ML-TDS analysis of scattering from hypersonic vehicles covered with plasma sheath

2015 ◽  
Author(s):  
Xue Niu ◽  
Zaiping Nie ◽  
Xiaofeng Que ◽  
Shiquan He
Keyword(s):  
Plasma Sheath ◽  
Hypersonic Vehicles

Plasma sheath models for electron transpiration cooling in hypersonic vehicles

2022 ◽  
Author(s):  
Rupali Sahu ◽  
Albina Tropina ◽  
Daniil Andrienko ◽  
Richard B. Miles
Keyword(s):  
Plasma Sheath ◽  
Hypersonic Vehicles ◽  
Transpiration Cooling

Beyond LOS Detection of Hypersonic Vehicles

2021 ◽  
Vol 35 (11) ◽  
pp. 1364-1365
Author(s):  
Randall Musselman ◽  
Stephan Chastain
Keyword(s):  
Hypersonic Vehicle ◽  
Plasma Sheath ◽  
Hypersonic Vehicles ◽  
Plasma Parameters

RCS modeling of a typical hypersonic vehicle and its plasma sheath was investigated. The plasma parameters were analyzed to determine which were most dominant for accurate RCS prediction. HF was determined to provide BLOS detection and good conductivity of the plasma, for optimum RCS.

An Overview of the Research of Plasma Sheath

2014 ◽  
Vol 1049-1050 ◽  
pp. 1518-1521 ◽  
Author(s):  
Liang Zhao ◽  
Wei Min Bao ◽  
Chun Ye Gong
Keyword(s):  
Monte Carlo ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Numerical Solutions ◽  
Plasma Sheath ◽  
Hypersonic Vehicles ◽  
Particle In Cell ◽  
Radio Signals ◽  
Radio Blackout ◽  
Difference Time

The plasma sheath can be regarded as a model of a phenomenon of spacecraft reentry or hypersonic vehicles and causes so called radio blackout, which interferes with radio signals. This paper gives a survey on several aspects of plasma sheath, including the characteristic of plasma sheath, experiments to deal with the blackout and numerical solutions. The numerical methods includes WKB, finite-difference time-domain method, particle-in-cell method, CFD based method and Monte Carlo method. Some discussions are also presented.

scholarly journals Unconventionally Designed Tracking Loop Adaptable to Plasma Sheath Channel for Hypersonic Vehicles

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 21
Author(s):  
Lei Shi ◽  
Shurong Yuan ◽  
Bo Yao
Keyword(s):  
Phase Fluctuation ◽  
Plasma Sheath ◽  
Statistical Characteristics ◽  
Hypersonic Vehicles ◽  
Fast Time ◽  
Time Varying ◽  
Tracking Loop ◽  
Phase Dynamics ◽  
Amplitude Attenuation ◽  
Simulation Results

An aircraft that moves through the atmosphere at hypersonic speed is covered by plasma sheath, which causes random and fast time-varying amplitude attenuation and phase fluctuation in received signals. This paper comprehensively analyzes the mechanism of the amplitude attenuation effects on a traditional phase-locked loop (PLL), which is always ignored in traditional scenarios (such as satellite telemetry and vehicle communication). Simulation results and theoretical analysis showed that traditional PLL does not work reliably for signal carrier tracking with the severe time-varying amplitude attenuation of the plasma sheath channel. In this paper, an unconventionally designed Kalman filter (KF) tracking loop that is aware of phase dynamics and amplitude attenuation fluctuation for hypersonic vehicles is proposed. To introduce time-varying amplitude attenuation into the proposed KF-based tracking loop, the amplitude attenuation is first modeled with an autoregressive model. The statistical characteristics of the amplitude and phase fluctuation are then incorporated into the state equation and observation equation. Simulation results indicate that the proposed tracking loop is stable when the signal-to-noise ratio is −10 dB with the Ka band, even in the most severe flight environment for hypersonic vehicles.

ON PLASMA SHEATH PROBLEMS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-843-C7-844
Author(s):  
J.P. J. Lafon
Keyword(s):  
Plasma Sheath
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