正交多项式法在航空电磁运动噪声去除中的应用  

The application of orthogonal polynomial fitting method to airborne electromagnetic motion noise removal

作　　者：黄威 贲放 吴珊 孙思源[4] 廖桂香[1,2,3] 西永在 HUANG Wei;BEN Fang;WU Shan;SUN Si-Yuan;LIAO Gui-Xiang;XI Yong-Zai(Laboratory of geophysical Electromagnetic Probing Technologies,Ministry of Land and Resources,Langfang 065000,China;Ministry of Natural Resources,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Science,Langfang 065000,China;National Research Centre of Geoexploration Technology,Langfang 065000,China;College of Geo-exploration Sciences and Technology,Jilin University,Changchun 130026,China)

机构地区：[1]自然资源部地球物理电磁法探测技术重点实验室,河北廊坊065000 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [3]国家现代地质勘查工程技术研究中心,河北廊坊065000 [4]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《物探与化探》2019年第4期892-898,共7页Geophysical and Geochemical Exploration

基　　金：国家重点研发计划(2017YFC0601900);基本科研业务费专项经费(JYYWF20180103);物化探所中央级公益性科研院所基本科研业务费专项资金资助项目(AS2017J06)联合资助

摘　　要：时间域航空电磁测量数据中常伴有表现出低频特性的运动噪声,其幅值远大于航空电磁探测系统的磁场强度,因此能否正确、高效地对其进行去除成为了时间域航空电磁数据预处理的关键问题。经过研究,本文采用正交多项式拟合方法对时间域航空电磁数据中的运动噪声进行去除。对数据中每个半周期时间序列利用正交多项式进行拟合,从而作差达到去除数据中运动噪声的目的。通过对理论数据和实测数据运动噪声去除的效果可以看出,正交多项式拟合方法可以有效的去除运动噪声,同时提升了航空电磁实测数据质量,提高了数据的信噪比。Time domain airborne electromagnetic measurement data are often accompanied by motion noise with low-frequency characteristics,whose amplitude is much stronger than the magnetic field intensity of the airborne electromagnetic response.Therefore,whether it can be removed correctly and efficiently has become a key technology in the pre-processing of airborne electromagnetic data in time domain.In this paper,orthogonal polynomial fitting method is used to remove the motion noise of airborne electromagnetic data in time domain.The orthogonal polynomials fitting method is used to fit each half-cycle time series so as to remove the motion noise.It can be seen from the result of removing motion noise from simulation data and real data that orthogonal polynomials fitting method can effectively remove motion noise,improve the quality of airborne electromagnetic real data,and improve the SNR of data.

关 键 词：时间域航空电磁法 数据预处理 运动噪声去除 正交多项式 

分 类 号：P631[天文地球—地质矿产勘探]