Small aperture microphone arrays provide many advantages for portable devices and hearing aid equipment. In this paper, a\nsubspace based localization method is proposed for acoustic source using small aperture arrays. The effects of array aperture\non localization are analyzed by using array response (array manifold). Besides array aperture, the frequency of acoustic source\nand the variance of signal power are simulated to demonstrate how to optimize localization performance, which is carried out by\nintroducing frequency error with the proposed method. The proposed method for 5mm array aperture is validated by simulations\nand experiments with MEMS microphone arrays. Different types of acoustic sources can be localized with the highest precision\nof 6 degrees even in the presence of wind noise and other noises. Furthermore, the proposed method reduces the computational\ncomplexity compared with other methods.
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