Simulation method of radial time-varying electron density in plasma sheath of high-speed aircraft

Abstract

The invention belongs to the technical field of aerospace measurement and control communication, and discloses a radial time-varying electron density simulation method of a plasma sheath of a high-speed aircraft, comprising: generating a steady-state electron density according to the steady-state electron density obeying a double Gaussian distribution in the radial direction of the aircraft; The expected frequency response matrix of the two-dimensional filter is obtained from the power spectral density of the time-varying electron density; the two-dimensional Gaussian window function is generated, and the expected frequency response matrix of the two-dimensional filter is processed with a window function to obtain the amplitude-frequency response of the two-dimensional filter; The two-dimensional Gaussian white noise is filtered by a two-dimensional filter to obtain the time-varying offset of the radial electron density of the high-speed aircraft plasma sheath that meets the requirements of the probability density function and power spectral density, and superimposed with the steady-state electron density to obtain Time-varying plasma sheath electron density sequences. The invention avoids the high difficulty and high complexity of directly modeling the two-dimensional electron density; avoids the electromagnetic calculation error caused by the error of the medium model.

Description

Technical field[0001]The invention belongs to the technical field of aerospace measurement and control communication, and particularly relates to a radial time-varying electron density simulation method of a plasma sheath of a high-speed aircraft.Background technique[0002]When a high-speed aircraft reenters the atmosphere at a speed greater than Mach 10, a shock wave is formed on the surface of the aircraft, which converts a large amount of kinetic energy of the high-speed aircraft into heat energy. The air molecules near the surface are ionized by high temperature, which will produce a layer of plasma covering the surface of the aircraft. The body sheath layer, the sheath layer will attenuate the measurement and control signal, and will cause communication interruption in severe cases. The primary parameter of plasma is electron density, which is directly related to the dielectric constant of the plasma. Therefore, modeling the electron density of the plasma sheath is the basis for...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the time item is added to the plasma sheath model at present, and the established model is too simple, which is difficult to meet the communication problems caused by the plasma sheath.

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