Computationally Efficient Angle Estimation Using Maximum Likelihood In A Digital Beam-Forming Radar

We present a new signal processing method that uses maximum likelihood estimation (MLE) to estimate target angle-of-arrival (AOA) for a digital beam-forming phased array radar. We describe the motivations for abandoning conventional monopulse estimation, and contrast our proposed method to other recently proposed MLE approaches. In particular, we describe a method which eases the computational burden associated with maximum likelihood AOA estimation, making it feasible for use in real-time signal processors for phased array radar systems. We discuss improvements in beam-shape loss and AOA estimate accuracy for search radar applications.