title: Design of small MEMS microphone array systems for direction finding of outdoors moving vehicles.
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.
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. zxinscholar@gmail.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. jchhuang@mail.ustc.edu.cn.
authors.forename: Jingchang
authors.initials: J
authors.lastname: Huang
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. songenliang@mail.sim.ac.cn.
authors.forename: Enliang
authors.initials: E
authors.lastname: Song
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. liuhuawei2008@yahoo.cn.
authors.forename: Huawei
authors.initials: H
authors.lastname: Liu
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. libq@mail.sim.ac.cn.
authors.forename: Baoqing
authors.initials: B
authors.lastname: Li
authors.affiliation: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. yuanxb@mail.sim.ac.cn.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Yuan
mesh_terms: D000162:Acoustics; D000465:Algorithms; D003199:Computer Systems; D004867:Equipment Design; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D018986:Motor Vehicles; D009068:Movement; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013997:Time Factors; D014584:User-Computer Interface