一种用于人体安检的三维稀疏太赫兹快速成像算法

Fast Three-dimensional Sparse Holography Imaging Algorithm for Personal Security Verification

太赫兹全息成像技术在人体安检成像、隐匿武器检测、无损检测等领域具有广阔的应用前景。该文提出了一种能够避免产生距离混叠现象的3维稀疏太赫兹快速成像体制和成像算法。该方法通过对太赫兹雷达的3维成像几何及相应回波模型的分析,利用随机稀疏频点数据来有效消除距离混叠现象;同时利用对稀疏回波数据的频谱搬移和插值来获得包含目标完整信息的3维数据,以实现对目标的3维分辨成像。通过对0.2 THz波段的仿真和实验数据的重建,验证了算法的正确性和有效性。

Terahertz holographic imaging has broad applications in the field of personal security verification, concealed weapon detection, and non-destructive testing. To suppress the range ambiguity, a fast sparse image reconstruction approach and imaging scheme is proposed for three-dimensional terahertz holography. The proposed algorithm establishes the terahertz imaging geometry and corresponding echo model. The range ambiguity is eliminated using the random step frequency method, and a frequency shift procedure is applied to recover the targets with a high computational efficiency. Simulation and experimental results verify the proposed algorithm.