Experimental Researches on the Threshold of Airborne Gravity Data Denoising Based on DB Wavelet Transform
详细信息
- 责任者：Luo Feng (China Aero Geophysical Survey and Remote Sensing Center for Land and Resources ; Beijing 100083 ; China) ; Guo Zhihong
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：37(4)
- 关键词：小波变换 ; wavelet transform ; 去噪 ; denoising ; 航空重力测量 ; aerogravity surveys
- 页码：p.645-654
- 图表：illus., 3 tables, 16 refs.
- 分类号：1600
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
This paper proposes a method to compute the DWT(discrete wavelet transform) coefficients using Mallat’s fast algorithm with Daubechies N(N = 1,…,10) wavelet series as the wavelet primary function.The authors verified the reliability of the method with a theoretical model.By using an approach to multi-layer decomposition and a strategy of threshold value in the process of the airborne gravity data denoising,the authors extracted the free air gravity anomalies by the frequency and bandwidth character of the gravity anomalies.A comparison is made by using six,seven and eight layers decomposition and by employing the soft-threshold and the hardthreshold denoising.The results demonstrate that the free air gravity anomalies extracted by this method are quite consistent with the filtered results of the GT-1A system.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |