高频大地电磁系统数据处理方法研究  

The Research on High-frequency Magnetotelluric System's Data Processing Technique

作　　者：化希瑞[1] 曹哲明[1] 刘铁[1] 段圣龙[1] 

机构地区：[1]铁道第四勘察设计院

出　　处：《工程地球物理学报》2009年第S1期25-32,共8页Chinese Journal of Engineering Geophysics

摘　　要：EH-4系统的数据处理仍依赖于DOS界面下的数据采集和处理软件IMAGEM,不仅使用不便,而且有效频点少、频率分布不均匀、抗干扰能力差。本文在剖析EH-4系统数据处理流程的基础上,正确地读取了EH-4系统原始时间序列文件,引入Hilbert-huang变换分析时间序列,压制噪音,然后采用周期图方法重新计算了自功率谱、互功率谱和张量阻抗分量,以及由阻抗定义的视电阻率,重构阻抗文件的频点数约是原始阻抗文件的6倍,极大地增加了纵向数据密度,提高了分辨率和解释可靠性。实例应用表明了方法的正确、有效和可靠,具有推广价值。EH-4 system's data processing mostly depends on IMAGEM which is manufacturer's software. IMAGEM is inconvenient because of working in DOS interface,and some disadvantages such as low-resolution,asymmetrical frequency distribution,which cannot effectively suppress disturb. On the basis of studying EH-4 data processing,the paper reads time-sires file correctly,adopts Hilbert-Huang transform(HHT) to process MT signal,suppresses noise,and then adopts periodogram means to recalculate auto-power spectrum,cross-power spectrum and tensor impedance component,and recalculate resistivity depending on tensor impedance component. Compiling proprietary software-EH4 Data Processing Program,the quantity of reorganization impedance file is 6 times more than that of the original file and so it confirms the resolution and interpretation. According to the actual EH-4 data analysis,the result is consistent with actual geological condition and proves that the program is feasible and valuable.

关 键 词：EH-4系统 数据处理 HILBERT-HUANG变换 噪声压制 纵向数据密度 

分 类 号：P631.4[天文地球—地质矿产勘探]