摘要
研究基于希尔伯特变换的时间延迟估计方法及其算法,算法通过MATLAB语言编程实现。制作了4块混凝土板并在其上开展基于冲击反射法的双传感器波速测量实验,将互相关时延估计和希尔伯特变换时延估计应用到波速估计中,两者均能解决直接观察法中的人为误差的影响和噪声对测量精度的影响,取得比较满意的结果,希尔伯特变换时延估计得到的波速精度比互相关时延估计得到的波速估计精度更高。
Hilbert transform of cross-correlation function based time delay estimation algorithm is studied in this paper. The algorithm was implemented with Matlab programming. 4 concrete slabs were constructed for experiments. Impact-echo experiments are carried out for measuring wave speed in concrete structure by two displacement transducers. Both the Hilbert transform based time delay algorithm and the cross-correlation function based time delay estimation algorithm have been applied to the wave speed evaluation. The influence of human observation error and noise are eliminated by both estimation methods. Experiment results are satisfied. The precision of the estimation by Hilbert transform is higher than that by cross-correlation function.
出处
《公路交通科技》
CAS
CSCD
北大核心
2004年第1期54-57,共4页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金(50275109)
交通部通达计划(95 06 02 04)资助项目
关键词
希尔伯特变换
时间延迟估计
波速测量
Hilbert transform
Time delay evaluation
Wave speed measurement
