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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 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 (CC BY 3.0).
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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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