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井口声发射井筒液油气浸入定位中，通过环空内压力传感器接收反射声信号的频域分析，求其协方差矩阵特征结构，本文提出了一种信号多时间延迟快速估计方法。计算机模拟实验证实了方法的有效性．
In wellhead acoustic emission wellbore liquid-oil immersion positioning, the frequency domain analysis of the reflected acoustic signal received by annulus pressure sensor is used to find its covariance matrix structure. A fast multi-time delay estimation method is presented in this paper. Computer simulation experiments confirmed the effectiveness of the method.