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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。
Based on the terahertz time-domain radar, a systematic imaging study of various models is carried out by using the improved back projection (BP) algorithm. The imaging mechanism of the signals in the scattered terahertz time-domain is verified. The imaging results show that the experiment has realized the spatial resolution of 6 mm. At the same time, the theoretical calculation shows that the terahertz time-domain radar has the potential of horizontal resolution of 0.125 mm and longitudinal resolution of 0.125 mm. The article also analyzes and discusses the ring center enhancement phenomenon generated by the backward projection algorithm, and discusses the reason and suppression method of imaging the background ring.