Establishment of a Wideband Radar Scattering Center Model of a Plasma Sheath

Zhang, Xi; Liu, Yanming; Bai, Bowen; Li, Xiaoping; Shen, Fangfang; Chen, Xuyang; Zhao, Liang

doi:10.1109/access.2019.2943111

Cited by 18 publications

(11 citation statements)

References 22 publications

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“…For ease of calculation, we presuppose that the surface of the reentry object is made of metal. Then the reflection coefficient of the plasma-sheath-enveloped object surface can be obtained using the following equation [22] ( )…”

Section: Reflection Coefficient Calculation Of Layered Plasma Sheathmentioning

confidence: 99%

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Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath

Xie¹,

Li²,

Shen³

et al. 2022

Plasma Sci. Technol.

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The plasma sheath can induce radar signal modulation, causing not only ineffective target detection, but also defocusing in inverse synthetic aperture radar (ISAR) imaging. In this paper, through establishing radar echo models of the reentry object enveloped with time-varying plasma sheath, we simulated the defocusing of ISAR images in typical environment. Simulation results suggested that the ISAR defocusing is caused by false scatterings, upon which the false scatterings’ formation mechanism and distribution property are analyzed and studied. The range of false scattering correlates with the electron density fluctuation frequency. The combined value of the electron density fluctuation and the pulse repetition frequency jointly determines the Doppler of false scattering. Two measurement metrics including peak signal-to-noise ratio and structural similarity are used to evaluate the influence of ISAR imaging.

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Section: Reflection Coefficient Calculation Of Layered Plasma Sheathmentioning

confidence: 99%

“…For ease of analysis on range dimension, the independent parameters of fast-time are replaced with constants, and equation (22) can be rewritten as…”

Section: Formation Mechanism Of False Scatteringsmentioning

confidence: 99%

Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath

Xie¹,

Li²,

Shen³

et al. 2022

Plasma Sci. Technol.

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“…Along the vertical direction of the surface, a higher electron density appears closer to the surface. According to the research of the RAM-C II project, a non-uniform plasma sheath can be generally stratified into a model of evenly distributed plasma with multiple layers, and the multiple-layered model of plasma has been adopted in several related studies [12,13,20]. The propagation characteristics of EM waves in the plasma sheath are similar to those of EM waves in a lossy microwave transmission line, and can be written as a cascade of impedance of different characteristic waves.…”

Section: Reflection Coefficient and Reflection Depth Of Plasma Sheathmentioning

confidence: 99%

“…In their approach, the reentry object was treated as a single scattering point rather than multiple scattering points, which is a prerequisite for high-resolution ISAR imaging. Zhang et al proposed a wideband radar scattering center model of a plasma-sheathcovered reentry target, in which the reflection characteristics and velocity of the plasma sheath are considered [13]. Despite the fact that their research proposed a basic model, they did not conduct a profound analysis of the problems caused by the plasma sheath.…”

Section: Introductionmentioning

confidence: 99%

“…When the frequency of the incident EM waves is lower than the plasma frequency, the EM waves will be attenuated and cannot penetrate through the plasma [13]. Considering that the electron density distribution of the plasma has a double-Gaussian layered structure on the surface of the highspeed target [20], the outer layer electron densities of the plasma are low, so the EM wave can penetrate through them.…”

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confidence: 99%

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Inverse synthetic aperture radar range profile compensation of plasma-sheath-enveloped reentry object

Xie¹,

Li²,

Shen³

et al. 2022

Plasma Sci. Technol.

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According to the calculation of electromagnetic (EM) wave transmission, it is found that the EM waves cannot penetrate the high-electron-density areas of plasma enveloping the reentry object, and will be reflected at a certain depth in the plasma sheath to form scattering points. These scattering points will appear in the plasma sheath instead of on the reentry object surface. Because the existence of relative flow velocity between the plasma sheath and the spacecraft surface, the scattering points in plasma sheath characterized with coupled velocities, can cause pulse compression mismatching, which results in the displacement and energy diffusion in one-dimension range profile. When performing inverse synthetic aperture radar (ISAR) imaging on reentry object, the plasma sheath will defocus ISAR images in range dimension. To solve this problem, we deduce the echo model of plasma-sheath-enveloped reentry object. By estimating the coupled velocities, we propose a focusing method to correct the defocus of ISAR image in range dimension to improve the quality of ISAR images. The simulation results suggested that the echoes from different regions of the surface of reentry object had various coupling velocities, and the higher the coupled velocity, the more serious the displacement and energy diffusion in range dimension. Our proposed method can correct the range dimension aberration. Two measurement metrics were used to evaluate the improvement of the focusing method.

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Research on the spatio-temporal characteristics of high energy pulsed plasma jets

et al. 2022

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This research proposes a high-energy pulsed plasma jet for producing highly dynamic and huge gradient plasma. The injected plasma enters the plasma sheath, and the stealth of the high-speed vehicle is achieved by modulating the dynamics of the plasma sheath electron density. The characteristics of the plasma were extensively diagnosed using current–voltage measurements, high-speed cameras, and optical emission spectroscopy. This includes the electrical parameters of the plasma and its spatial and temporal distribution. The deposited energy rises and then falls as the pressure rises. The high-speed camera determines that the plasma injection process lasted 160.04 μs. The electron temperature ranges from 0.68 to 1 eV. The electron density ranges from 2.5 × 1016 to 2.1 × 1017 cm−3 with an increasing trend from 0 to 12 μs and a decreasing trend from 12 to 28 μs. As the axial position rises, the electron density gradually decays. The analysis of high-energy pulsed plasma jets provides the framework for future research into active stealth in high-speed vehicles.

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Establishment of a Wideband Radar Scattering Center Model of a Plasma Sheath

Cited by 18 publications

References 22 publications

Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath

Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath

Inverse synthetic aperture radar range profile compensation of plasma-sheath-enveloped reentry object

Research on the spatio-temporal characteristics of high energy pulsed plasma jets

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