A special transmission characteristic of the electromagnetic wave in the plasma sheath surrounding a near-space vehicle and its analysis

2016 ◽  
Author(s):  
Yang Xin ◽  
Wei Bing ◽  
Wang Qian
Keyword(s):  
Electromagnetic Wave ◽  
Space Vehicle ◽  
Plasma Sheath ◽  
Transmission Characteristic ◽  
Its Analysis ◽  
Near Space

SCATTERING FROM A CYLINDER COATED WITH AN INHOMOGENEOUS DIELECTRIC SHEATH

1963 ◽  
Vol 41 (1) ◽  
pp. 143-151 ◽  
Author(s):  
C. Yeh ◽  
Z. A. Kaprielian
Keyword(s):  
Dielectric Constant ◽  
Scattering Problem ◽  
Plane Waves ◽  
Space Vehicle ◽  
Plasma Sheath ◽  
Scattering Coefficients ◽  
Average Value ◽  
Inhomogeneous Dielectric ◽  
Specific Variation ◽  
Plane Wave Scattering

As a space vehicle re-enters the atmosphere, a plasma sheath, surrounding the vehicle, is generated. It is well known that the sheath is inhomogeneous. However, to make this problem suitable for theoretical analysis, most investigators make the assumption that the sheath is homogeneous. To investigate the validity of this assumption, the idealized problem of the scattering of plane waves by a conducting cylinder coated with a stratified dielectric sheath is considered. The wave equation is separated using the vector wave-function method of Hansen and Stratton. It is then applied to the plane-wave scattering problem. The backscattering cross section is defined and obtained. Analytical expressions for the scattering coefficients of a thin inhomogeneous sheath are also given. Numerical computations are carried out for a specific variation of the dielectric sheath: i.e., ε(r) = ε0α/k0r, where α is a constant, k02 = ε2 με0, and ε0 is the free-space dielectric constant. Results are compared with the homogeneous sheath problem; the dielectric constant of the homogeneous sheath is taken to be the average value of that for the inhomogeneous sheath. It is found that in general rather distinct differences are observed except when the sheath is very thin.

PI Predictive Functional Attitude Control of Near Space Vehicle

2015 ◽  
Vol 8 (8) ◽  
pp. 409-424 ◽  
Author(s):  
Zhenyu Lu ◽  
Kai Li ◽  
Tingya Yang ◽  
Wei Guo ◽  
Jin Wang
Keyword(s):  
Attitude Control ◽  
Space Vehicle ◽  
Near Space

Research of De-Couple Control System for near Space Vehicle with High Maneuver and Couple

2011 ◽  
Vol 128-129 ◽  
pp. 979-984
Author(s):  
Shao Bo Ni ◽  
Wei Jun Hu ◽  
Song Xiong
Keyword(s):  
Control Method ◽  
Space Vehicle ◽  
Parameter Method ◽  
Control Law ◽  
Time Varying ◽  
Information Feedback ◽  
Control Loops ◽  
Near Space ◽  
Non Linear ◽  
Result Show

A de-couple control method with information feedback from other control channel and a method with double control loops were present for the hypersonic vehicle with non-linear, couple and lateral maneuver. The whole controller was divided into two parts: the computation of actuator which deal with control couple and design of control law which solve the problem of movement and aerodynamic couple. The time-varying controller parameter method and robust control law were present to solve the problem of quick time-varying model parameter and non-linear. Finally these two methods were analyzed contrastively; the simulation result show that these two methods present above can achieve the quick dynamic and high precise track of command. But the latter was better.

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