摘要
半航空瞬变电磁法(Semi-Airborne Transient Electromagnetic Method,SATEM)通过在地面布置发射源,在空中接收信号,是一种新兴的地球物理勘探方法.在数据采集过程中,由于接收线圈持续运动和摆动,产生较大的运动噪声,导致采集的数据不能直接使用.同时,瞬变电磁只在关断之后进行数据采集,获得的数据是非全时的,为数据预处理过程中的运动噪声去除带来困难.为有效去除非全时半航空瞬变电磁数据中的运动噪声,本文首先将非全时电磁数据延拓至全时长,基于傅里叶级数构造了半航空瞬变电磁晚期数据运动噪声超定线性方程组,通过最小二乘反演求解运动噪声,并将所获得运动噪声从原数据中剔除.通过对仿真数据和实测数据进行去噪,其能够有效识别并剔除数据中的运动噪声,去噪效果良好.
The Semi-Airborne Transient Electromagnetic Method(SATEM)is an emerging geophysical exploration method,which can receive signals in the air by arranging emission sources on the ground.In data collection,due to the continuous movement and swing of the receiving coil,a considerable motion noise is generated,resulting in collected data that not be used directly.Simultaneously,the transient electromagnetic only collects data after the turn-off,and the obtained data is non-full-time,which brings great difficulties to the removal of motion noise in the data preprocessing process.To effectively remove the motion noise in the non-full-time semi-airborne transient electromagnetic data,the method proposed in this paper first extends the non-full-time electromagnetic data to the full-time.Then,based on the Fourier series structure to solve the overdetermined linear equations of semi-airborne decay curve late motion noise,the motion noise is solved by least-squares inversion.By denoising the simulation data and the measured data,it can effectively identify and eliminate the motion noise in the data.
作者
杨洋
张衡
周长宇
陈成栋
孙怀凤
YANG Yang;ZHANG Heng;ZHOU ChangYu;CHEN ChengDong;SUN HuaiFeng(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;Laboratory of Earth Electromagnetic Exploration,Shandong University,Jinan 250061,China;Advanced Exploration and Transparent City Innovation Center,Shandong Research Institute of Industrial Technology,Jinan 250061,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第6期2351-2364,共14页
Chinese Journal of Geophysics
基金
国家自然科学基金(42004056,42074145)
山东省自然科学基金(ZR2020QD052,ZR2019MD019)联合资助。
关键词
半航空瞬变电磁法
运动噪声
傅里叶级数
最小二乘
Semi-Airborne Transient Electromagnetic Method(SATEM)
Motion noise
Fourier series
Least squares
