地电阻率交流观测中信号检测方法研究  

Signal detection method for AC geo-resistivity observation

作　　者：马小溪[1,2] 张宇[1,2] 王兰炜[1,2] 张兴国[1,2] 

机构地区：[1]中国地震局地壳应力研究所,中国北京100085 [2]北京市地震观测工程技术研究中心,中国北京100085

出　　处：《地震学报》2015年第5期853-864,886,共12页Acta Seismologica Sinica

基　　金：国家自然科学基金(41374127);中国地震局地壳应力研究所基本科研业务专项(ZDJ2012-04)共同资助

摘　　要：目前我国地电阻率观测台站受地铁、轻轨等干扰的情况越来越多,严重影响地电阻率观测数据质量.地电阻率交流观测方法被认为是一种可以解决此类干扰问题的有效方法.本文首先介绍该观测方法的理论基础;然后采用数值模拟方法对实际观测过程进行模拟,给出在不同参数条件下,分别采用数字滤波器法、频谱分析法和相关检测法进行信号检测所得到的相对误差和相对均方差结果;最后,通过对3种信号检测方法进行比较和分析,给出频谱分析法在地电阻率交流观测中可以作为最佳信号检测方法的建议,为地电阻率交流观测系统的研制提供理论参考.In the past ten or twenty years,more and more geo-resistivity obser-vation stations are being faced with increasingly electromagnetic interference, such as subway and rail traffic system in urban area,which seriously affects the quality of observation data.The AC geo-resistivity observation method has been found to be effective to solve this problem and can be used for earthquake moni-toring and prediction.This paper introduced firstly the theory of the AC obser-vation method,and then three different signal detection methods,i.e .,the digital filter method,the spectrum analysis method and the correlation detection method,are used in the simulation.The analysis results are obtained by simula-ting an actual work process of AC geo-resistivity observation method.Compari-son of the relative error and relative standard deviation on the condition of different signal-noise ratio,sampling rate or sampling time shows that frequen-cy spectra method can be taken as the best method for the signal observation,providing theoretical basis for developing the AC geo-resistivity observation system.

关 键 词：地电阻率观测 地电阻率交流观测方法 选频接收 数值模拟 

分 类 号：P319.32[天文地球—固体地球物理学]