一种0.34 THz站开式三维成像安检仪

A 0.34 THz 3D imaging radar for standoff personal screening

摘要:

介绍了一种太赫兹站开式大视角三维成像雷达系统。系统可用于人体隐藏危险品的成像检测，采用二维非均匀逐点扫描的工作方式，视场范围达到0.6 m×1 m，成像速度达到2 s。系统工作于0.34 THz，采用直径450 mm椭球镜聚焦，在5.8 m的成像距离实现了2 cm的方位分辨力。为了改善回波动态范围，采用相位噪声相消的系统结构。系统采用调频连续波(FMCW)雷达线性调频信号作为工作波形，工作带宽达到12 GHz。成像结果显示，系统校正后的距离分辨力可达到2 cm，能够实现隐藏危险品的有效检测。

Abstract:

A summary of a 0.34 THz standoff 3D imaging radar is presented which can be used for through-clothes imaging of person-borne concealed objects. Using a two dimensional non-uniform point-by-point scanning mode, a field of view of 0.6 m×1 m and 2 s imaging speed is achieved. The central frequency is 0.34 THz, and a 2 cm azimuth resolution at 5.8 m is obtained by using a ellipsoid with a diameter of 450 mm. In order to improve the dynamic range of the system, a phase noise cancellation structure is adopted. The Frequency-Modulated Continuous-Wave(FMCW) radar technique with a 12 GHz bandwidth is employed in the system. Imaging result shows that 2 cm range resolution can be achieved after calibration and the system can be utilized to detect concealed weapons.