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本文提出一个提高多道地震信号分辨率的处理方法——展谱法。该方法首先利用多道地震记录进行地震信号的检测,求出地震信号振幅谱的峰值频率f_,并换算成主频f_d;然后把地震信号的谱改变成以f_d为极值的对称三角形谱;再把此三角形谱的主频f_d向高频方向移动k倍,频带同时扩展到k倍,得到分辨率提高了(k-1)倍的地震信号;最后按检测的地震信号时窗中心点的位置及各道的时差把分辨率提高了(k-1)倍的信号送回相应的位置上,把无信号处充零,于是得到分辨率可控制的(由k决定)而且无随机噪声的高分辨率地震记录。
This paper presents a method to improve the resolution of multi-channel seismic signals - spectrum method. In this method, multi-channel seismic records are firstly used to detect the seismic signals and the peak frequency f_ of the amplitude spectrum of the seismic signals is calculated and converted to the dominant frequency f_d. Then, the spectrum of the seismic signals is changed to a symmetrical triangular spectrum with f_d as the extreme value. And then the triangular spectrum of the dominant frequency f_d to the high-frequency direction of k times the frequency band also expanded to k times the resolution of the (k-1) times the seismic signal; Finally, according to the detected seismic signal window time center The position and each channel’s time difference send the signal with the resolution (k-1) times higher to the corresponding position, and zero the signal without signal so that the resolution is controlled (determined by k) and there is no random noise High-resolution seismic records.