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A Sparse Bayesian Learning Approach for Vortex Electromagnetic Wave Three-dimensional Imaging in the Terahertz Band
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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。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.
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图 1 基于电磁涡旋ISAR的三维成像几何
Figure 1. Sketch map of the 3D imaging geometry based on electromagnetic vortex ISAR
图 4 l =0时距离-方位切片及不同幅度阈值划分结果
Figure 4. The range-azimuth image at l =0 and the results of different amplitude threshold setting method
图 6 目标散射点分布及其成像结果对比
Figure 6. The distribution of targets and comparison of imaging results
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