EXPERIMENTAL RESEARCHES ON FIR LOWPASS FILTER BASED ON EQUIRIPPLE
LUO Feng1,2, GUO Zhi-hong1,2, LUO Yao1,2, WANG Ming1,2
1. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China; 2. Laboratory of Earth Observation Technology, China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
Abstract：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.
罗锋, 郭志宏, 骆遥, 王明. 航空重力数据的等波纹FIR低通滤波试验[J]. 物探与化探, 2012, 36(5): 856-860.
LUO Feng, GUO Zhi-hong, LUO Yao, WANG Ming. EXPERIMENTAL RESEARCHES ON FIR LOWPASS FILTER BASED ON EQUIRIPPLE. Geophysical and Geochemical Exploration, 2012, 36(5): 856-860.
[1] 熊盛青. 我国航空重磁勘探技术现状与发展趋势[J].地球物理学进展,2009,24(1):113-117.[2] 郭志宏,罗锋,安占峰.航空重力数据窗函数法FIR低通数字滤波实验[J].物探与化探,2007,31(6):568-571.[3] 郭志宏,罗锋,王明,等.航空重力数据无限脉冲响应低通数字滤波器设计与试验研究[J].地球物理学报,2011,54(8):2148-2153.[4] 李文勇,周坚鑫,郭志宏,等.航空重力构造分层方法[J].地球物理学进展,2010,25(5):1641-1647.[5] 孙中苗. 航空重力测量中FIR低通滤波器的设计与应用[J].解放军测绘学院学报,1996,13(4):247-250.[6] Rabiner L R,McClellan J H,Parks T W. FIR digital filter design techniques using weighted Chebyshev approximation[J].Proc IEEE,1975,63(4):595-610.[7] 陈佩青.数字信号处理教程[M]. 北京:清华大学出版社,2003:368-380.[8] 孙中苗,夏哲仁. FIR低通差分器的设计及其在航空重力测量中的应用[J].地球物理学报,2000,43(5):850.
