Multistatic Terahertz Imaging Using the Radon Transform
Multistatic Terahertz Imaging Using the Radon Transform
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DOI：
10.1109/tap.2019.2891461
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发表时间：
2019-04-01
影响因子：
5.7
通讯作者：
Trichopoulos, Georgios C.
中科院分区：
文献类型：
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作者：
Theofanopoulos, Panagiotis C.;Sakr, Mahmoud;Trichopoulos, Georgios C.
我们提出了一种新的毫米波（mmW）和太赫兹（THz）频率的紧凑型低轮廓成像仪成像方法。该方法借鉴了计算机断层扫描的原理，使用简化的射频前端生成二维或三维高分辨率图像。为了实现成像，该方案实现了投影切片定理。具体来说，它记录目标视场（FOV）的Radon变换（RT），并利用傅里叶切片定理重建图像。为了实现视场的照明，提出的成像配置使用旋转线性天线阵列，产生高度定向的风扇光束。在不影响图像重建过程的情况下，使用多静态稀疏阵列技术进一步减少了天线单元。通过大幅减少有源元件的数量，新方法可以将高分辨率毫米波/太赫兹成像系统嵌入到低姿态和轻型平台中，包括无人机或立方体卫星。在本文中，我们提出了新成像方案的基本概念和仿真结果，验证了概念的证明。最后，我们提出了一种改进的成像天线阵列，以减轻视场外物体和源的干扰。
We present a novel imaging method for compact low-profile imagers in millimeter wave (mmW) and terahertz (THz) frequencies. The method borrows the principles of computerized tomography to generate 2-D or 3-D high-resolution images using simplified RF front ends. To perform imaging, the proposed scheme implements the projection-slice theorem. Specifically, it records the Radon transform (RT) of the desired field-of-view (FOV) and reconstructs the image using the Fourier slice theorem. To achieve the illumination of the FOV, the proposed imaging configuration uses a rotating linear antenna array that produces a highly directive fan beam. The antenna elements are further reduced using multistatic sparse array techniques without compromising the image reconstruction process. By dramatically reducing the number of active elements, the new method could allow high-resolution mmW/THz imaging systems to be embedded in low profile and lightweight platforms, including unmanned aerial vehicles or CubeSats. In this paper, we present the basic concept of the novel imaging scheme and simulation results verifying the proof of concept. Finally, we present a modified imaging antenna array that alleviates interference from objects and sources outside the FOV.