Suppressing ghost images for synthetic aperture THz imaging with large sampling spacing

This paper presents our study on the ghost images suppression for THz imaging system with large sampling spacing which are achieved by both sparse antenna array (SPA) of large element spacing (>8λ) and mechanical scanning. The ghost images in synthetic aperture imaging algorithm is due to the grating lobes of the array radiation pattern, so we propose a ghost image suppression method based on a weighting function in the traditional imaging algorithm. Therefore, the large sampling spacing between array elements for synthetic aperture THz imaging becomes possible, which can further reduce the cost and data acquisition time. And this study will help to guide the scheme design of SPA for THz imaging system.