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三阶累积量在可控震源勘探信号处理中的应用
The Application of Three-Order Cumulant in the Processing of Vibrator Data
【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。
【Abstract】 Controlled vibrator shallowlayer seismic exploration data are mixed with strong environment noise. In order to raise the level of depressing noise, this paper tries using threeorder cumulant as mathematics tool of vibrator signal processing. First the threeorder crosscumulant of launched signal and received signal is calculated, then this threeorder crosscumulant is linearly decomposed based on the threeorder 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 timedelays. The results of experiment show that method of threeorder cumulant can detect the reflected signals accurately from received signal whose SNR is 0 dB and estimate their timedelays precisely. Because highorder statistics has the virtue of depressing Gauss noise, as the experiment result shows, the method of threeorder cumulant can show a good effect in processing vibrator signal which is better than that of traditional method of correlation.
- 【文献出处】 系统工程与电子技术 ,Systems Engineering and Electronics , 编辑部邮箱 ,2003年11期
- 【分类号】TN911.7
- 【被引频次】8
- 【下载频次】100