红外与毫米波学报2021，Vol.40Issue(5)：638-646,9.DOI:10.11972/j.issn.1001-9014.2021.05.010
可快速精确重建的毫米波MIMO近距离成像机制研究
Research on the MIMO short-range imaging mechanism of millimeter wave for fast and accurate reconstruction
摘要
Abstract
Millimeter-wave(MMW)imaging is of interest as it has played an essential role in personal surveil-lance. The existing MMW short-range imaging mechanisms in personal surveillance can be mainly divided into SISO and MIMO. The SISO mechanism can achieve fast and accurate imaging. However,as the operating fre-quency increases,the number of antennas required increases rapidly,and the antenna spacing decreases,which not only causes an increase in system cost,but also makes it difficult to suppress antenna coupling. Although the MIMO mechanism reduces the number of antennas required for imaging and increases the antenna spacing,it is currently unable to achieve rapid and accurate reconstruction comparable to the SISO mechanism. In this paper,a MIMO short-range imaging mechanism has been proposed,which is well-suitable for fast and accurate reconstruc-tion,and the applicable conditions of the mechanism were given quantitatively. Unlike the traditional MIMO short-range imaging mechanism,the proposed MIMO imaging mechanism satisfies the principle of equivalent phase center(EPC)in short-range imaging by ingeniously designing MIMO sub-arrays. Therefore,it can directly use various accurate and fast imaging algorithms developed for SISO mechanism to reconstruct images,such as range migration algorithm(RMA). It means that the algorithm has the advantages of both SISO mechanism and MIMO mechanism. The demonstrations in E-band show that the proposed MIMO mechanism exhibits the same level of imaging quality and reconstruction speed as SISO mechanism in short-range imaging,but the antenna uti-lization rate and the antenna spacing can be increased by more than 4 times. When compared with the traditional MIMO imaging mechanism,the proposed MIMO mechanism not only has better imaging quality but also greatly improves the reconstruction speed,which is nearly 200,000 times faster than the traditional MIMO mechanism in a typical imaging scene of 1m×1m×0. 2m volume with a voxel size of 1. 85 mm3 . Both simulation and experimen-tal results verify the effectiveness of the proposed MIMO mechanism.关键词
毫米波/MIMO/近距离成像/快速精确成像算法Key words
millimeter wave/MIMO/short-range imaging/fast and accurate imaging algorithm分类
信息技术与安全科学引用本文复制引用
于洋,游燕,陈旭东,乔灵博,赵自然..可快速精确重建的毫米波MIMO近距离成像机制研究[J].红外与毫米波学报,2021,40(5):638-646,9.基金项目
Supported by the National Natural Science Foundation of China(61731007) （61731007）
