改进的互功率谱相位法在雷声声源定位中的应用

发布时间：2018-06-07 17:07

本文选题：信噪比 + 多分叉闪电　；参考：《应用气象学报》2014年02期

【摘要】：互相关函数法是一种常用的时延估计方法,但在低信噪比和闪电存在多分叉的情况下,该方法的效果不理想。针对这一问题,该文选取广州地区2009年8月24日19:08:04和2012年5月5日08:01:00的两次闪电过程的雷声记录,结合高速摄像资料,比较了互相关函数法和改进的互功率谱相位法在雷声声源定位中的应用效果。首先,利用互相关函数法和改进的互功率谱相位法计算声源点的方向信息,定位结果与高速摄像照片对比具有较好的一致性,证明了定位方法的可靠性,对比结果表明:在低信噪比环境和多分叉闪电情况下,改进的互功率谱相位法能够获得比互相关函数法更好的定位效果。最后给出了综合利用改进的互功率谱相位法计算得到的方向信息和声源点与观测点的距离信息得到的雷声声源三维定位结果。
[Abstract]:The cross correlation function method is a common time delay estimation method, but the effect of this method is not satisfactory under the condition of low signal to noise ratio and multi bifurcation of lightning. In view of this problem, this paper selects the lightning record of two lightning passes in 19:08:04 and May 5, 2012 of August 24, 2009 in Guangzhou area, and compares it with high speed camera data. The cross correlation function method and the improved cross power spectrum phase method are applied in the localization of the acoustic source. First, the cross correlation function method and the improved cross power spectrum phase method are used to calculate the direction information of the source point. The positioning results are in good agreement with the high speed photograph contrast, and the reliability of the positioning method is proved and the comparison results are proved. It is shown that the improved mutual power spectrum phase method can obtain better positioning effect than cross correlation function method in the condition of low signal to noise ratio environment and multi bifurcation lightning. Finally, the three-dimensional location of the sound source obtained by using the improved mutual power spectrum phase method to calculate the direction information and the distance information of the sound source point and the observation point is given. Result.
【作者单位】：成都信息工程学院电子工程学院;中国气象科学研究院灾害天气国家重点实验室;中国气象科学研究院雷电物理和防护工程实验室;深圳市气象服务中心;
【基金】：国家自然科学基金项目(41075003,41030960,41205002) 中国气象科学研究院基本科研业务费专项资金(2010Z004)
【分类号】：TN912.3

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