DOA estimation by Hough transform in Phase Difference distribution versus Frequency

Direction Of Arrival (DOA) estimation is an important fundamental technique in the array signal processing field. In this paper, we propose a method, utilizing Hough transform for DOA estimation by a pair of sensors. Our proposed method which is based on time-frequency decomposition, applies Hough transform to the Phase Difference (PD) versus Frequency (PD-F) distribution of received mixture signals, and estimates DOA. By introducing bandwidth in the Hough parameter space, the stability and accuracy of DOA estimation are guaranteed. Through some experiments in a real acoustic circumstance, the effectiveness of the proposed method is shown.