Category Archives: Issue # 2(13)

THE SIMULATION OF RADIO WAVE PROPAGATION INDOORS

UDC 621.396

P. S. Ryzhenin

The analysis of such methods, based on which we can assess the level of electromagnetic fields inside premises. It is shown that on the basis of the deterministic methods achieve a higher accuracy of calculations of scattering characteristics of radio waves, when compared with statistical approaches. Occurs building the tree of beam propagation, while fundamentally we see the beam coming from the transmitting device and each point of reflection or diffraction are generated by the additional rays. When multipath propagation of the signal we are seeing some of the most significant effects: fading, time dispersion, the angular modulated carrier. The model rectangular space, which is calculated in the framework of the ray method.

Keywords: ray method, wave propagation, wireless communication, computer networks, antenna.

Full text:
Rizhenin_2_16_1.pdf

THE CONSTRUCTION OF THE AUTOMATED WORKPLACE OF THE DOCTOR-PSYCHIATRIST

UDC 616.053

D. S. Korovin

This paper involves the study and creation of automated work places of a psychiatrist. We assume that processing occurs a local, fairly complete and largely complete information on the different levels of the hierarchy. The program allows to maximally reduce the time of formation: construction, installation, inspection, diaries, since the establishment of the text is with the mouse, eliminating the repetitive input of information from the keyboard; to implement a convenient and quick work with the patient database and archives; conduct a rapid formation and reporting of medical records. The scheme of movement of information flows to the arm of the doctor is described.

Keywords: automated workstation, a psychiatrist, programming, health care.

Full text:
Korovin_2_16_1.pdf

THE SOLUTION OF THE PROBLEM OF SCATTERING OF ELECTROMAGNETIC WAVES IN MAGNETO-DIELECTRIC OBJECT BASED ON THE ADAPTIVE METHOD

UDC 621.396

T. V. Glotova, T.V.Melnikova

This paper discusses how adaptive integral method for solving the problem of scattering of electromagnetic waves on the object, which consists of several magneto-dielectric materials can be used. The integral equation to be solved with the help of this approach helps to eliminate resonance phenomena in dielectrics, and to obtain very accurate results. The method of moments is applied in order to carry out the process of discretization of integral equations is given and the resulting matrix system which is solved based on the iterative approach. As a result, the memory requirements is reduced to store intermediate results and to speed up matrix-vector multiplications. Numerical results that illustrate the accuracy and efficiency of this method are given.

Keywords: scattering of radio waves, method of moments, integral equation, magneto-dielectric materials, algorithm.

Full text:
GlotovaMelnikova_2_16_2.pdf

THE MODIFICATION OF THE METHOD OF MOMENTS IN THE SCATTERING OF ELECTROMAGNETIC WAVES

UDC 621.396

T. V. Glotova, T.V.Melnikova

The features of the solution of the integral equations used in the solution of problems of scattering of electromagnetic waves are discussed. The main methods that used are noted. It is proposed to modify the usual method of moments, due to the choice of basis and test functions. Examples of test objects used for the calculations are given. It was found that the more complex the contour of the object, the worse the condition number of linear equations. That is, the scale of the investigated basis functions may not be large. It is shown that if the solution of the integral equation is almost a linear function, the size of the linear equations can be significantly reduced compared to the original.

Keywords: technical electrodynamics, the scattering of radio waves, method of moments, integral equation, numerical method.

Full text:
GlotovaMelnikova_2_16_1.pdf

THE POSSIBILITY OF USING ITERATIVE METHOD FOR THE CALCULATIONS OF SCATTERING CHARACTERISTICS OF COMBINED OBJECTS

UDC 621.396

A. G. Yurochkin, A.V.Danilova, I.A.Gusarova

This paper considers the scattering of radio waves on the combined object consisting of several components. One of the possible ways, which is analyzed by the application of the method of integral equations. But with a large size of circuits and an increase in the number of components the time required for calculations increases significantly. In this regard, the iterative method is considered, which takes into account only the currents that are related directly to the reflection between components, which leads to a reduction in the size of the matrix of linear equations and an overall reduction in the computation time. Given an example, when as a combined object is a combination of two-dimensional elliptic cylinders. Characteristic size at which the iterative method works well.

Keywords: communication, diffraction, wave propagation, method of integral equations, iteration, cylinder.

