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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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Modeling the Algorithm of Cumulative Sums in the Applied Problems of Detecting the signals with Random Time of Occurrence in non-Gaussian Noise

Modeling the Algorithm of Cumulative Sums in the Applied Pro...

引用

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

作者： V. M. Artyushenko V. I. Volovach Technological University Korolev Russia Volga Region State University of Service Togliatty Russia

The methods of mathematical modeling of the cumulative sums algorithm in the problems of detecting signals with a random moment of occurrence in non-Gaussian noise are considered. The probability of false alarm errors and correct detection of imbalance based on the statistical characteristics of the algorithm of cumulative sums obtained by modeling real processes is calculated. An experimental distribution of the cumulative sum in state of imbalance at a current step for detection without reflecting or absorbing screens is obtained. A linear dependence between the means of the cumulative sum taken in separate sections is determined. Based on modeling real processes, the probability of correct detection and false alarm under the influence of non-Gaussian noise with a bimodal distribution is calculated. Effectiveness of cumulative sums algorithm both consistent and inconsistent with the density of the probability distribution of influencing noise is compared.

关键词： Probability distribution Random processes Mathematical model Signal detection

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The Effect of the Use of Service Level Agreement for Operators of Transport systems and On-board systems

The Effect of the Use of Service Level Agreement for Operato...

引用

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

作者： A. L. Zubilevich S. A. Sidney V. A. Tsarenko Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781665415484;9781665446983

Fiber-optic communication lines are the basis of telecommunication networks. If at the initial stage of the development of optical communication FOCLs were laid only on transport networks, then as this type of communication develops, there is a transition to fiber-optic technology in intra-facility, including on-board systems. Today, the demand for traffic transmission is constantly growing, which leads to an increase in the amount and speed of transmitted information. Fiber outages result in poor communications, disrupt business processes, backorders, and dissatisfied customers. Even small communication downtime causes huge losses. The introduction of service quality categories will simplify the operation of transport systems and increase the economic efficiency of communication networks. However, this requires significant capital expenditures and annual operating costs, which do not always pay off by avoiding fiber downtime. A method for assessing the effectiveness of the use of a service level agreement (SLA) between an operator of a fiber-optic communication line (FOCL) and consumers of communication services is proposed. The net present value (NPV) is used as an indicator of efficiency; probabilistic characteristics are introduced. The calculation results and their brief analysis are presented.

关键词： Economics Optical fiber networks Probabilistic logic communications technology Communication networks Service level agreements Business

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Research of an Ultra-Wideband Distributed Amplifier Based on field-Effect Transistors

Research of an Ultra-Wideband Distributed Amplifier Based on...

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

作者： Shmakov, N.D. Ivanyushkin, R. Yu Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781728147727

The main tasks are discussed in this paper such as in the construction of transmitters of digital television broadcasting, in particular the task of constructing a universal preamplifier, which can be used regardless of any particular channel. Distributed amplifiers permit to build wide-range power amplifiers with constant gain in the preset frequency range. The main feature of the construction of distributed amplifiers is using input and output capacitances of amplifying device in the artificial transmission lines. The main advantages and disadvantages of this type of amplifiers are presented in the paper. The method of calculation of distributed amplifier for UHF and the research its energetic characteristics are discussed in the paper. The further research tasks for this type of amplifier are given. © 2020 IEEE.

关键词： Power amplifiers

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The Application of the Joint Range and Speed Estimation Method in Short-Range Radars Using Ultra-Wideband signals with a Pseudo-Random Frequency Coding

The Application of the Joint Range and Speed Estimation Meth...

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

作者： Sapronov, D.I. Kamenskiy, I.V. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9781728147727

This article uses the previously presented method [1] of joint estimation of range and radial velocity in short-range radars using one ultra-wideband signal with discrete frequency coded waveform (DFCW). The core of the method is the use of the expression of the two-dimensional digital compression function of the output of the radar receiver ADC. The results of the practical implementation of this method are presented in a radar with a generation circuit using a phase-locked loop (PLL) generator, direct digital synthesis generator (DDS) and a quadrature modulator (IQ modulator). The results of the method are compared for signals with linear and pseudo-random frequency codes. The results of the method after using the calibration algorithm are presented. © 2020 IEEE.

关键词： Radar receivers

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Comparison of Energy Metrics and Levels of Passive Interference for UWB Radars With Radio and Video Pulse Probing signals

Comparison of Energy Metrics and Levels of Passive Interfere...

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

作者： V. N. Skosyrev V. M. Nuzhdin P. V. Sokolov A. N. Kharlamov Moscow State Technical University named after N.E. Bauman (National Research University) Moscow Russia Moscow Aviation Institute (National Research University) Moscow Russia

signals properties comparative analysis is carried out for ultra-wideband pulse radar probing signals, which have equal spatial resolution and duration, but differ by presence or absence of high frequency filling. The broadband factor is used, defined as the relation of the probing signal bandwidth to its spectrum average frequency. Signal-to-noise and signal-to-passive interference ratios dependences on the broadband coefficient are obtained. It is shown that for the same antenna system aperture, dimensions and radiation power, the signal-to-noise ratio in a radar with a radio-pulse probing signal will be higher. That benefit is inversely proportional to the broadband factor square. Assuming that the passive interference level is proportional to the selection element area, its estimation is obtained. It is shown that when the spectral bands of ultrashort video and radio pulse probing signals are equal, the pulse with high-frequency filling has an advantage, in terms of the considered parameters.

关键词： Airborne radar Interference Radar antennas Filling Broadband communication Broadband antennas Optical pulse generation

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Adaptive Compensation for Interference under Radio signals Reception by the Multibeam Antenna System

Adaptive Compensation for Interference under Radio Signals R...

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

作者： Vorontsov, A.P. Maslov, M. Yu Bosomykin, D.V. Gavrilov, A.A. Federal State Unitary Enterprise Radio Research Development Institute FSUE NIIR Moscow Russia Head of the Center Samara Branch Federal State Unitary Enterprise Radio Research Development Institute FSUE NIIR Moscow Russia

ISBN: (纸本)9781728147727

The concept of organizing interference compensation when receiving a radio signal by the multipath antenna system is considered. Methods for improving the quality of radio signal reception in a complex interference environment with the definition of a promising method for use are considered and analyzed. Schemes for constructing a dish antenna system of a compensation antenna with the development of recommendations for construction are considered and analyzed. Variants of technical solutions for creating a broadband antenna feed are considered, an analysis of the results is carried out, and proposals for further research are formulated. © 2020 IEEE.

关键词： Antenna feeders

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Features of Capacity of Communication Channel with APSK-N signals, which Implements the Theory of Resolution Time

Features of Capacity of Communication Channel with APSK-N si...

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

作者： Lerner, I.M. Manerov, M.A. Fayzullin, R.R. Chernyvskii, S.M. Il'in, V.I. Kazan National Research Technical University N.a. A.N. Tupolev - KAI Kazan Russia Kazan Volga Region Federal University Kazan Russia

ISBN: (数字)9781728147727

ISBN: (纸本)9781728147727

The paper analyzes the features that arise in the process of information transmition using a multi-position amplitude-phase-shift signal with N discrete states through a nonparametric, frequency-selective communication channel with intersymbol interference. We consider a class of channels utilizing the theory of resolution time. The greatest attention is paid to a study of properties of 'transparency windows' in the presence of adverse factors such as frequency detuning and envelope and phase measurement errors introduced by the receiving device. Due to the obtained results recommendations are made to increase the speed in such communication channels. © 2020 IEEE.

关键词： Phase shift keying

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Detection of signals with a Random Moment of Occurrence Using the Cumulative Sum Algorithm

Detection of Signals with a Random Moment of Occurrence Usin...

