【摘要】 可控震源浅层地震勘探接收信号受环境噪声污染严重。为了提高压制噪声的能力,尝试用三阶累积量为数学工具,求出发射信号与接收信号的三阶互累积量,并把互累积量用发射信号自累积量进行线性分解。根据分解系数序列来检测接收信号中各反射信号分量的存在,并估计各反射信号分量的时间延迟。数值实验结果表明,该方法能从信噪比为0dB的接收信号中准确检测出反射信号分量并估计其时间延迟。鉴于高阶累积量具有屏蔽高斯噪声的优点,其用于可控震源地震勘探信号处理的效果比传统的相关方法要好。更多还原

【Abstract】 Controlled vibrator shallowlayer seismic exploration data are mixed with strong environment noise. In order to raise the level of depressing noise, this paper tries using threeorder cumulant as mathematics tool of vibrator signal processing. First the threeorder crosscumulant of launched signal and received signal is calculated, then this threeorder crosscumulant is linearly decomposed based on the threeorder cumulant of launched signal. In according to the coefficient series of decomposition, we can detect the reflected signals comprised in the received signal and estimate their timedelays. The results of experiment show that method of threeorder cumulant can detect the reflected signals accurately from received signal whose SNR is 0 dB and estimate their timedelays precisely. Because highorder statistics has the virtue of depressing Gauss noise, as the experiment result shows, the method of threeorder cumulant can show a good effect in processing vibrator signal which is better than that of traditional method of correlation.更多还原