Full text:
YurochkinDanilovaGusarova_2_16_2.pdf

THE ANALYSIS OF APPROXIMATE MODELS FOR ESTIMATING THE AVERAGE CHARACTERISTICS OF THE SCATTERING DIFFRACTIVE STRUCTURE

UDC 621.396

A. G. Yurochkin, A.V.Danilova, I.A.Gusarova

This paper analyses the possibilities of how to apply the approximate model in order to assess the average characteristics of the scattering object. The exact approach is based on the method of integral equations, and an approximate model based on the combination of the method of edge waves and the physical optics approximation. The object is represented in the form of separate components. It is shown how the defined sector angles, given the framework of specific errors. Based on how aggregated information on the elements of an object given suggestions on how to build a subsystem of CAD in order to design the average characteristics of the objects. As a test data for the subsystem are selected dimensions of the elements and sector angles, the required levels for the average characteristics of the scattering.

Keywords: communication, diffraction, wave propagation, design, CAD, diffraction structure.

Full text:
YurochkinDanilovaGusarova_2_16_1.pdf

THE PREDICTION OF THE SCATTERING CHARACTERISTICS OF METAL PYRAMIDS IN THE FREQUENCY RANGE BASED ON THE USE OF GENETIC ALGORITHM

UDC 621.396

A. A. Maksimova, V. N. Kostrova, A. A. Androsov

The analysis model of prediction of radar characteristics is conducting pyramid in the frequency range on the basis of experimental evidence, what is its scattering properties is given. For the case of a vertically incident plane electromagnetic wave using the method of integral equations by numerical way, the calculation of the angular dependences for radar cross section of the pyramid, as well as with the involvement of a genetic algorithm made a prediction of RCS for the specified object in the frequency range is carried out.

Keywords: communication, radio waves, forecasting, optimization, genetic algorithm, integral equations, objects with complex shape.

Full text:
MaximovaKostrovaAndrosov_2_16_2.pdf

OPTIMIZATION OF WIRELESS COMMUNICATION NETWORKS BASED ON ARTIFICIAL INTELLIGENCE METHODS

UDC 621.396

A. A. Maksimova, V. N. Kostrova, A. A. Androsov

The analysis of the approaches designed for the estimation of scattering characteristics of diffractive structures and parameters of wireless communication systems is given. The possibility of optimizing wireless communication systems in the room based on artificial intelligence methods (genetic algorithm) is considered. As the main calculation method is proposed to use the ray-tracing method and an optimization technique – genetic algorithm. In a genetic algorithm it is proposed to use single point crossing-over, defined by its steps. As chromosomes the coordinates of the mesh around the point observations made at a given step are considered. A combined algorithm of calculating the optimal location of access points inside the building is proposed. The results of pre-test calculations are recorded.

Keywords: wireless communication, optimization, communication, radiowave propagation, ray method.

Full text:
MaximovaKostrovaAndrosov_2_16_1.pdf

IMPROVED PERFORMANCE DEVICES ANALOG-RECEPTION AND PROCESSING OF SIGNALS BROADBAND COMPLEXES DIRECTION FINDING

UDC 621.391

O.I. Bokova, D.A. Zhayvoronok, O.S. Slastnikova

The article deals with topical issues of today use analog-to-digital receiving and processing devices (ATSPO) radio signals to control congestion of the frequency spectrum, the detection and analysis of new emissions, determining the location of their sources, as well as identifying unintended or specially organized channels of information leakage. To improve the effectiveness of the proposed ATSPO provide frequency agility operating range station, without derating transceiver operation. In particular, the provision of specific dynamic and spectral characteristics, receives by constructing a tandem digital frequency synthesizer (TSSCH). In computer design stations developed the concept of the two ring TSSCH with automatic compensation of frequency distortion on modern element base. In addition, the analysis of amplitude-frequency modulation characteristics of the proposed scheme, as well as the analysis of the reaction of the proposed scheme in the parasitic increment the reference oscillation phase. We obtain the modulation transfer function of the proposed scheme and the defined conditions of sustainability of the angle modulation. Thus, the use of two digital frequency synthesizer annular in design decision error-correcting transceiver provides frequency agility over the operating range of wavelengths with angle modulation, without impairing its essential characteristics.

Keywords: frequency synthesizer, pulse-phase-locked-often you, frequency grid, speed.

Full text:
BokovaZhayvoronokSlastnikova_2_16_1.pdf

PLANNING OF TERRESTRIAL WIRELESS COMMUNICATION THROUGH
SPECIALIZED SOFTWARE

UDC 621.396

O.I. Bokova, S.V. Kanavin, N.S. Khokhlov

The article discusses the features of the design of terrestrial radio transmission of information using specialized software systems “Zone – Mobile radio” and “territory”. The possibilities of their use for the calculation of quality indicators and radio frequency-spatial planning of mobile radio networks.

Keywords: software engineering systems, frequency planning, mobile radio.

Full text:
BokovaHohlovKanavin_2_16_1.pdf