CHARACTERISTICS OF MATHEMATICAL SOFTWARE RADIO COMMUNICATION
T.V. Glotova, H.I.Besher
This paper discusses the features of the methods used to assess the propagation characteristics of radio waves in modern radio systems. Parameters affecting the accuracy and the computation time of radio signal propagation in certain areas. It is noted, as a preliminary evaluation of the characteristics as there is a large error in calculations, the use of statistical approaches. More acceptable from the point of view of practical use give radiation methods, different variants of which is given. It is noted the feasibility of a combination of several methods, such as adding to the main model approaches based on artificial intelligence.
Keywords: radio communications, wave propagation, mathematical software, method, design.
THE MODELING OF THE DETECTION OF WEAPONS ON THE HUMAN BODY BY PULSED IRRADIATION
D.A. Serdyutskaya, A.A.Maximova
The possibilities of detection and identification of metal items and especially weapons, with the size of the order of one to two decimeters, which are hidden on human body, based on the use of phased array antenna, which includes ultra-wideband transceivers are considered. Through the use of UWB-signals the excitation of oscillations at the resonant frequencies, and especially at the main resonance, that defines a clear object selection. Broadband irradiation object of microwave signal in the corresponding frequency range is several hundred MHz, leads to the occurrence of low-frequency resonances and delay response for the receiver when using phased arrays for imaging radio images. Further processing of the reflected signal includes the classification of a hidden object based on the respective resonance frequencies, which allows to distinguish the guns and knives from useful items such as mobile phones and cameras.
Keywords: impulse, scattering of electromagnetic waves, safety, identification of objects.
MODELING OF ELECTROMAGNETIC WAVE SCATTERING BASED ON THE COMBINED METHOD IN URBAN AREAS
V.G. Panarin, A.G.Yurochkin
The paper discusses a combined model of electromagnetic wave diffraction by buildings in urban areas, is based on the uniform theory of diffraction. It is known that there are problems when using the uniform theory of diffraction for areas in which there is a large number of wedges. In the present work is the consideration of the members of the high-order diffracted field, giving opportunities for more accurate results, that is, using a combined model with physical optics and uniform theory of diffraction. Such models may find applications in the development of theoretical models to predict more accurate way signal loss in urban environments when considering the propagation in several buildings.
Keywords: radiowave propagation, diffraction theory, electromagnetic field, physical optics.
THE RESEARCH OF FEATURES OF DIFFRACTION PROCESSES IN THE HIGH FREQUENCY RANGE
V.G. Panarin, A.G.Yurochkin
This paper discusses the features of processes of diffraction of electromagnetic waves in the high frequency range as it is promising from the point of view of further development of communication systems. It is noted that with the increase in frequency is required to consider the objects surface on which the diffraction as rough. The numerical simulation is introduced the Fresnel’s coefficient of roughness. This description of the reflection coefficients taking into account the surface roughness. Given the calculated reflection coefficients for different polarizations of the incident electromagnetic wave depending on frequency. The dependence of the reflection coefficient depending on angle of incidence for a given frequency of the incident electromagnetic wave.
Keywords: diffraction, electromagnetic waves, reflection coefficient, Fresnel’s coefficient.
MODELING OF SCATTERING OF ELECTROMAGNETIC WAVES ON THE ELECTROMAGNETIC OBJECTS USING THE MODIFIED METHOD OF MOMENTS
In the paper the approach is discussed to the solution of problems related to scattering of electromagnetic waves on objects of large dimensions based on the combination of surface integral equations and the method of moments. We apply basic and trial functions in the method of moments in the process of information integral equations to a system of linear equations for the case when the matrix of impedances is very full. The wavelet transform is used in order to simplify the matrix. A comparison of results obtained based on this approach and other methods achieved their satisfactory coincidence is carried out.
Keywords: integral equations, method of moments, wavelet transform, scattering of electromagnetic waves.
SIMULATION OF SCATTERING OF ELECTROMAGNETIC WAVES ON THE OBJECT WITH AN UNEVEN SURFACE
Using the method of moments considers the processes of scattering of electromagnetic waves from perfectly conducting object located above a rough surface is carried out. The pattern of changes in the profile of a rough surface obeys a Gaussian distribution is considered. An approach based on the procedures of Monte Carlo simulation in order to carry out calculation functions, angular correlations, which depends on the distance from the surface of the object is used, its size and its position relative to the horizontal. Change the value of this function can be used to refine the position of an object. The analysis of the statistical characteristics from the point of view of object detection is carried out.
Keywords: electromagnetic wave scattering, rough surface, integral equations.
THE DEVELOPMENT SIMULATION MODELS OF RATIONAL ROUTE SYSTEM
T.E. Grigorieva, E.V. Istigecheva
Simulation models of bus routes are developed for the purpose of minimization expenses and spending resources rational of a car park. For this purpose the basic principles and criteria of a route technology are considered, the generalized model of bus routes is given. Modeling is carried out in the modeling environment MARS. The MARS allows varying such the parameters as: a time frame of work the researched system; the number buses appointed to the certain flight; time which the bus spends at stops, gas stations, etc..
Keywords: modeling, route, optimal routing system, model of bus routes.
THE SIMULATION OF RADIO WAVE SCATTERING ON TWO DIMENSIONAL CYLINDERS
V.N. Kostrova, E.A.Rybalchenko
We apply principles of superposition for analysis of normal of plane waves incident on an infinitely long conducting or dielectric circular cylinders with multilayer coatings made of materials with magneto-minimize or maximize the radar cross section (RCS). We consider the case of TE and TM polarizations of the incident wave. Optimization of RCS by the method of least squares leads to the determination of layer thickness and material with the complex values of the magnetic and dielectric permeability is carried out. Also the analysis of sensitivity of RCS with given geometric parameters and material parameters for a conducting cylinder coated with a magneto is given.
Keywords: communication, electromagnetic wave scattering, integral equations, cylinder.
THE METHODS OF PROCESSING MEDICAL DATA
In the paper we shall review the possibility of building an outsourcing company that is associated with the processing of sound and radio signals. The analysis of outsourcing types is given. The main problems that arise when developing governance structures in the company are shown, the analysis of the characteristics of the forms of control are considered: the linear organizational structure, functional organization structure, functional linear structure, linear organizational structure, with functions cross-divisional management structure and organizational structure by region, product structure, organizational structure focused on the consumer. The scheme of an outsourcing company for processing audio and radio signals is given.
Keywords: sound signals, radio signals, outsourcing, company, organization.
MARKOV MODELS OF THE QUANTIZED SPEECH SIGNALS
K.P. Pletnyov, D.E. Prozorov
The article considers Markov models of the quantized speech signals (QSS). It is shown that correlation properties of the bit sequences obtained by the quantization of speech signals, allow it to apply the mathematical apparatus of simple or complex (multiply connected) finite Markov chains for the statistical description of the QSS. The method of parameterization based on Markov models of QSS reduces the performance requirements of systems of automatic speech recognition.
Keywords: Markov models of speech signals, Markov chains, parametrization.