A Comparison of Digital Lowpass FIR-Filters in Airborne Gravimetry
详细信息
- 责任者：Cai Shaokun (Mechatronics and Automation College ; National University of Defense Technology ; Changsha 410073 ; China) ; Wu Meiping
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2010
- 卷期：34(1)
- 关键词：航空重力测量 ; aerogravity surveys ; 滤波 ; filters
- 页码：p.74-78
- 图表：8 illus., 3 tables, 14 refs.
- 分类号：1600
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
There is a lot of noise in the data observed by airborne gravimeter. Digital lowpass FIR-filter is needed to extract the factual gravity field information from such data. Based on a set of real data of airborne gravimetry, the authors dealt with the determination of the cutoff frequency and filter length of the digital lowpass FIR-filter, and studied the method for deleting ineffectual data. Based on a comparison of the capabilities of filters designed by different window functions, it is concluded that, in airborne gravimetry, the digital lowpass FIR-filter designed by Hanning window and Haiming window can meet the requirement of extracting the gravity field information.