太赫兹时域雷达成像研究

摘要

该文在太赫兹时域雷达基础上，通过改进后的后向投影(BP)算法对多种模型进行了系统的成像研究，验证了散射太赫兹时域信号的成像机制。成像结果显示实验实现了分辨6 mm的空间间隔；同时理论计算证明太赫兹时域雷达具有0.125 mm的横向和0.125 mm的纵向分辨率潜力。该文还对后向投影算法所产生的环形中心增强现象进行了分析讨论，并讨论了成像背景圆环的原因与抑制方法。%This study uses time domain terahertz radar system to discuss systematic imaging studies on the scaled models based on the improved Back-Projection (BP) algorithm. We image the scaled models with different shapes and are able to distinguish spatial gaps as small as 6 mm. The Theoretical calculation predicts that the lateral resolution and the axial resolution can be as high as 0.125 mm. Center enhancement and background rings caused by the algorithm in the imaging results are also qualitatively analyzed and are proposed methods to overcome this problem.