Backscattering of a hypersonic cone with plasma sheath at different attack angles

Qian, J. W.; Zhang, H. L.; Xia, Mingyao

doi:10.1109/compem.2016.7588593

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The flow field distribution of the inhomogeneous medium is computed by CFD-FASTRON software [12], [13]. As the condition of the height and Mach flight speed, the CFD-FASTRAN software is divided by hexahedrons and the number of vertices on the hexahedrons equals to the number of unknowns.…”

Section: Plasma Flow Field Simulationmentioning

confidence: 99%

An Efficient Volumetric SBR Method for Electromagnetic Scattering From In-Homogeneous Plasma Sheath

Zhang

Chen

2019

IEEE Access

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A novel volumetric shooting and bouncing ray (VSBR) method is first proposed to analyze the electromagnetic scattering from in-homogeneous plasma sheath. The propagation of electromagnetic waves in a plasma sheath can be accurately traced by using rays in volumetric-meshed cells. The algorithm starts with tracking the ray tubes in the plasma sheath with high efficiency. Then, the reflection and transmission coefficients can be obtained by using the theory of electromagnetic waves' propagation in the lossy medium. At last, the scattering far fields can be easily calculated by taking the scattering field of each tube into consideration. As a comparison, the state-of-the-art high-frequency algorithms cannot deal with inhomogeneous lossy mediums of rapid varying. Meanwhile, it should also be noted that the proposed method can provide a more accurate result for analyzing layered plasma sheath than traditional high-frequency methods. Moreover, in this paper, the cubes' model with a different dielectric parameter, blunt cone, and hyper-sonic models are calculated with the finite-difference time-domain method (FDTD), the volumesurface integral equation method (VSIE), the traditional high-frequency method, and the proposed method. The results demonstrate the accuracy and efficiency of the proposed method. INDEX TERMS Inhomogeneous plasma, shooting and bouncing ray, tetrahedron, plasma sheath.

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Section: Plasma Flow Field Simulationmentioning

confidence: 99%

An Efficient Volumetric SBR Method for Electromagnetic Scattering From In-Homogeneous Plasma Sheath

Zhang

Chen

2019

IEEE Access

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“…Based on the hypersonic flow field data obtained in the repeatable laboratory simulations using ballistic range [11] or plasma wind tunnel [12], more practical physical models of hypersonic flow field can be established using the CFD technique [17]. By adopting a CFD tool to derive the distributions of electron density and atmospheric temperature around the targets, backscattering RCS of a hypersonic perfect electrical conductor (PEC) cone with a plasma sheath were investigated by Qian et al [22,23] using the volume-surface integral equation method incorporated with the multilevel fast multipole algorithm (MLFMA). However, only the properties at certain frequencies in the L-band were predicted.…”

Section: Introductionmentioning

confidence: 99%

Backward Scattering Characteristics of a Reentry Vehicle Enveloped by a Hypersonic Flow Field

Sun

Wang

Han

et al. 2018

International Journal of Antennas and Propagation

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The hypersonic flow field around a reentry vehicle has a significant influence on the ground-vehicle communication as well as on the detection and recognition of the reentry vehicle. Backward scattering characteristics of a reentry vehicle enveloped by a hypersonic flow field are analyzed using a high-order auxiliary differential equation finite difference time-domain (ADE-FDTD) method in this paper. Flow field parameters, including electron density, neutral particle density, and temperature, are obtained by solving the Navier-Stokes (NS) equations numerically. According to the flow field parameters, distributions of the plasma frequency and the collision frequency are then derived. Based on a validity of the physical model and the high-order ADE-FDTD method, backward radar cross sections (RCSs) of a perfect electrical conductor (PEC) sphere enveloped by a hypersonic flow field under different Mach numbers, heights, and incident angles of the electromagnetic (EM) wave are then investigated. Numerical results show that the incident angle of the EM wave exerts noticeable effects on the backward RCS, which is due to an inhomogeneous distribution of the plasma. The flight height and Mach number have significant influences on the distribution of the plasma that they play an important role in the variation of the RCSs. The results presented in this paper provide useful reference data for practical tests in ballistic range or in the high-frequency plasma wind tunnels, where a sphere target is usually used due to its simple shape.

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Backscattering of a hypersonic cone with plasma sheath at different attack angles

Cited by 2 publications

References 8 publications

An Efficient Volumetric SBR Method for Electromagnetic Scattering From In-Homogeneous Plasma Sheath

An Efficient Volumetric SBR Method for Electromagnetic Scattering From In-Homogeneous Plasma Sheath

Backward Scattering Characteristics of a Reentry Vehicle Enveloped by a Hypersonic Flow Field

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