然而，在振幅随炮检距变化的情况下，即当偏移距范围很大时，无论是反射波的振幅还是极性都发生了非常大的变化。
However, in the presence of amplitude variation with offset (AVO), and particularly at large offsets, reflection coefficients and polarities may differ significantly from those at normal incidence.
本文利用信号的横向相关性和信号振幅随炮检距变化的特征，提出一种既能提取有效反射信号同相轴，又能提取零炮检距道信号的方法。
A method for extracting both effective reflection events and zero-offset trace signals is developed using the lateral coherence and the property that signal amplitude changes with offset.
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