Design of small MEMS microphone array systems for direction finding of outdoors moving vehicles

Xin Zhang; Jingchang Huang; Enliang Song; Huawei Liu; Baoqing Li; Xiaobing Yuan

doi:10.3390/s140304384

Design of small MEMS microphone array systems for direction finding of outdoors moving vehicles

Sensors (Basel). 2014 Mar 5;14(3):4384-98. doi: 10.3390/s140304384.

Authors

Xin Zhang¹, Jingchang Huang², Enliang Song³, Huawei Liu⁴, Baoqing Li⁵, Xiaobing Yuan⁶

Affiliations

¹ Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. zxinscholar@gmail.com.
² Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. jchhuang@mail.ustc.edu.cn.
³ Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. songenliang@mail.sim.ac.cn.
⁴ Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. liuhuawei2008@yahoo.cn.
⁵ Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. libq@mail.sim.ac.cn.
⁶ Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. yuanxb@mail.sim.ac.cn.

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.

MeSH terms

Acoustics
Algorithms
Computer Systems
Equipment Design
Micro-Electrical-Mechanical Systems / instrumentation*
Motor Vehicles*
Movement*
Signal Processing, Computer-Assisted
Software
Time Factors
User-Computer Interface