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中文摘要：
为了提高算法在近场冲击源的定位精度,提出了基于多重信号分类（MUSIC）算法的复合材料近场冲击源定位方法。首先通过Fresnel近似将一维远场模型扩展到二维近场模型;接着应用Gabor小波变换从冲击的宽带信号中提取某一中心频率的窄带波;最后应用二维近场MUSIC算法,扫描整个监测区域,可以同时得到冲击源的距离和方位角。复合材料层合板的冲击实验结果表明该方法能够精确有效地对冲击源进行定位,距离的定位误差不超过0.94cm,方位角误差不超过1°。
英文摘要：
To improve the location precision of foreign object impact in the near-field,the multiple signal classification（MUSIC） based localization algorithm was presented for the impacts estimating.Firstly,classical far-field MUSIC algorithm was extended to near-field version using the Fresnel approximation.Then Gabor transform was applied to extract the narrow-band signal at a center frequency from the impact signal.After scanning over the whole interest direction of the structure,the signal source parameters including range and direction from the peak of spatial spectrum were obtained.The experiment on the epoxy laminates plate was established to verify the validity of the proposed method.Results show that the distance error and the direction error are less than 0.94 cm and 1o,respectively.
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