Fast Iterative Interpolated Beamforming for Accurate Single-Snapshot DOA Estimation

A single-snapshot fast computational Fourier-based direction-of-arrival (DOA) estimation method is introduced. This method applies the fast Fourier transform (FFT) to sensor data and performs effective cancellation of spectral leakage caused by sidelobe interactions, leading to unbiased DOA estimates of multiple sources. Successful elimination of spectral leakage is achieved by a sequential removal of strong sinc functions in the spatial frequency domain through an iterative interpolation process. The simulation results demonstrate superior performance of the proposed method over beamforming and other iterative FFT-based DOA estimation techniques as well as the high-resolution Root-MUSIC algorithm.