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基于高阶统计 ,提出了井口声发射井筒液气浸检测中的接收和发射声信号之间时延估计的非参数化和参数化方法。通过分析声信号在井筒液中的传播过程 ,井口声发射井筒液气浸检测中的接收噪声 ,可近似模型化为空间相关的高斯色噪声。由于四阶累积量对任意高斯噪声的盲目性 ,因此 ,较常规互相关估计方法 ,这些方法可以进一步提高检测概率。计算机模拟结果证实了它们的有效性。
Based on the high-order statistics, a nonparametric and parameterized method for estimating the time delay between the received and transmitted acoustic signals in the wellbore acoustic emission wellbore liquid immersion test is proposed. By analyzing the propagation of acoustic signals in the wellbore fluid, the received noise in the borehole acoustic emission well liquid immersion test can be modeled as spatially correlated Gaussian color noise. Due to the fourth-order cumulant’s blindness to arbitrary Gaussian noise, the conventional cross-correlation estimation methods can further improve the detection probability. Computer simulation results confirm their validity.