectiveness of the Transition to SLA for Operators of Transport and On-board systems Providing Services Over IP Networks

Approach to Substantiating the Effectiveness of the Transiti...

引用

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

作者： S. A. Sidnev L. Y. Krasikova G. S. Artemeva V. A. Tsarenko Moscow Technical University of Communications and Informatics Moscow Russia

In the era of development of telecommunication technologies, triple-play services via IP networks in real time are of considerable interest both for operators of transport and on-board systems, and for consumers of services. One of the characteristic features of real–time applications is their sensitivity to delays and data packet losses. Even small packet transmission failures can lead to a significant decrease in the quality of audio and video programs. All this imposes additional requirements on operators of transport and on-board systems delivering audio and video streams to content providers, which should be taken into account in their SLA agreements. The article discusses the requirements for IP network operators to deliver audio and video streams with proper quality, and provides an approach to evaluating the operator's performance when switching to SLA work.

关键词： Sensitivity Tariffs Packet loss Switches Streaming media communications technology Real-time systems

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