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Fast calculation method for dynamic plasma sheath radio wave propagation

A technology of plasma sheath and electric wave propagation, applied in the field of calculation of ion sheath electric wave propagation

Active Publication Date: 2016-01-20
XIDIAN UNIV
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Problems solved by technology

[0004] Aiming at the problem of dynamic plasma sheath electric wave propagation of hypersonic aircraft, the present invention proposes a fast dynamic plasma sheath electric wave propagation calculation method, which starts from the physical mechanism of electron density change speed and establishes a mathematical model of dynamic plasma sheath electron density , and on this basis, the quasi-steady-state Monte Carlo method and classical electromagnetic calculation method are used to obtain the time-varying field strength results of radio wave propagation in this complex randomly changing medium

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  • Fast calculation method for dynamic plasma sheath radio wave propagation
  • Fast calculation method for dynamic plasma sheath radio wave propagation
  • Fast calculation method for dynamic plasma sheath radio wave propagation

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[0055] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution, and provides detailed implementation and specific operation process, but the protection scope of the present invention is not limited to the present invention. Example.

[0056] Such as figure 1 As shown, a fast plasma sheath electric wave propagation calculation method includes the following steps:

[0057] S101 input T 0 The mathematical model of electron density in the dynamic plasma sheath is established based on the time-inhomogeneous electron density distribution function, the variation law of the angle of attack, and the jitter variance.

[0058] S1.1: Input T 0 Inhomogeneous steady-state electron density at plasma height and velocity at time Such as figure 2 As shown, the collision frequency Constant = 2G, means T 0 time The electron density at a distance z from the surface ...

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Abstract

The invention discloses a fast calculation method for dynamic plasma sheath radio wave propagation. The method comprises the following steps of establishing a mathematical model of a dynamic plasma sheath electron density based on a physical mechanism of the change speed of the electron density; then adopting a quasi-steady-state monte carlo method and a classical electromagnetic computing method on this basis to acquire a time-varying field intensity result of radio wave propagation of this complex random change medium. The invention is a simple, effective and fast radio wave calculation method, and can solve the radio wave propagation calculation of the dynamic plasma and avoid the high difficulty and high complexity by directly using a random medium modeling method to calculate.

Description

technical field [0001] The invention relates to the field of radio wave propagation, in particular to a calculation method for radio wave propagation of a dynamic plasma sheath. Background technique [0002] During hypersonic flight, a layer of high-temperature thermogenic plasma will be wrapped around the aircraft, which is 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, and in severe cases, interruption of communication signals (black barrier phenomenon). The research on the radio wave propagation in the plasma sheath is very important to the design of the measurement and control communication system of hypersonic vehicles. [0003] The traditional calculation of electric wave propagation in the plasma sheath (body) is mostly aimed at the steady-state plasma, and the classic methods are the time-domain finite difference method, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 石磊姚博李小平杨敏刘彦明
Owner XIDIAN UNIV
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