摘要
分析了传统"延迟求和"波束形成(beamforming)相控空间扫描原理,并进行了仿真实验研究,仿真表明由于旁瓣、栅瓣等问题的存在使信号源方位识别不准确。针对此问题本文提出了一种基于beamforming方向图矩阵进行声源定向的方法,理论分析和实验表明该方法能够有效地提高分辨率,提高定位的准确性,并基于该原理提出了用于工程的算式。
The principle of phased-microphone array was analyzed to identify signal sources on the basis of the delay-and-sum beamforming; and simulation research was carried out. Simulation result shows that the signal source location cannot be identified exactly because grating lobes and side lobes exist when sound source identification is carded out using phased-microphone array with delay-and-sum beamforming algorithm. A method was brought forward to identify signal source direction, which is based on beamforming pattern matrix to reduce bad effect of grating and side lobes; simulation calculation was carried out using two sound source models. Theoretical and experimental study shows that this method is effective for improving the resolution ability and the precision of location. In the end, the calculation formula is given, which is based on the proposed method and can be applied in practical application.
出处
《电子测量与仪器学报》
CSCD
2007年第5期40-44,共5页
Journal of Electronic Measurement and Instrumentation
基金
铁道部科技发展计划项目资助
项目名称:200/km铁路噪声控制技术研究(编号:2004Z005)
关键词
传感器阵列
波束形成
信号源定向
方向图矩阵
microphone array, beamforming, signal source direction, pattern matrix.
