Passive OAM-Based Radar Imaging With Single-In-Multiple-Out Mode

In recent years, the orbital angular momentum (OAM) has been widely applied in the target detection and imaging to improve the performance of conventional radar systems. A passive OAM-based radar imaging method is studied in this letter. Compared with active OAM-based imaging approaches, the proposed method can reduce the complexity of the transmitting system and achieve the azimuthal profile even with small elevation angle. The imaging model is deduced with the single-in-multiple-out mode, and the imaging algorithm based on back projection is proposed to reconstruct the targets. Theoretical and simulation results demonstrate that the target profile can be reconstructed correctly with a single snapshot, and the proposed method is effective even when the elevation angle of radar observation is small. Moreover, this imaging technique is robust against noise influence.