Direction of arrival 2 Direction of arrival estimation 2 Numerical methods 2 direction-of-arrival estimation Atomic norm 1 Convex optimization 1 Coprime 1 Coprime array 1 Covariance matrices 1 Covariance matrix 1 Degree-of-freedom 1 Degrees of freedom (mechanics) 1 Estimation 1 Frequency allocation 1 Frequency diverse array 1 Frequency diversity 1 Frequency estimation 1 Gradient projections 1 Initial estimate 1 Mean square error 1 Minimisation 1 Minimization 1 Non-uniform linear arrays 1 Optical resolving power 1 Optimisations 1 Parameters estimation 1 Problem solving 1 Resolution theory 1 Sensor arrays 1 Sensors 1