摘要
研究建立了次声监测节点和不同孔径的次声监测阵列,设计了消除风噪的花瓣式空间滤波器并实验验证了其降噪效果,建立了基于互联网数据库管理的次声实时监测系统,提出了基于改进STA/LTA算法的前兆次声信号提取方法和基于能量曲线与皮尔逊相关系数的前兆次声事件确认方法,使用改进的加权时延最小方差法对监测到的次声信号进行了声源定位,验证了定位的准确性;研究了次声传感器的相位校准技术,建立了试验样机,比较了试验结果和理论结果偏差,验证了次声相位校准的可行性。
In this article,infrasound monitor nodes and arrays in different dimensions are built. Rosette space filter for reducing wind noise is designed,and the experiment verifies the results of noise reduction. The monitor system for data management based on internet is established. The method for abnormal infrasound abstracting based on improved STA / LTA algorithm and the confirmation method based on energy curve and Pearson correlation coefficient are presented. The sound source position are estimated by modified weighting minimum delay variance method using monitor data,and the accuracy is identified by results. The phase calibration of infrasound transducer is studied,the prototype is built,the relative error between experiment and theory is compared,and the feasibility is validated.
出处
《计测技术》
2016年第5期9-13,共5页
Metrology & Measurement Technology
基金
中航工业集团创新基金资助项目(ZA7)
关键词
次声监测
系统设计
相位
校准
infrasound monitor
system design
phase
calibration
