刘康,,
王煜,
王宏强
国防科技大学电子科学学院 长沙 410073
基金项目:国家自然科学基金(61801486, 61921001)
详细信息
作者简介:王建秋(1994–)，男，安徽安庆人，国防科技大学电子科学学院博士研究生。主要研究方向为电磁涡旋与雷达前视成像
刘康：刘 康(1990–)，男，江苏泗阳人，国防科技大学电子科学学院副教授。主要研究方向为雷达前视成像与电磁涡旋
王煜：王 煜(1996–)，男，江苏东台人，国防科技大学电子科学学院博士研究生。主要研究方向为涡旋电磁波雷达探测与信号处理
王宏强(1970–)，男，陕西人，国防科技大学电子科学学院研究员。主要研究方向为太赫兹雷达与雷达成像
通讯作者:刘康 liukang1117@126.com
责任主编：郭忠义 Corresponding Editor: GUO Zhongyi中图分类号:TN95
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被引次数:0
出版历程
收稿日期:2021-04-23
修回日期:2021-06-09
网络出版日期:2021-06-22
刊出日期:2021-10-28
Resolution Analysis of Vortex Electromagnetic Radar Imaging
WANG Jianqiu,LIU Kang,,
WANG Yu,
WANG Hongqiang
College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China
Funds:The National Natural Science Foundation of China (61801486, 61921001)
More Information
Corresponding author:LIU Kang, liukang1117@126.com
摘要
摘要:相位波前受轨道角动量调制的涡旋电磁波，在雷达前视成像领域得到广泛关注和研究。基于涡旋电磁波雷达成像原理和方法，该文重点对方位分辨力展开研究。首先，分析了贝塞尔幅度项对方位分辨性能的影响，结果表明，在贝塞尔幅度窗影响下，涡旋电磁波雷达方位分辨性能由有效OAM模态范围决定。其次，提出了一种有效OAM模态范围计算方法，并分别对方位角分辨率、空间分辨率以及超实孔径雷达分辨率进行了表征。最后，仿真分析了方位基本分辨性能随不同影响因素的变化规律，改变波长孔径比、成像俯仰角，能增大有效OAM模态范围，提升方位分辨性能。拟合得到了有效OAM模态范围、超实孔径雷达分辨率关于波长孔径比和成像俯仰角的近似表达式，为涡旋电磁波雷达参数设计与优化提供参考。
关键词:轨道角动量/
涡旋电磁波雷达成像/
分辨率表征/
有效OAM模态范围/
分辨性能分析
Abstract:The vortex ElectroMagnetic (EM) wave, whose phase wavefront is modulated by the Orbital Angular Momentum (OAM), has received immense attention, especially in the field of forward-looking radar imaging. Based on the fundamental principle and imaging method of the vortex EM radar, the azimuth resolution was studied in this paper. First, the circumstance of considering the Bessel amplitude term was analyzed, indicating that the azimuth resolution was determined by the effective scope of OAM modes. Then, an effective method for calculating the scope of OAM modes was proposed, including the expressions of azimuth resolution, spatial resolution, and super-resolution were characterized. Finally, the fundamental resolution performance with different influencing factors was analyzed via simulations. The analysis showed that changing the wavelength aperture ratio and imaging elevation could increase the effective scope of OAM modes, which improved the azimuth resolution. Through data fitting, the approximate expressions of the effective scope of OAM modes and the resolution of the super-real aperture radar with respect to the wavelength aperture ratio and imaging elevation were obtained separately, providing a reference for the parameters design and optimization of vortex EM wave radar.
Key words:Orbital Angular Momentum (OAM)/
Vortex electromagnetic wave radar imaging/
Resolution characterization/
Effective scope of OAM modes/
Resolution performance analysis
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