Studies on the Effects of the Plasma Wake Flow Fields of Hypersonic Reentry Blunt Cone on Electromagnetic Wave

Wang, Yuxin; Liu, Song; Zhong, Shuangying

doi:10.1109/tps.2019.2926166

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…with respect to (p, q) = (2, 2), (2,4), (4,2) and (4,4). Finally, we obtain the central moment feature f 6 = u 22 , f 7 = u 24 , f 8 = u 42 and f 9 = u 44 .…”

Section: Appendix Amentioning

confidence: 99%

“…We can get different DRCS data according to different flying states of the target spacecraft and establish a complete classification and recognition database. However, when the aircraft is flying at ultra-high speed in near space, the gas molecules around the vehicle will be excited to ionize, and the outer surface of the vehicle will be covered with a thick layer of plasma, which is called "plasma sheath" in the field of radar remote sensing [3,4]. The plasma sheath absorbs and attenuates the detection radar wave emitted by the SBR, and even makes the EM wave deviate from the original propagation track, resulting in irregular and disordered changes of the scattered signals received by the radar, and thus the main information of the target is lost, which brings great challenges to radar remote sensing, tracking and identifying hypersonic targets [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath

Bao

Guo

2020

Remote Sensing

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Based on the detection platform of space-borne radar (SBR), the dynamic electromagnetic (EM) scattering characteristics of a hypersonic vehicle covered with plasma sheath are calculated and analyzed by the physical optics (PO) method. Using the angle-time conversion method, the dynamic radar cross section (DRCS) of the vehicle in horizontal flying path and different flying states is solved in the range of L-band to X-band. The relevant effective statistical features are extracted from the time-scale matrix of DRCS based on continuous wavelet transform (CWT). The numerical results show that: At different flying altitudes, the backscattering radar cross section (BRCS) of the hypersonic vehicle covered with plasma sheath has irregular fluctuation and large range reduction in the head region of the vehicle. Generally, the higher the incident EM wave frequency is, the more detailed the fluctuation characteristics of the DRCS can be reflected. Within the same radar illuminate angle range, the time consumed by the vehicle DRCS is inversely proportional to the flying height and flying speed and is directly proportional to the detection altitude of the SBR. Besides, the different kinds of statistical eigenvalues extracted from DRCS will play an important role in hypersonic targets classification and recognition.

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“…with respect to (p, q) = (2, 2), (2,4), (4,2) and (4,4). Finally, we obtain the central moment feature f 6 = u 22 , f 7 = u 24 , f 8 = u 42 and f 9 = u 44 .…”

Section: Appendix Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath

Bao

Guo

2020

Remote Sensing

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“…Besides radar signatures of hypersonic targets, also the study of the radio communication blackout during the atmospheric re-entry is an important application area. First, considering the plasma sheath as layered medium with constant plasma values in each layer [5], [6], [7], [8], second, applying ray tracers [9], and, third, solving the electromagnetic wave propagation in plasma with rigorous numerical approaches like Finite Difference Time Domain (FDTD) solvers [10], [11], [12], [13]. These solutions, however, are not exact and use some approximations like a rectangular grid in usual FDTD schemes or require further assumptions like the absence of a magnetic field to simplify the considerations.…”

Section: Introductionmentioning

confidence: 99%

The Measurement of Radar–Plasma Signatures in a Hypersonic Shock Tunnel: Simulation and Experiment

Petervari,

Weidner,

Nekris

et al. 2023

IEEE Trans. Aerosp. Electron. Syst.

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The plasma sheath that forms around a body in hypersonic flight can change the radar signature substantially. The prediction of radar-plasma-signatures, however, is complex, since it incorporates aerothermodynamics and electromagnetics and requires a number of critical assumptions on chemical and aerodynamic parameters as well as on the electromagnetic plasma model. Hence, such an approach requires thorough experimental validation to estimate and reduce its uncertainty. But radar data of hypersonic targets in free flight is extremely rare and, if existing, mostly unavailable. A different validation approach, which This work was funded in the scope of the basic funding of the French and the German MoD and in parts by a dedicated BAAINBw project.

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Progress in electron energy modeling for plasma flows and discharges

Parent,

Rodriguez Fuentes

2024

Physics of Fluids

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A novel formulation of the electron energy relaxation terms is presented here, which is applicable to plasma flows and discharges wherein the electron temperature could be higher or lower than the gas temperature. It is demonstrated that the electron energy losses due to inelastic collisions can be expressed as a function of only two species-dependent parameters: the reduced electric field and the reduced electron mobility. This formulation is advantageous over previous ones, being simpler to implement and more accurate when experimental data of the reduced electric field and reduced mobility are available. Curve fits to empirical data of these two properties are outlined here for all important air molecular species. The approach accounts for all inelastic electron energy relaxation processes without needing individual cross sections or rates, reducing potential errors associated with independently handling each process. Several test cases are presented to validate the proposed electron energy source terms including reentry plasma flows for which the electron temperature is less than the gas temperature, as well as discharges in which the electron temperature reaches values in excess of 30 eV. In all cases, the agreement with experimental data is observed to be very good to excellent, significantly surpassing prior electron energy models for plasma flows.

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Studies on the Effects of the Plasma Wake Flow Fields of Hypersonic Reentry Blunt Cone on Electromagnetic Wave

Cited by 8 publications

References 19 publications

Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath

Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath

The Measurement of Radar–Plasma Signatures in a Hypersonic Shock Tunnel: Simulation and Experiment

Progress in electron energy modeling for plasma flows and discharges

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