Gradient-projection based super-resolution wideband DOA estimation using non-uniform linear arrays

• Main Authors: Jirhande, M.J (Author), Kahaei, M.H (Author)
• Format: Article
• Language: English
• Published: John Wiley and Sons Inc 2023
• Subjects: Convex optimization; Direction of arrival; Direction of arrival estimation; direction-of-arrival estimation; Gradient projections; Initial estimate; Non-uniform linear arrays; Numerical methods; Optical resolving power; optimisation; Optimisations; Resolution theory; signal processing; Signal-processing; Superresolution; Wide-band; Wideband source
• Online Access: View Fulltext in Publisher

 A new method is developed for the Direction of Arrival (DOA) estimation of wideband sources by refining the initial estimates and posing the super-resolution theory in a non-convex optimization problem. A gradient-projection method is conducted for the accurate estimation of DOAs. The proposed method can be performed by any non-uniform linear array with no need for any focusing matrices. Moreover, a greedy search algorithm is employed to obtain initial estimates for super-resolution implementation. Numerical simulations show the outstanding accuracy of the proposed method and more robustness to noise compared to some well-known methods. It is also more effective for DOA estimation of adjacent sources. © 2023 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.