可控源音频大地电磁观测资料预处理方法  

Data preprocessing methods for controlled source audio frequency magnetotelluric method

作　　者：葛双超 Ge Shuangchao(School of Instrument and Electronics,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,太原030051

出　　处：《电子测量技术》2021年第9期71-76,共6页Electronic Measurement Technology

基　　金：国家自然科学基金(41904080);山西省重点研发计划(201903D121118)项目资助。

摘　　要：可控源音频大地电磁法(CSAMT)是一种重要的电磁勘探方法。由于CSAMT法频带范围较宽,野外作业过程中容易受噪声干扰影响。针对这一问题,研究了CSAMT法观测资料实时处理方法。主要介绍了发射频率表的设计方法、全相位分析方法、数据处理中的异常值判断和剔除方法等。综合利用多种误差检验法以及异常极值识别方法,实现了强干扰下的卡尼亚视电阻率和相位测量。野外试验证明,所提出的数据处理方法能够从信噪比很低的原始数据中提取有效的卡尼亚视电阻率和阻抗相位,有助于提高CSAMT法的抗干扰能力,扩大其应用范围。As an important electromagnetic surveying method,controlled source audio frequency magnetotelluric(CSAMT)method is operated within a very broad bandwidth,so observational data is vulnerable to varies noise.To solve this problem,real-time data processing method for CSAMT was studied is this paper.The frequency table design method,all-phase analysis,and the judgment and elimination of abnormal value were discussed.Cagniard resistivity and phase measurement under strong disturbances was achieved by integrated utilization of multiple error inspection method as well as anomalous extremum value identification method.Field tests confirmed that the data processing method described can extract effective Cagnia apparent resistivity and impedance phase from the original data with very low SNR,helping to improve the anti-interference capability and expand the application scope of CSAMT.

关 键 词：CSAMT 数据采集 异常识别 误差检验 对比试验 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]