Rapid calculation method of radar scattering cross section of hypersonic speed aircraft

Abstract

The invention provides a rapid calculation method of the radar scattering cross section of a hypersonic speed aircraft. The method comprises that S1) on the basis of distribution characteristic of surrounding plasmas in the moving state of the aircraft, a physical field parameter including the plasma electron density and collision frequency and based on plasma flow field data is extracted; S2) a calculation area is divided according to grids, and on the basis of discrete information, a spectral function distribution model corresponding to a corresponding motion state is obtained; S3) the corresponding radar scattering cross section is solved on the basis of the physical field parameter of plasma flow field data distribution; and S4) different incident angles are set, and the radar scattering cross sections of different azimuths are obtained according to the divided grid information. The method has the advantages of being simple, rapid and equivalent.

Description

technical field [0001] The invention relates to the technical field of solving radar scattering cross sections, in particular to a method for quickly calculating radar scattering cross sections of hypersonic aircraft. Background technique [0002] When a re-entry or near-space hypersonic stealth vehicle flies in the atmosphere, plasma flow and wake will be formed, which will seriously affect the electromagnetic scattering characteristics of the vehicle, so that the near-space hypersonic vehicle behaves differently from conventional aircraft in the atmosphere and outside the atmosphere. The obvious difference in the electromagnetic scattering characteristics of the orbiter brings new challenges to the detection and tracking of the aircraft (A.H.Richard. The application of light gas gun facilities for hyper-velocity aerophysics research[R].AIAA92-98.). When an ultra-high-speed aircraft flies close to space, the surrounding air is compressed sharply, the aircraft and the air ar...

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Problems solved by technology

The three methods have their own advantages and disadvantages. The precise analytical method is the most accurate, but it can only be solved for a limited shape.

[0005] Generally speaking, the research on the similarity of the RCS characteristics of sub-density turbulent wakes of hypersonic vehicles is a very difficult problem. There has not been any research in this area in China, and there are no ready-made theories in the published literature abroad.

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