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

作者： V. I. Volovach V. M. Artyushenko Volga Region State University of Service Togliatty Russia Technological University Korolev Russia

A method for detecting signals with a random moment of occurrence based on the algorithm of cumulative sums with a reflecting screen under the influence of non-Gaussian noise is presented. An example of detecting a signal exposed to non-Gaussian quasi-deterministic additive noise is used for obtaining the dependences of the probability of false detection on the value of the signal-to-noise ratio for different values of the detection threshold. An increase in the detection threshold value, as well as the value of the signal-to-noise ratio, leads to a decrease in the probability of false detection. It is shown that the case of coordinated noise has the highest probability of correct detection. The algorithm for detecting a signal against the background of pulse noise and fluctuating non-Gaussian noise is analyzed and curves for probability of correct detection are obtained. It is found that the mismatch of the cumulative sum algorithm and the real density of probability distribution of noise leads to a decrease in the probability of correct detection. It is shown that the cumulative sum algorithm allows not only to solve the problem of detecting a signal in real time, but is also simple enough to be used when solving some practical problems.

关键词： Additive noise Additives Real-time systems Probability distribution Signal detection Signal to noise ratio

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The Research of Digital Antenna Arrays with Directive Radiators for Interference and Noise Cancellation in Azimuth and Elevation

The Research of Digital Antenna Arrays with Directive Radiat...

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

作者： I. W. Peshkov I. N. Zaitseva N. A. Fortunova Yu. B. Nechaev Bunin Yelets State University Yelets Russia Voronezh State University Voronezh Russia

In the paper the problem of applying the digital antenna arrays (DAA) equipped with the directional radiators is considered simultaneously on azimuth and elevation planes. The method MUSIC of direction-of-arrival (DOA) estimation is researched depending on the shape of the antenna array and the directivity of an individual element. The half-dodecahedron, planar and cylindrical antenna arrays are considered. As it is well known along with DOA-estimation as the first step the beamforming is highly needed at the final stage of the digital arrays functionality. The optimal algorithm of maximizing the ratio of the useful signal to interference + noise (SNIR) is researched in the tasks of the radiation pattern formation simultaneously on azimuth and elevation planes. The estimations of the signal to noise and interference ratio as well as bit error rate (BER) are obtained depending on the directivity of the emitters. The research has established that the shape of the radiation pattern of elements has a significant impact on both the accuracy of bearings and placing the main lobe and zeros. The curves are provided showing the optimal performance of DAA on azimuth and elevation planes.

关键词： field emitter arrays Array signal processing Azimuth Shape Bit error rate Estimation Interference

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Research of the Influence of Nonlinearity of Capacitance-Voltage Characteristics of field-Effect Transistors on Nonlinear Distortions in Distributed Amplifiers

Research of the Influence of Nonlinearity of Capacitance-Vol...

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

作者： R. Y. Ivanyushkin N. D. Shmakov Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781665415484;9781665446983

The model of distributed power amplifier, built on field-effect transistors of model MRF 9045, is presented. AM -AM characteristic and AM - PM characteristic investigated on the basis of this amplifier circuit are presented. The construction of a distributed power amplifier circuit for simplified modeling of parametric nonlinear distortion is discussed. Simplified models of this type of amplifiers for the HF and UHF ranges are given. In a simplified model for the HF range, the parametric capacitances are built on the basis of the capacitance-voltage characteristics on the field-effect transistor of model BLF 278. In the simplified model for the UHF range, the parametric capacitances are built on the basis of the capacitance-voltage characteristics on the field-effect transistor of model MRF 9045. The features of constructing a simplified model of a distributed gain amplifier are discussed. On the basis of simplified models of parametric nonlinear distortion amplifiers, several cases of the influence of parametric capacitances are investigated such as: the influence of the input parametric capacitance, as well as the influence of the output parametric capacitance. The result of the research is the amplitude and phase-amplitude characteristics. The reasons for parametric nonlinear distortions and methods of their linearization are discussed. Further research tasks are presented.

关键词： Distributed amplifiers Capacitance-voltage characteristics Nonlinear distortion Current-voltage characteristics Power amplifiers Hafnium Capacitance

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