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Sensors 2014, 14(3), 4384-4398; doi:10.3390/s140304384
Article

Design of Small MEMS Microphone Array Systems for Direction Finding of Outdoors Moving Vehicles

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, 1,2,* , 1,2,3
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1 Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China 2 Science and Technology on Micro-System Laboratory, Chinese Academy of Sciences, Shanghai 200050, China 3 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
* Author to whom correspondence should be addressed.
Received: 22 January 2014 / Revised: 12 February 2014 / Accepted: 27 February 2014 / Published: 5 March 2014
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a MEMS microphone array system scheme is proposed which implements real-time direction of arrival (DOA) estimation for moving vehicles. Wind noise is the primary source of unwanted noise on microphones outdoors. A multiple signal classification (MUSIC) algorithm is used in this paper for direction finding associated with spatial coherence to discriminate between the wind noise and the acoustic signals of a vehicle. The method is implemented in a SHARC DSP processor and the real-time estimated DOA is uploaded through Bluetooth or a UART module. Experimental results in different places show the validity of the system and the deviation is no bigger than 6° in the presence of wind noise.
Keywords: direction finding; MEMS microphone array; small aperture arrays; system design; UGS direction finding; MEMS microphone array; small aperture arrays; system design; UGS
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zhang, X.; Huang, J.; Song, E.; Liu, H.; Li, B.; Yuan, X. Design of Small MEMS Microphone Array Systems for Direction Finding of Outdoors Moving Vehicles. Sensors 2014, 14, 4384-4398.

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