A layered fluctuation model of electron density in plasma sheath and instability effect on electromagnetic wave at Ka band

Yao, Bo; Li, Xiaoping; Shi, Lei; Liu, Yanming; Bai, Bowen

doi:10.1016/j.ast.2018.05.001

Cited by 34 publications

(8 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the amplitude attenuation in the Ka band does not appear to be influenced by plasma sheath, which is approximately −20 dB, most of the time. However, in the worst circumstance under 30 km altitude [19], the calculated results show that deep fading may be −80 dB, which is caused by random time-varying turbulence even in the Ka band. Figure 2 shows the phase fluctuation of the received signal caused by plasma sheath.…”

Section: Amplitude Attenuation and Phase Fluctuation Characteristicsmentioning

confidence: 94%

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

Shi

Yuan

Yao

2020

Sensors

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Amplitude Attenuation and Phase Fluctuation Characteristicsmentioning

confidence: 94%

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

Shi

Yuan

Yao

2020

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to ( 13), ( 14), (18), and ( 19), the natural logarithm of transmitted EM wave amplitude attenuation r and phase shift ϕ can be expressed as linear functions of ln r (x, f EM , t)…”

Section: Plasma Sheath Channel Characteristicsmentioning

confidence: 99%

“…Furthermore, the plasma sheath is not a steady-state medium. The electron density varies randomly under the influence of turbulence [16]- [18]. The plasma sheath areas at different axial positions have different multiplicative interference effects on EM waves with different frequencies.…”

mentioning

confidence: 99%

Spatial Selectivity of Plasma Sheath Channel at Millimeter Wave Band for Hypersonic Vehicle

Yao

Shi

et al. 2022

IEEE Trans. Plasma Sci.

Self Cite

View full text Add to dashboard Cite

Millimeter wave is a potential way to overcome the blackout problem. However, the plasma sheath is axially nonuniform, and it has different effects on millimeter wave at different axial positions. In this article, the influences of the spatially inhomogeneous time-varying plasma sheath on millimeter waves are investigated. The electron density model is established, the time-domain sequence of the random channel is calculated, and the channel statistical parameters at different axial positions are extracted. The results show that the millimeter wave channel is spatially selective. Millimeter waves can transmit through the plasma sheath with less attenuation, multiplicative interference, and nonlinear effects at any position of the vehicle except the nose. When the antenna position is properly selected, the attenuation and multiplicative interference intensity can be further reduced. This indicates that millimeter wave communication technology is the most promising way to overcome the blackout problem and accomplish diverse communication tasks of a hypersonic vehicle.

show abstract

“…URING returning capsule of spacecraft reentering, a plasma sheath covering the capsule surface is formed due to intense friction with the thin air [1]. The plasma sheath will adversely affect the communication signals between the vehicle and ground base station, such as attenuation, phase shift, and delay in communications and radar signals.…”

Section: Introductionmentioning

confidence: 99%

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Ouyang

Liu

Mao

et al. 2023

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

High density plasma source device is of great significance for ground experiment verification of vehicle reentry communication. APPJ, as a high-density plasma source, has received little attention in ground experiments on vehicle communications. In this paper, terahertz wave propagation characteristics in APPJ are investigated by joint simulation of APPJ discharge and terahertz transport model and related experimental measurements. THz-IF system is used to diagnose the electron density and terahertz transmission characteristics of APPJ for the first time, and the measured results are in good agreement with simulation results of joint simulation model in this paper and measured results of THz-TDS system of other researchers. Sheath thickness and electron density produced by self-designed APPJ are highly matched with the plasma sheath environment of HIFIRE-5b vehicle. Further analysis of the influence of different voltages and needle electrode radius on the terahertz transmission characteristics shows that the absorption effect plays a major role in terahertz wave attenuation in APPJ, and contribution of collision effect almost disappears, which is completely consistent with the phenomenon observed in HIFIRE-5b vehicle. The joint simulation model and THZ-IF method developed in this paper are of great significance for the ground test verification of reentry communication schemes.

show abstract

A layered fluctuation model of electron density in plasma sheath and instability effect on electromagnetic wave at Ka band

Cited by 34 publications

References 23 publications

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

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

Spatial Selectivity of Plasma Sheath Channel at Millimeter Wave Band for Hypersonic Vehicle

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Contact Info

Product

Resources

About