基于PRT-TFPF的地震勘探数据中高频信号的增强技术

吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (增刊1): 472-476.

基于PRT-TFPF的地震勘探数据中高频信号的增强技术

张洁^1,2, 李月¹, 吴宁¹

1. 吉林大学通信工程学院,长春 130012;
2. 吉林大学学报(信息科学版)编辑部,长春 130012

收稿日期:2012-09-17 发布日期:2013-06-01
通讯作者: 李月(1958-),女,教授,博士生导师.研究方向:地震勘探信号处理、微弱信号检测.E-mail: liyue@jlu.edu.cn E-mail:liyue@jlu.edu.cn
作者简介:张洁(1981-),女,博士研究生,编辑.研究方向:地震勘探信号处理. E-mail:z_jie@jlu.edu.cn
基金资助:
国家自然科学基金资助项目(41130421).

Enhancement technology of high frequency signal in seismic data based on PRT-TFPF

ZHANG Jie^1,2, LI Yue¹, WU Ning¹

1. College of Communication and Engineering, Jilin University, Changchun 130012, China;
2. Editorial Department of Journal, Jilin University(Information Science Edition), Changchun 130012, China

Received:2012-09-17 Published:2013-06-01

摘要/Abstract

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。

关键词: 时频峰值滤波, 径向轨线, 瞬时频率估计, Wigner-Ville分布

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.

Key words: time-frequency peak filteringand(TFPF), radial trace, instantaneous frequency estimation, Wigner-Ville distribution(WVD)

中图分类号:

P631

张洁, 李月, 吴宁. 基于PRT-TFPF的地震勘探数据中高频信号的增强技术[J]. 吉林大学学报(工学版), 2013, 43(增刊1): 472-476.

ZHANG Jie, LI Yue, WU Ning. Enhancement technology of high frequency signal in seismic data based on PRT-TFPF[J]. 吉林大学学报(工学版), 2013, 43(增刊1): 472-476.

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