SignaI detection method for AC geo-resistivity observation
Ma Xiaoxi
Zhang Yu
Wang Lanwei
Zhang Xingguo
Abstract：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.
Keywords：geo-resistivity observationAC geo-resistivity methodfrequency selective receivernumerical simulation
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 853-864 )