Simulation method for radial time-varying electron densities of plasma sheath of high-speed aircraft

Abstract

The invention belongs to the field of spaceflight test control and communication technology and discloses a simulation method for radial time-varying electron densities of a plasma sheath of a high-speed aircraft. The method comprises the steps that steady electron densities are generated according to radial obedient double-Gaussian distribution of the steady electron densities on the aircraft; an expected frequency response matrix of a two-dimensional filter is obtained through time-varying electron densities and power spectral densities; a two-dimensional Gaussian window function is generated, windowing function processing is performed on the expected frequency response matrix of the two-dimensional filter, and an amplitude-frequency response of the two-dimensional filter is obtained; and two-dimensional Gaussian white noise is generated and subjected to filtering processing through the two-dimensional filter, radial electron density time-varying offset of the plasma sheath of the high-speed aircraft with a probability density function and the power spectral densities meeting requirements is obtained, and the radial electron density time-varying offset and the steady electron densities are superposed to obtain a time-varying plasma sheath electron density sequence. Through the method, high difficulty and high complexity of direct modeling of two-dimensional electron densities are avoided; and an electromagnetic calculation error caused by a dielectric model error is avoided.

Description

technical field [0001] The invention belongs to the technical field of aerospace measurement and control communication, and in particular relates to a radial time-varying electron density simulation method of a plasma sheath of a high-speed aircraft. Background technique [0002] When the high-speed aircraft re-enters the atmosphere, when the speed is 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 body sheath layer, the sheath layer will attenuate the measurement and control signal, and in severe cases, it will cause communication interruption. The primary parameter of a plasma is the 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 studying the propagation of electromagnetic waves in the plasma. The traditional research on the propag...

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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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