摘要
研究了在不同噪声强度、不同参考道、噪声仅存在基站或参考站时,远参考处理对测深曲线的影响.通过对标准时间序列进行仿真模拟,发现基站含不同信噪比的非相关噪声,远参考大地电磁对测深曲线提升效果不一:高信噪比(SNR=10.58 d B)条件下,远参考大地电磁能够较完美的恢复测深曲线,低信噪比(SNR=0.2 d B)条件下,远参考大地电磁对测深曲线质量提升效果有限;相同噪声仅存在于基站或者参考站对资料处理效果有区别:噪声仅存在于参考站的处理效果比仅存在于基站的效果要好;参考站无噪声情况下,电道或者磁道作为参考道对处理结果影响不大;基站与参考站之间的磁场相关性、基站磁场噪声与参考站磁场的非相关性与远参考处理效果关系密切.通过对实际资料的计算也有上述结论.
Precise and accurate determination of the magnetotelluric（ MT） impedance is fundamental to valid interpretation. This paper studies the effect of remote reference magnetotellurics on the sounding curve under different noise intensities,different reference channels and when the noise is only present at a base station or reference station. Through the standard time series simulation, this study finds that base stations with different signal-to-noise ratio of the noise,the improve effect of magnetotelluric sounding curve is differ,high signal-to-noise ratio（ SNR = 21. 3 d B）,the remote reference magnetotelluric sounding curve could resume more perfect,however,low signal-to-noise ratio（ SNR = 0. 2 d B）,the improvement effect is limited; Both high SNR and low SNR,the impedance phase quality improvement is not obvious; The same noise exists only in base station or reference station for data processing effect difference： noise exists only in reference station is better than only exist in the base station;Reference station, in the absence of any noise, with electric channel or magnetic channel as reference channel has little influence on the result of the sounding curves.
出处
《地球物理学进展》
CSCD
北大核心
2016年第6期2458-2466,共9页
Progress in Geophysics
基金
西南科技大学自然基金(15zx7135)
国家高技术研究发展计划(863计划)"长周期分布式大地电磁观测系统"(2014AA06A612)
国家重大科学仪器设备开发专项"大深度三维电磁探测技术工程化开发"(2011YQ05006007)联合资助
关键词
大地电磁
远参考
参考道
仿真模拟
magnetotelluric
remote reference
reference channel
simulation
