Given the complex environment experienced in working mines, the vibration waves produced by processes such as rock fracture in deep formations usually show interference effects when monitored due to other signals, the so-called “clutter” in the signal, which are interfered with the clutter. At the same time, owing to the influence of system noise, the first arrival time and the arrival time difference values of the signals obtained cannot easily be determined accurately. The propagation model for the microseismic signals experienced and the discrimination method used to determine the first arrival wave type can be established using knowledge of the spatial geometry between the sensors used and the seismic source. Thus, the filtering of the actual from the abnormal wave signals is possible. Using the theory of signal cross-correlation in this work, a correction method for the arrival velocity of the first microseismic signal has been proposed and evaluated. By calculating the cross-correlation coefficient of the same source vibration signal and finding the position that corresponds to the maximum value of the cross-correlation coefficient, the arrival time difference between the signals seen in the two channels is obtained. Thus, the key conclusions can be drawn from the experiments carried out: when the signal-to-noise ratio of the original signal is low, the time difference can still be determined with high accuracy. Further, a wave velocity correction criterion has also been proposed, where the velocity correction of the S wave or the R wave can be realized by combining the spatial coordinate information on the blasting point and an algorithm representing the signal cross-correlation to arrival time difference is used.

中文翻译：

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微震信号初到波类型的确定及波速校正方法

考虑到工作矿井所经历的复杂环境，深层岩层破裂等过程所产生的振动波在受到其他信号（信号中所谓的“杂波”）的干扰时，通常会显示出干扰效应。 。同时，由于系统噪声的影响，所获得的信号的第一到达时间和到达时间差值不容易准确地确定。可以使用所使用的传感器和地震源之间的空间几何形状知识来建立所经历的微地震信号的传播模型和用于确定第一波类型的判别方法。因此，可以从异常波信号中对实际信号进行滤波。利用这项工作中的信号互相关理论，已经提出并评估了第一微地震信号到达速度的校正方法。通过计算相同源振动信号的互相关系数并找到与互相关系数的最大值相对应的位置，可以获得在两个通道中看到的信号之间的到达时间差。因此，可以从进行的实验中得出关键结论：当原始信号的信噪比较低时，仍可以高精度确定时间差。此外，还提出了一种波速校正标准，