Investigating Distribution Characteristics of Electromagnetic Reflection Intensity and Intrapulse Doppler Frequency Coupling Mechanism of Plasma-Sheath-Covered Target

IF 1.3 4区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

IEEE Transactions on Plasma Science Pub Date : 2025-02-04 DOI:10.1109/TPS.2024.3382774

Bowen Bai;Dongsheng Zhao;Zixuan Chang;Yi Ding

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Abstract

Due to the high velocity of hypersonic target, the target surface is covered with plasma sheath. For radar detecting on hypersonic target, the spatial distribution characteristics of plasma sheath cause significant differences in echo intensity and frequency offset at different areas of the target surface. In order to further investigate the reflection characteristics of each area of the target, this study adopts a difference-equivalent transmission line method to calculate the distribution characteristics of reflection intensity of the plasma-sheath-covered target and reveals the coupling mechanism of intrapulse Doppler frequency of the reflected wave by utilizing frequency offset effect. First, based on numerical calculation results of surface flow field, we analyzed the spatial distribution characteristics of the electron density and velocity of the plasma sheath. Second, we obtained the influence laws at different altitudes and carrier frequencies on the reflection intensity distribution and frequency offset of the plasma-sheath-covered target in each area. Finally, by constructing 1-D range profile of target radar echo, we further revealed the influence mechanism of the reflection characteristics of plasma-sheath-covered target on radar detection. Our research results lay a solid theoretical foundation for calculating the scattering characteristics of plasma-sheath-covered targets, reliable and robust radar detection, and even electromagnetic (EM) stealth performance under active modulation.

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等离子体覆盖靶体电磁反射强度分布特性及脉冲内多普勒频率耦合机理研究

由于高超声速目标的高速度，目标表面覆盖有等离子体鞘层。在高超声速目标雷达探测中，等离子体鞘层的空间分布特性导致目标表面不同区域的回波强度和频偏存在显著差异。为了进一步研究目标各区域的反射特性，本研究采用差分等效传输线法计算了等离子体鞘层覆盖目标反射强度的分布特性，并利用频偏效应揭示了反射波脉冲内多普勒频率的耦合机理。首先，基于表面流场的数值计算结果，分析了等离子体鞘层电子密度和速度的空间分布特征。其次，得到了不同海拔高度和载波频率对各区域等离子体覆盖目标反射强度分布和频偏的影响规律；最后，通过构建目标雷达回波的一维距离像，进一步揭示了等离子体覆盖目标反射特性对雷达探测的影响机理。研究结果为计算等离子体覆盖目标的散射特性、可靠鲁棒的雷达探测以及有源调制下的电磁隐身性能奠定了坚实的理论基础。

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来源期刊

IEEE Transactions on Plasma Science 物理-物理：流体与等离子体

CiteScore

3.00

自引率

20.00%

发文量

538

审稿时长

3.8 months

期刊介绍： The scope covers all aspects of the theory and application of plasma science. It includes the following areas: magnetohydrodynamics; thermionics and plasma diodes; basic plasma phenomena; gaseous electronics; microwave/plasma interaction; electron, ion, and plasma sources; space plasmas; intense electron and ion beams; laser-plasma interactions; plasma diagnostics; plasma chemistry and processing; solid-state plasmas; plasma heating; plasma for controlled fusion research; high energy density plasmas; industrial/commercial applications of plasma physics; plasma waves and instabilities; and high power microwave and submillimeter wave generation.