范红旗,
李双勋
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(61871386, 62171446)
详细信息
作者简介:蒋彦雯，女，国防科技大学电子科学学院讲师，从事阵列雷达成像与信号处理研究
范红旗，男，国防科技大学电子科学学院研究员，从事雷达目标检测与信息融合等研究
李双勋，男，国防科技大学电子科学学院副研究员，从事雷达目标探测等研究
通讯作者:蒋彦雯 j1991yuwen@163.com
责任主编：郭忠义 Corresponding Editor: GUO Zhongyi中图分类号:TN95
计量
文章访问数:181
HTML全文浏览量:184
PDF下载量:105
被引次数:0
出版历程
收稿日期:2021-10-16
修回日期:2021-10-25
网络出版日期:2021-10-26
刊出日期:2021-10-28
A Sparse Bayesian Learning Approach for Vortex Electromagnetic Wave Three-dimensional Imaging in the Terahertz Band
JIANG Yanwen,,FAN Hongqi,
LI Shuangxun
College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China
Funds:The National Natural Science Foundation of China (61871386, 62171446)
More Information
Corresponding author:JIANG Yanwen, j1991yuwen@163.com
摘要
摘要:在逆合成孔径雷达(ISAR)成像体制下，当太赫兹雷达发射带宽信号且波形为涡旋电磁波时，利用涡旋电磁波形成的差异性辐射场和雷达与目标相对运动形成的合成孔径，通过方位俯仰的信息解耦最终可实现目标高分辨三维成像。因此，该文建立了基于电磁涡旋ISAR的目标三维成像模型，提出了一种基于稀疏贝叶斯学习(SBL)的图像重建方法和分区域幅度阈值设置方法，极大地简化了成像过程，减少了计算量。仿真结果表明，相比传统的基于快速傅里叶变换的成像方法，该文提出的SBL方法可以获得更高的成像分辨率，且重构性能随信噪比的增大而提升。
关键词:逆合成孔径雷达/
三维成像/
太赫兹雷达/
稀疏贝叶斯学习/
涡旋电磁波
Abstract:In the Inverse Synthetic Aperture Radar (ISAR) imaging system, when the terahertz radar transmits the wide bandwidth signal and vortex electromagnetic wave, Three-Dimensional (3D) high-resolution imaging can be achieved through information decoupling based on the differential radiation field formed by the vortex electromagnetic wave and the synthetic aperture formed by the relative movement of the radar and the target. Accordingly, a 3D imaging model based on the terahertz vortex electromagnetic wave ISAR is established. A new image reconstruction method is proposed based on the Sparse Bayesian Learning (SBL) and subregion amplitude threshold setting methods. The proposed method can significantly simplify the imaging procedure and reduce the computational load. The simulation results indicate that the proposed SBL method can achieve a higher resolution than the conventional fast Fourier transform-based method, and its reconstruction performance increases with an increase in the signal-to-noise ratio.
Key words:Inverse Synthetic Aperture Radar (ISAR)/
Three-dimensional imaging/
Terahertz radar/
Sparse Bayesian Learning (SBL)/
Vortex electromagnetic wave
PDF全文下载地址:
https://plugin.sowise.cn/viewpdf/198_dbc8716e-ad59-459e-ae0b-4d326da40bee_R21151
