scholarly journals Modelling of the reflectance profile of axisymmetrical radiolocation objects using the integral equation method

2021 ◽  
pp. 76-93
Author(s):  
A. A. Runov
Keyword(s):  
Integral Equation ◽  
Stable Solution ◽  
Integral Equation Method ◽  
Equation Method ◽  
Accuracy Evaluation ◽  
Approximation Accuracy ◽  
Bodies Of Revolution ◽  
The Matrix ◽  
Method Of Solution ◽  
Ring Source

Based on the first-kind integral equation method for the electric field, the procedure and software for calculating the radar cross-section of axisymmetrical objects, bodies of revolution, are developed. Algorithms are proposed for computation of the matrix of mutual impedances and Green's function of a ring source providing the computation accuracy required for obtaining a stable solution. The method of solution approximation accuracy evaluation by azimuthal harmonics is proposed. Comparison with test examples is carried out and the applicability for solving real-world problems is shown.

scholarly journals Approximate and strict methods for the calculation of rode angle antennas of microwave range

2018 ◽  
Vol 26 (1) ◽  
pp. 83-88
Author(s):  
V. V. Ovsyanikov ◽  
D. M. Svynarenko ◽  
E. R. Beznosova ◽  
L. Z. Tsipko
Keyword(s):  
Integral Equation ◽  
Stable Solution ◽  
Initial Approximation ◽  
Integral Equation Method ◽  
Microwave Range ◽  
Electrical Parameters ◽  
Approximate Methods ◽  
Long Line ◽  
The Matrix ◽  
Curved Rod

Approximate and rigorous methods and results of calculations of electrical characteristics of rod arbitrarily curved antennas of the microwave range are investigated with the purpose of widening their varieties and increasing the accuracy of calculations of electrical parameters. An approximate calculation of the antennas is performed by the equivalent long line method, rigorous – by the integral equation method with respect to the distribution of the complex current at the antenna. An algorithm for the step-by-step development of curved rod antennas with included various concentrated loads and excitation nodes at arbitrary points are proposed. It is concluded that approximate methods are useful for a preliminary rough estimate of the input parameters of the antennas, and also as an initial approximation for their parametric synthesis and analysis. But strict methods can significantly expand the variety of studied antennas and improve the accuracy of calculations of their electrical parameters. A method is proposed for obtaining a stable solution of an integral equation by diagonalizing the matrix of coefficients of a system of equations. Basing on the results of the investigation of these antennas, new designs have been developed, a number of which have been introduced into production and operation. It is noted that for the first time in world practice the method of an integral equation described in this article for calculating such antennas has outpaced the development of known analogous methods and corresponding computer programs.

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