OAM radar based fast super-resolution imaging.

• A fast super-resolution OAM-radar imaging has been proposed. • Imaging efficiency has been enhanced greatly. • The influence of non-main-lobe direction can be avoided effectively. • A signal processing method has been introduced for reconstructing the target. We have proposed a fast super-resolution (FSR) imaging based on the electromagnetic (EM) OAM (orbital angular momentum) radar. The proposed method only needs to transmit EM vortex waves twice to achieve super-resolution imaging, which greatly improves the imaging efficiency of OAM radar. The OAM modes of the transmitting vortex EM waves are opposite in the proposed method. Therefore, the proposed method does not need to use concentric uniform circular array (UCA) for controlling beams, and the complexity of the system can be simplified effectively. In this paper, the FSR imaging model has been deduced, and the FSR imaging algorithm based on pulse compression and FFT has been also proposed for reconstructing the targets. The simulation results demonstrate that our proposed method has the superior effectiveness and better performances. [ABSTRACT FROM AUTHOR]