| 摘要: |
| 海洋区域地质调查中，单道地震勘探以其高分辨率、方便快捷等优点成为揭示浅地层地质构造的重要手段之一.结合前人研究成果并出于保护信号的完整性，对低频部分的噪声采用带通滤波进行滤除，而对高频信号中的随机噪声采用小波阈值去噪方法进行压制处理.在小波阈值去噪过程中，通过比较选用最佳小波基函数sym5对地震剖面进行三层小波分解.结果表明：两种阈值去噪方法在带通滤波的基础上进一步提升了剖面的质量，使得反射层面变得连续可追踪.软阈值去噪滤掉了剖面上的较多信息，去噪效果较为彻底，硬阈值去噪则保留了较多的细节信息. |
| 关键词: 海洋地质学 单道地震 随机噪声 小波变换 小波基函数 |
| DOI：10.3969/J.ISSN.2095-4972.2018.01.013 |
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| 基金项目:极地专项资助项目(CHINARE01-03，CHINARE04-01，CHINARE03-03，CHINARE04-03)；海洋公益性行业科研专项资助项目(201305038) |
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| Application of wavelet transform for noise suppression in single-channel seismic data processing |
| LIN Zhao-bin,HU Yi,ZHENG Jiang-long,LIN Ai-jun |
| (Third Institute of Oceanography，SOA，Xiamen 361005，China;Third Institute of Oceanography，SOA，Xiamen 361005，China; Ocean University of China，Qingdao 266100，China) |
| Abstract: |
| Single-channel seismic exploration has become one of important means to reveal shallow geologic structure in marine geological investigations with its advantages of easy operation, high-efficient and low-cost. Based on previous research results and for the protection of the integrity of signal, the band-pass filter to filter out the random noise in the low-frequency signal and the wavelet threshold de-noising method to filter the random noise in the high-frequency signal is used. In the experiments, the sym5 wavelet is used to decompose the seismic profile by three layers of wavelet decomposition with soft and hard threshold de-noising. The results show that two threshold de-noising methods further enhance the quality of the section on the basis of the band-pass filter, which makes the reflection event become continuous tracking. The soft threshold de-noising method filters out more information on the profile, and the de-noising method effect is more thorough. And the hard threshold de-noising method retains more details. |
| Key words: marine geology single-channel seismic random noise wavelet transform wavelet basis function |
