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地震资料的数字处理,一项重要的技术任务是提高讯噪比。本文介绍一种改善讯息的方法,即相似放大。原理是:利用有用讯息与随机干扰在强度上的差异,提取有用讯息;利用有用讯息与随机干扰在波形上及其在相邻记录道上重复性的差异,求取一个反映波的相似程度的加权系数,以此再处理记录道上各类讯息。因而相似的有用讯息为之放大,无用的随机干扰随之削弱。本方法的主要特点,在于提高有用讯息与随机干扰的反向差,同时从技巧上保真有效波放大后不失真,不脱节,在讯息改善上有较好的效果。
Digital processing of seismic data, an important technical task is to improve the signal to noise ratio. This article describes a way to improve the message, that is, similar to zoom. The principle is: to extract the useful information by using the differences in intensity between the useful information and the random interference; to use the difference between the useful information and the repetitiveness of the random interference on the waveform and its adjacent tracks to obtain a weighted similarity Coefficient, in order to deal with all kinds of information on the track. As a result, similar useful messages are magnified, and useless random interference is weakened. The main feature of this method is to improve the reverse difference between the useful information and the random interference. At the same time, the fidelity of the effective wave is not distorted after the amplification is magnified, and it is not out of line with the better effect of improving the message.