Method for obtaining electrically large target broadband RCS based on ACA and CAT

Abstract

The invention discloses a method for acquiring broadband RCS of an electrically large target based on ACA and CAT. The method comprises the following steps: 1) subdividing the surface of the electrically large target; 2) defining an RWG primary function on the subdivided target surface; 3) grouping the RWG primary functions of the surface of the electrically large target; 4) dividing the impedance matrix into a near field block and a far field block; 5) determining a Chebyshev sampling point of the broadband; 6) respectively filling far-field blocks and near-field blocks of the impedance matrix at the sampling points; 7) filling excitation vectors of the sampling points with an incident wave electric field; 8) solving the surface induction current at each Chebyshev sampling point; 9) calculating the surface current of each frequency point in the broadband; and 10) obtaining the broadband radar scattering cross section of the electrically large-size target. On the basis of Chebyshev approximation, an adaptive crossover approximation algorithm is combined, so that the operation time is greatly shortened, and the memory demand is reduced.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic simulation, and further relates to a method based on the combination of an adaptive cross approximation method ACA (Adaptive Cross Approximation) and a Chebyshev Approximation Technology CAT (Chebyshev Approximation Technique) to obtain a target broadband radar scattering cross section RCS (Radar Cross Section). Methods. The invention can obtain the target broadband radar scattering cross section through calculation. Background technique [0002] The fundamentals of radar target detection, stealth technology and anti-stealth technology, as well as broadband and ultra-wideband radar technology, all need to analyze and calculate the broadband electromagnetic scattering characteristics of radar targets. Among them, aircraft, tanks, missiles, satellites, etc. are common detection targets. In radar detection, it is necessary to obtain the broadband electromagnetic scattering characteristics qu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a method based on ACA and CAT to obtain the broadband RCS of the electrically large-sized target, which is used to solve the problem of filling the impedance matrix caused by too many basis functions in the current solution to the broadband RCS of the electrically large-sized target. Difficult, high computer memory requirements, and the need to calculate the current waste of time for each frequency point

[0006] In order to achieve the above object, the idea of ​​the present invention is: on the basis of Chebyshev approximation, combined with an adaptive cross approximation algorithm, only the current at the Chebyshev node is calculated, so as to solve the problem of large amount of calculation and too long time consumption when calculating the current at each frequency point. question

Solve the problem that when calculating the current of each node, because the target impedance matrix is ​​too large, it is still difficult to calculate the current even after dividing the area, and the computer memory requirement is too large to obtain the broadband radar scattering cross section.

Images