信号方向约束叠后噪声压制

目前叠后随机噪声压制方法众多,但去噪效果往往过于依赖剖面信噪比本身,从而在提高剖面高频段信噪比方面发生困难,难以真正展宽输出剖面高频段有效频带。方向约束叠后噪声压制方法在高频段有效信号的估计中,用易于求取的信噪比相对较高的低频段有效信号方向来约束。这样做的结果,使高频段有效信号的估计更加准确,能更好地改善去噪效果,从而达到拓宽有效频带的目的。

Post-stack noise suppression using signal direction restriction

There are many post-stack noise suppression methods,but their noise suppression effect excessively depends on the signal/noise ratio of seismic section. Consequently, people have difficulty in raising the signal/noise ratio of high-frequencycontents of seismic section,so that the effective high frequency band of output seismic section can not be broadened desirably. In the post-stack noise suppression using signal direction restriction,the estimation of high-frequency effective signals isrestrained by using direction of low-frequency effective signals which have high signal/noise ratio. As a result, we accurately estimate the effective signals in high frequency band and better the noise suppression, thus broadening the effective frequency band.