毫米波非均匀平面阵列无损检测三维成像算法

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...

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

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.