EH-4系统中工频干扰的处理与改进  

An improved method to Eliminate the Power-Line Interference in the EH-4 system

作　　者：席振铢[1] 龙霞[1] 董晨[2] 王鹤[1] 何彬 

机构地区：[1]中南大学信息物理工程学院,长沙410083 [2]铁道第三勘察设计院,天津300251 [3]劳雷工业有限公司,北京100020

出　　处：《地球物理学进展》2010年第3期1105-1109,共5页Progress in Geophysics

基　　金："十一五"国家科技支撑计划项目(2006BAB01B07)资助

摘　　要：EH-4系统处理50 Hz工频干扰的方法一是在采集数据时进行硬件陷波,二是在利用标定文件标定功率谱时进行数字陷波.这两种陷波在没有工频干扰时会过度丢失有用信息,在强干扰下陷波不彻底,且没有对三次以上高次谐波进行压制.针对这两点不足,本文采用在50 Hz及其谐波影响频段范围内设置0权值的改进parzen窗加权平均法来取代IMAGEM窄带等权平均法对功率谱进行平滑估算,从而有效消除工频干扰.实例应用表明该方法简单有效,可以提高数据质量.Elimination of EH-4 system＇s power-line interference mostly depends on 50 Hz hardware notch in the receiver, and 50 Hz, 100 Hz, 150 Hz digital notch when its software IMAGEM performs the calibration. The two notch methods will make much useful information lost when there is no power-line interference. While when the power-line interference is strong, neither method does the elimination well enough, and neither eliminates the spikes of the high order harmonics of 50 Hz. Aiming at the two drawbacks, instead of the common equal weights average method used by IMAGEM, weighted-average method with zero weight on 50 Hz frequency bands and its harmonics is adopted to smooth the power spectrum. The processing result on actual EH-4 measured data proves that the improved method is feasible and valuable.

关 键 词：EH-4系统 工频干扰 高次谐波 0权值 PARZEN窗 功率谱平滑 

分 类 号：P631[天文地球—地质矿产勘探]