Electromagnetic Properties of High-Temperature Air

Bachynski, M. P.; Johnston, T. W.; Shkarofsky, I. P.

doi:10.1109/jrproc.1960.287607

Cited by 53 publications

(7 citation statements)

References 4 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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“…The dashed line in Figure 1(a) denotes the propagation path for the signals towards the onboard antenna. The electron collision frequency illustrated in Figure 1(b) was calculated according to [17]…”

Section: The Hypersonic Plasma Sheathmentioning

confidence: 99%

Sub-THz signals’ propagation model in hypersonic plasma sheath under different atmospheric conditions

Yuan

Wang

Shen

et al. 2017

Sci. China Inf. Sci.

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“…In view that, according to (1), as the incident wave frequency decreases, the real part and the imaginary part of the complex relative dielectric constant of the plasma sheath would decrease and increase, respectively, the influence of the plasma sheath on BRCS should be easier to be observed at lower frequencies. Hence, we repeat the scattering simulations by choosing = 300 MHz.…”

Section: Analyses Of Scattering Propertiesmentioning

confidence: 99%

“…Research on the electromagnetic scattering by or propagation through high temperature and high speed air or plasma medium may be dated back to the end of the 1950s [1][2][3]. Extensive investigations on the topic were continued in the 1960s [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Electromagnetic Scattering by a Hypersonic Cone-Like Body in Near Space

Qian

Zhang

Xia

2017

International Journal of Antennas and Propagation

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A numerical procedure for analysis of electromagnetic scattering by a hypersonic cone-like body flying in the near space is presented. First, the fluid dynamics equation is numerically solved to obtain the electron density, colliding frequency, and the air temperature around the body. They are used to calculate the complex relative dielectric constants of the plasma sheath. Then the volume-surface integral equation method is adopted to analyze the scattering properties of the body plus the plasma sheath. The Backscattering Radar Cross-Sections (BRCS) for the body flying at different speeds, attack angles, and elevations are examined. Numerical results show that the BRCS at a frequency higher than 300 MHz is only slightly affected if the speed is smaller than 7 Mach. The BRCS at 1 GHz would be significantly reduced if the speed is greater than 7 Mach and is continuously increased, which can be attributed to the absorption by the lossy plasma sheath. Typically, the BRCS is influenced by 5~10 dBm for a change of attack angle within 0~15 degrees, or for a change of elevation within 30~70 km above the ground.

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Electromagnetic Properties of High-Temperature Air

Cited by 53 publications

References 4 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

Sub-THz signals’ propagation model in hypersonic plasma sheath under different atmospheric conditions

Modelling of Electromagnetic Scattering by a Hypersonic Cone-Like Body in Near Space

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