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 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 PREDICTION OF THE SCATTERING CHARACTERISTICS OF METAL PYRAMIDS IN THE FREQUENCY RANGE BASED ON THE USE OF GENETIC ALGORITHM
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.
ABOUT THE USING OF INTEGRAL EQUATIONS IN THE SOLUTION OF ELECTRODYNAMIC PROBLEMS
The analysis of characteristics of integral equations is carried out. The possible methods of their solution. the methods is considered. The possibility of using integral equations is indicated in the solution of electrodynamic problems.
Keywords: integral equations, electromagnetic wave, scattering.
THE SOLUTION OF THE PROBLEM OF SCATTERING OF ELECTROMAGNETIC WAVES ON THE METAL CYLINDER IN THE EARTH COVER
The scatters of electromagnetic waves that are in the dielectric environment have broad practical application. For example, when modeling the scattering of electromagnetic waves on cylindrical object in an earth cover we can use these results at remote sensing of pipes and cables. In paper some results within the considered model are received.
Keywords: : scattering of waves, integral equations, electromagnetic wave.
THE APPROACHES FOR ESTIMATION OF SCATTERING CHARACTERISTICS OF ELECTROMAGNETIC WAVES
A.V. Danilova, A.G.Yurochkin
The paper is devoted to the analysis of approaches within which carry out an estimation of scattering characteristics of electromagnetic waves. The features of practical use of approaches depending on a form of the studied objects, their sizes in relation to wavelength are noted.
Keywords: : scattering of waves, integral equations, electromagnetic wave, Maxwells equations.