Orbital Angular Momentum Based Monopulse Angle Estimation against Cross-eye Jamming

Cross-eye jamming exhibits significant threat against current monopulse radars. In this work, a novel method based on orbital angular momentum evaluation is proposed for robust monopulse angle estimation against cross-eye jamming. The direction of arrival of the incident electromagnetic field is estimated with the spatial gradients of the orbital angular momentum topological charge distribution in the radar plane. The mathematical modeling as well as the numerical simulations are performed. According to the results, the angular estimation errors with our proposal is much lower compared with the traditional approach based on amplitude comparison in presence of cross-eye jamming.