Fast Two-Dimensional High-Resolution DoA Estimation for Millimeter-Wave Radar Systems Based on Iterative Adaptive Approach

A Direction of Arrival (DoA) estimation method based on the Iterative Adaptive Approach (IAA) for high-resolution and computationally efficient 2D DoA estimation in complex arrays is proposed in this paper. The method initially utilizes the Fast Iterative Adaptive Approach (FIAA) to obtain azimuth information, which is then used to determine the target's location and angle matching. Subsequently, the SFIAA method is introduced. It estimates the angles within the azimuth range determined by FIAA, providing elevation information. Finally, by merging the information from both dimensions through angle matching, accurate estimation is achieved.The performance of the proposed method is extensively validated through simulation and practical testing, and comparisons are made with existing methods. The results demonstrate that the proposed method significantly reduces computational complexity without sacrificing performance, offering broad applicability and superiority.