电子学报 ›› 2019, Vol. 47 ›› Issue (10): 2235-2240.DOI: 10.3969/j.issn.0372-2112.2019.10.027

• 科研通信 • 上一篇    下一篇

嵌入式平面麦克风阵列TDOA校正方法

赵兆, 王旭, 许志勇   

  1. 南京理工大学电子工程与光电技术学院, 江苏南京 210094
  • 收稿日期:2019-02-01 修回日期:2019-06-03 出版日期:2019-10-25
  • 通讯作者: 许志勇
  • 作者简介:赵兆 男,1979年8月生于湖北省襄阳市.现为南京理工大学电子工程与光电技术学院副教授.主要研究方向为声探测系统与信号处理.E-mail:zhaozhao@njust.edu.cn;王旭 男,1995年7月生于安徽省宿州市.南京理工大学硕士研究生.主要研究方向为声探测系统与信号处理.E-mail:116104000650@njust.edu.cn
  • 基金资助:
    国家自然科学基金(No.61401203); 中央高校基本科研业务费专项资金(No.30918012203); 国防预研项目(No.41413010401)

Correction of TDOA for Embedded Planar Microphone Arrays

ZHAO Zhao, WANG Xu, XU Zhi-yong   

  1. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China
  • Received:2019-02-01 Revised:2019-06-03 Online:2019-10-25 Published:2019-10-25

摘要: 针对嵌入式安装麦克风阵列因壳体遮挡部分阵元而导致的实际波达时间差(TDOA)偏离直达波理论模型问题,基于实际声探测系统最常用的对称凸多边形平面阵型构造线性几何约束并结合秩2代数约束,提出了一种校正实测TDOA矩阵的凸优化闭式解,只要阵列结构中存在至少一对等长平行线,就能获得现有TDOA校正方法所没有的壳体遮挡衍射效应抑制能力,同时还能抑制随机误差和异常值的不利影响,实现复杂度低,更适用于日益普及的小型实时全向声探测系统应用.仿真结果验证了该方法的有效性.

关键词: 麦克风阵列, TDOA校正, 衍射传播效应, 嵌入式平面阵列, 线性几何约束, TDOA矩阵, TDOA异常

Abstract: In order to diminish the deviation of far-field time-difference-of-arrival (TDOA) measurements from the ideal line-of-sight (LOS) model due to some microphones shadowed by the system shell of an embedded planar microphone array,which is not considered and cannot be resolved by existing TDOA correction studies,a novel convex optimization method was proposed for correcting the measured TDOA matrix.A closed-form solution was obtained by integrating the rank-2 algebraic constraint with a set of linear geometric constraints corresponding to the equilong parallel lines (EPLs) that are easily achieved in practical acoustic detection systems using approximately symmetric convex polygons as preferable array shapes.As long as the array shape contains at least one pair of linearly independent EPLs,the proposed method gains the capability of effectively suppressing the diffraction induced deviations in measured TDOAs relevant to non-line-of-sight (NLOS) array elements.Meanwhile,the adverse effects of measurement noise and TDOA outliers can be also mitigated.Considering both the above capabilities and the low computational complexity,the proposed method is more suitable for ever-growing applications of small-scale,real-time acoustic detection systems.Numerical simulations verified its effectiveness.

Key words: microphone array, time-difference-of-arrival correction, diffraction propagation effect, embedded planar array, linear geometric constraint, time-difference-of-arrival matrix, time-difference-of-arrival outlier

中图分类号: