低秩及几何约束的嵌入式阵列膛口波测向方法

doi:10.3969/j.issn.1000-1093.2019.03.014

兵工学报 ›› 2019, Vol. 40 ›› Issue (3): 555-560.doi: 10.3969/j.issn.1000-1093.2019.03.014

低秩及几何约束的嵌入式阵列膛口波测向方法

王旭，赵兆，许志勇

(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:2018-03-27 修回日期:2018-03-27 上线日期:2019-04-29
通讯作者: 许志勇(1968—), 男, 副教授, 博士生导师 E-mail:ezyxu@mail.njust.edu.cn
作者简介:王旭(1995—), 男, 硕士研究生。E-mail: 116104000650@njust.edu.cn
基金资助:
国家自然科学基金项目（61401203），中央高校基本科研业务费专项项目（30918012203）

DOA Estimation of Muzzle Blast for an Embedded Microphone Array Using Low-rank and Geometric Constraints

WANG Xu， ZHAO Zhao， XU Zhiyong

(School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

Received:2018-03-27 Revised:2018-03-27 Online:2019-04-29

摘要/Abstract

摘要： 针对部分阵元受壳体遮挡导致的小型嵌入式麦克风阵列枪声探测系统目标定位偏差问题，提出了一种枪声膛口波测向新方法。该方法通过分析非通视传播对阵元间波达时间差（TDOA）的不利影响，采用低秩及几何约束下的凸优化校正算法抑制实测TDOA矩阵中的随机噪声和衍射传播偏差；同时选取距离目标最近的通视麦克风作为参考阵元，进一步减小最小二乘测向偏差的统计均值与方差。外场试验结果表明，膛口波测向误差不大于实际产品指标要求的累积概率，由常规方法的0.86提升至新方法的0.94.

关键词: 麦克风阵列, 方向估计, 枪声探测, 衍射效应, 误差校正

Abstract: An estimation method for direction of arrival (DOA) of muzzle blast is proposed to solve the shell-induced deviation problem in target orientation estimation of a partially shaded microphone array embedded in a small-aperture gunshot detection system. The adverse effect of non-line-of-sight (NLOS) propagation on the time difference of arrival (TDOA) is analyzed, and a convex optimization algorithm with low-rank and geometric constraints is devised to correct TDOA matrix for simultaneously suppressing the influence from both diffraction propagation and random noise. The non-shaded microphone closest to the target is chosen as the reference microphone. The statistical mean and variance values of least squares DOA estimation error are obviously decreased. The experimental results obtained using a real embedded planar array system demonstrate that the proposed method provides superior muzzle blast DOA estimation performance compared with the conventional approach, by which the cumulative probability of estimation error meeting the requirement of practical products is improved from 0.86 to 0.94. Key

Key words: microphonearray, directionofarrivalestimation, gunshotdetection, diffractioneffect, errorcorrection

中图分类号:

O429
TJ012.2

王旭，赵兆，许志勇. 低秩及几何约束的嵌入式阵列膛口波测向方法[J]. 兵工学报, 2019, 40(3): 555-560.

WANG Xu， ZHAO Zhao， XU Zhiyong. DOA Estimation of Muzzle Blast for an Embedded Microphone Array Using Low-rank and Geometric Constraints[J]. Acta Armamentarii, 2019, 40(3): 555-560.

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低秩及几何约束的嵌入式阵列膛口波测向方法

DOA Estimation of Muzzle Blast for an Embedded Microphone Array Using Low-rank and Geometric Constraints

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