Experimental Researches on Fir Lowpass Filter Based on Equiripple

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：2012
• 卷期：36(5)
• 关键词：航空重力测量 ; aerogravity surveys
• 页码：p.856-860
• 图表：2 illus., 3 tables, 8 refs.
• 分类号：1600
• issnNo：ISSN1000-8918
• isbnNo：CN11-1906/P

摘要

This paper aims at solving the extraction of weak gravity anomaly signal under strong noise background, which is one of the key techniques in airborne gravity survey. Remez exchange algorithm design linear phase FIR low-pass filter was employed according to equiripple Chebyshev approximation theory, and model data were used to verify the effectiveness of the method. GT-1A airborne gravity system measurement data were utilized to conduct filter test. It is shown that the same results as the GT-1A system Kalman smooth filter can be obtained on the basis of the Remez exchange algorithm design linear phase FIR equiripple low-pass filter in the free air gravity anomaly under certain conditions.