应用于太赫兹成像的弧形多收多发阵列的设计方法  

Design Method of Arc Multiple-Input Multiple-Output Array for Terahertz Imaging

作　　者：于洋 乔灵博[2] 游燕 赵自然[1,2] Yu Yang;Qiao Lingbo;You Yan;Zhao Ziran(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;National Engineering Laboratory for Dangerous Articles and Explosives Detection Technologies,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学工程物理系,北京100084 [2]清华大学危爆物品扫描探测技术国家工程实验室,北京100084

出　　处：《中国激光》2019年第6期172-178,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金委员会与中国民用航空局联合资助(U1633202);国家自然科学基金重点项目(61731007)

摘　　要：提出了基于等效阵列概念的弧形多收多发(MIMO)阵列的设计方法,依照该方法设计了一种50发60收的弧形MIMO阵列,并在太赫兹波段进行仿真分析。结果表明,所设计的弧形MIMO阵列的成像分辨率接近于理论极限;该弧形MIMO阵列与包含3000个收发同置天线的等效阵列相比,点扩展函数的主瓣宽度一致、旁瓣波峰波谷的位置一一对应,其等效性得到了验证;与传统直线MIMO阵列相比,弧形MIMO阵列的成像范围较大,其旁栅伪影得到明显抑制,这有利于获得更好的曲面目标侧面成像效果。In this study,we propose a design method to develop an arc multiple-input multiple-output(MIMO) antenna array based on the equivalent array concept.Further,an arc MIMO antenna array containing 50 transmitters and 60receivers is designed.The simulation experiment and analysis conducted in the terahertz band denote that the imaging resolution of the arc MIMO array is almost equal to the theoretical limit.When compared with an equivalent array containing 3000 transmitters,the main-lobe widths of both the point spread functions are observed to be almost identical,and the positions of the side lobe peaks and valleys correspond accordingly. Subsequently,the equivalence between the arc MIMO array and the equivalent array can be verified based on the simulation results.When compared with the traditional linear MIMO array,the arc MIMO array exhibits a larger imaging range,and its side gating artifacts are almost completely reduced.These factors are important to obtain better imaging results with respect to the side view of the curved surface imaging targets.

关 键 词：太赫兹技术 成像系统 多收多发 阵列设计 安检 

分 类 号：TN957.52[电子电信—信号与信息处理]