A Compensation Method Based on Electromagnetic Vortex Synthetic Aperture Radar Imaging

Electromagnetic (EM) waves carrying orbital angular momentum (OAM) has a spiral phase wavefront, which can be applied to radar as well as wireless communication. It is reported that synthetic aperture radar (SAR) imaging based on vortex EM waves can achieve azimuth high resolution. Meanwhile, point targets defocus due to the two-dimensional space-variant distribution of intensity and phase of vortex beams. In this paper, the distortion of targets caused by vortex beams is discussed and a compensation method to solve the distortion in vortex SAR imaging is proposed. The simulation results show the effectiveness of the proposed algorithm.