A Narrowband Sound Source Localization Method and System Based on A Non-uniform Linear Microphone Array

Abstract

Based on the phase delay estimation of narrowband signals, a signal localization method is proposed in this paper by using a non-uniform linear array, which solves the phase wrapping problem caused by the increase of array element spacing and improves the accuracy of localization. This paper proposes an estimation algorithm for correcting the amount of wrapping and calculating the time delay in the case of nonuniform linear array approach, and gives the conditions that need to be satisfied for non-uniform array element spacing. The signal localization method improves the available array aperture for positioning and greatly reduces the number of array elements required for the same aperture compared to a general uniform linear array, thus reducing the need for subsequent signal processing equipment. A localization system is also constructed and tested. The experiments show that the method effectively improves the accuracy of localization of narrowband sound sources in open space.