Layered structure-based dynamic plasma sheath electron density modeling method

Abstract

The invention discloses a layered structure-based dynamic plasma sheath electron density modeling method. The method comprises the steps of dividing a plasma sheath into multiple layers, wherein each layer can be approximately considered to be uniform; performing modeling on time-varying electron density of each layer; and finally synthesizing a space-time electron density matrix. According to the method, a dynamic random process of electron density change is established by utilizing a classical theory, so that the difficulty in the condition that data cannot be obtained from a flight experiment is overcome; plasmas are equivalent to a layered structure, and the electron density of each layer is modeled, so that high difficulty and high complexity in direct modeling of space-time two-dimensional electron density are avoided; for dynamic plasmas in different conditions, the space-time electronic densities of the dynamic plasmas can be modeled by using a unified modeling method; and theoretical and data support is provided for research on electromagnetic wave propagation in the dynamic plasmas, influence of the dynamic plasmas on signals of different systems and the like.

Description

technical field [0001] The invention belongs to the technical field of radio wave propagation, in particular to a layered structure-based dynamic plasma sheath electron density modeling method. Background technique [0002] The surface of a hypersonic vehicle will be covered with a layer of plasma during flight, called a plasma sheath. The charged particles mainly free electrons in the sheath will absorb, reflect and scatter electromagnetic waves, causing serious attenuation of electromagnetic signals; meanwhile, the electron density changes rapidly, which in turn causes the plasma dielectric constant to change rapidly with time, making the electromagnetic The signal amplitude fluctuates wildly. Modeling the electron density of the plasma sheath is the basis for studying the propagation of electromagnetic waves in the plasma, and is crucial to the design of the measurement and control communication system for hypersonic vehicles. Traditional studies on the propagation of e...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a dynamic plasma sheath electron density modeling method based on a layered structure, aiming to solve the problem that the space-time electron density change of the dynamic plasma sheath is difficult to describe

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