【摘要】 传统时频峰值滤波(Time-Frequency Peak Filteringand,TFPF)在处理地震勘探记录中的高频有效信号时,会造成波形畸变和严重的能量损失。为此,本文将平行径向轨线时频峰值滤波(Parallel Radial Trace TFPF,PRT-TFPF)算法用于地震勘探数据的处理中。该方法对非线性程度较高的高频有效信号,通过径向轨线采样,使其频率降低,波形拉伸,在一个窗长内更近似满足TFPF无偏估计的条件,减小滤波带来的偏差,使信号滤波后得到更好地恢复。实验结果表明,主频为60 Hz有效信号的同相轴经该方法滤波后,信号波形不发生畸变,幅值得到保持,同相轴能连续清晰地得到恢复,信噪比较传统TFPF提高6.5 dB左右。更多还原

【Abstract】 During the high-frequency effective signal processing of seismic exploration records,the traditional Time-Frequency Peak Filtering(TFPF) may lead to wave distortion and large energy loss.In this paper,the Parallel Radial Trace Time-Frequency Peak Filtering(PRT-TFPF) arithmetic was adopted to process the seismic data.The proposed arithmetic has better performance to process the high-frequency effective signals with highly nonlinear degree by comparing with the TFPF method.The PRT-TFPF not only can decrease the signal frequency,stretch the wave form,but also can meet the unbiased estimation requirement in one data window lengthof TFPF,can reduce the energy loses of filtering process,which can take advantage of recovery of the signals.The results of the experiments on 60 Hz effective signal event show that the PRT-TFPF can remain the signal waveform without distortion,keep the amplitude,and recover the event continuously and clearly.By comparing the traditional TFPF,the Signal to Noise Ratio(SNR) of the proposed PRT-TFPF is improved by about 6.5 dB.更多还原