基于FI-W算法对瞬变电磁法探测煤矿采空区数据的降噪  

Denoising the data of transient electromagnetic method(TEM)detecting coal mine goaf based on the FI-W algorithm

作　　者：戚庭野[1] 冯国瑞[1] 郭育霞[1] 

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《地球物理学进展》2014年第4期1741-1747,共7页Progress in Geophysics

基　　金：国家自然科学基金面上项目(51174142);国家科技支撑计划项目(2009BAB48B02);教育部新世纪优秀人才支持计划资助项目(NCET-11-1036);霍英东教育基金2011年高等院校青年教师基金应用研究课题(132023);山西省科技攻关项目(20110321015-03)联合资助

摘　　要：利用瞬变电磁法在煤矿采空区实际探测中,接收到衰减的二次感应电动势,其中中晚期的信号受噪声的干扰较大,信噪比低,不能有效真实地反映采空区的情况.本文通过对快速独立分量分析(FastICA)和小波阈值算法的改进,提出了FIW算法步骤,进而对TEM中晚期信号降噪计算,整个FI-W运算过程利用MATLAB程序.FI-W计算后的数据与其它降噪算法处理后的数据对比,分析得出FI-W算法提高了信噪比,处理后的曲线更接近于理想的衰减曲线;将测线上每个测点中晚期信号选取一部分数据用FI-W算法处理后,用GRAPHER软件形成多测道曲线,根据异常点确定采空区的位置,并钻孔验证,证实:通过多测道曲线确定的异常点位置与实际钻孔确定的采空区位置一致.经过FI-W算法降噪计算后的TEM中晚期数据能真实地反映采空区的位置.Transient electromagnetic（TEM）is used to detect the coal mine goaf,by receiving induction electromotive force attenuation signal,the middle-late signal is interfered by the noise,and shows the low signal noise ratio（SNR）,it can’t effectively reflect the area of the goaf.In the paper,FastICA and wavelet threshold algorithm were improved,FI-W was put forward,which was used to reduce the noise of middle-late signal,the calculation process was in the Matlab program.Independent FastICA,independent wavelet threshold and the average of the three related data were also made used of reducing the noise.FI-W algorithm in contrast with the other three operation means,FI-W algorithm can improve signal noise ratio,the curve was more close to the ideal decay curve.The middle-late signal of each point in the measuring line was calculated with the FI-W algorithm,then we draw many measuring way curve by GRAPHER software.According to abnormal points to determine the position of the goaf,and drilled,the goaf was found.It proved the feasibility of the FIW algorithm for transient electromagnetic signal noise reduction.

关 键 词：FASTICA 小波阈值 FI-W 瞬变电磁接收信号 降噪 

分 类 号：P631[天文地球—地质矿产勘探]