3D Imaging Algorithm for Non-Uniform Scanning 1D MIMO Array

In short-range millimeter-wave (MMW) 3D imaging applications, scanning 1-D multiple-input multiple-output (MIMO) array shows the advantages in low cost and fast data acquisition comparing to traditional single-input-single-output (SISO) and 2D MIMO techniques. However, in practical applications, the actual synthetic aperture array is non-uniform since uniform scanning is difficult to achieve. To solve this problem, a frequency-domain fast imaging algorithm based on non-uniform fast Fourier transform (NUFFT) is proposed in this paper. Simulation and experimental results show significant improvement in imaging efficiency comparing to traditional methods such as back projection (BP) algorithm, while maintaining the imaging quality.