毫米波非均匀平面阵列无损检测三维成像算法  

Millimeter wave three-dimensional imaging algorithm of nonuniform planar array for nondestructive testing

作　　者：马昭阳 邓桂林 曾旸 邓彬[1] 杨琪 王宏强[1] MA Zhaoyang;DENG Guilin;ZENG Yang;DENG Bin;YANG Qi;WANG Hongqiang(College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073

出　　处：《国防科技大学学报》2022年第1期8-13,共6页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(61871386,61971427,62035014,61921001)。

摘　　要：毫米波因其分辨力强、穿透性强、光子能量低的独特优势,在无损检测领域具有极大的潜力。针对毫米波无损检测应用,结合距离徙动算法和非均匀快速傅里叶变换的思想,提出一种适用于非均匀平面阵列的三维成像算法。该算法利用非均匀快速傅里叶变换在波数域重构信号频谱,克服了非均匀空间采样对传统基于傅里叶变换的成像算法的限制;该算法应用非均匀快速傅里叶变换省去了复杂的插值操作,提高了成像效率。为验证所提算法的有效性,将后向投影算法作为对比,分别进行仿真和实验。仿真和实验结果均表明所提算法能兼顾成像精度和速度,实现对介质目标的高效率成像。Millimeter wave has great potential in the field of nondestructive testing due to its unique advantages of high resolution,high penetration and low photon energy.For the application of millimeter wave nondestructive testing,a three-dimensional imaging algorithm for nonuniform planar array was proposed by combining the idea of the range migration algorithm and the nonuniform fast Fourier transform.The proposed algorithm uses nonuniform fast Fourier transform to reconstruct the signal spectrum in wavenumber domain,which overcomes the limitation of nonuniform spatial sampling on traditional imaging algorithms based on Fourier transform.The proposed algorithm is aimed to eliminate the complicated interpolation operation and improve the imaging efficiency.In order to verify the effectiveness of the proposed algorithm,the back projection algorithm was used as a comparison,the simulation and experiment was carried out,respectively.Simulation and experimental results all show that the proposed algorithm can achieve high-efficiency imaging of dielectric targets with high imaging accuracy and fast speed.

关 键 词：毫米波 无损检测 非均匀阵列 三维成像 

分 类 号：TN95[电子电信—信号与信息处理]