Abstract: Aiming at the problem that signal has low SNR in actual test environment and the noise impacts the accuracy of Time Delay Estimation(TDE), this paper provides a generalized correlation method and gives an algorithm using FFT to compute it. It is used in leakage detection of oil conveying pipeline. Experimental results illustrate that it can compute time delay of leakage signal arrive the pipeline two ends and the error is less than 2%. It promotes performance of correlation computing and detection precision.

Key words: leakage detection, Time Delay Estimation(TDE), generalized correlation

摘要： 针对实际检测环境中信号信噪比低，噪声影响时间延迟估计的精度的问题，提出广义互相关方法，并给出利用FFT快速求解算法。在输油管道泄漏检测中的应用结果表明，该方法能有效计算泄漏信号到达管道2端的时间差，计算泄漏点位置误差控制在2%以内，改善了相关运算的时延估计性能。

关键词: 泄漏检测, 时延估计, 广义相关

CLC Number: 

• N945