Monopulse Angle Measurement with Orbital Angular Momentum Charge Distribution

A novel method based on momentum estimation is proposed for monopulse angle measurement in radar systems. The direction of arrival (DOA) is estimated with orbital angular momentum (OAM) topological charge distribution in the radar array plane. Our proposal is compatible for field with non-plane phase-front. The instances of sphere phase-front, vortex phasefront and interference pattern induced by phase shifted transmitters are investigated. According to the results, the proposed method exhibits superiority in estimating the DOA of electromagnetic field with non-plane phase-front compared with the amplitude comparison method.