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余弦函数自适应法识别与消除单频干扰 被引量:12

Identification and suppression of single frequency interference by using cosine function adaptive method
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摘要 50Hz左右的强单频干扰波一直是人们的研究对象,现有的压制50Hz强单频干扰方法不同程度地存在计算效率低、运算费时、损害有效信号的缺陷。本文提出了余弦函数频率自适应算法快速估算单频干扰频率;采用时延自适应公式直接计算单频干扰时延;采用振幅公式直接计算单频干扰振幅。此法可以快速地估算出单频干扰频率,达到消除这种干扰的目的,并且不损害干扰附近的有效信号,提高了单频干扰频率分量附近数据的信噪比。合成数据和实际数据试算结果表明该方法是有效和可行的。 The strong single frequency interference around 50Hz has been always the study object in seismic data processing.The current software modules which are used to suppress 50Hz strong single frequency interference have some defects,such as low efficiency,large time-consuming during the calculation and being harmful to effective signals and so on.The cosine function adaptive algorithm which can be used to fast estimate the single frequency interference frequency was proposed in this paper.The time delay and the amplitude of the single frequency were calculated directly using time delay adaptive formula and amplitude formula respectively.The method is harmless for the nearby effective signals and can raise the signal to noise ratio of the data around the single frequency interference.With this method the frequency of the single interference can be fast estimated and the target of suppression of such interference was reached.The trial calculation results for the synthetic data and field data showed the effectiveness and feasibility of the method.
出处 《石油地球物理勘探》 EI CSCD 北大核心 2011年第1期64-69,164+170,共6页 Oil Geophysical Prospecting
关键词 单频干扰 余弦函数逼近 自适应法 信噪比 seismic acquisition,single frequency interference,signal to noise ration,cosine function approximation,adaptive method
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