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从本质上来说，能否得到大地电磁响应函数的无偏估计，取决于实测电磁场时间序列中所含噪声的类型和强度。当磁场时间序列不含噪声且电场仅含不相关噪声时，单站ＲｏｂｕｓｔＬＳ方法是有效的；当磁场和电场时间序列同时含有不相关噪声时，Ｒｏｂｕｓｔ远参考方法也是有效的；但当磁场和电场时间序列含较强的相关噪声时，已有的方法已无能为力。文中在简要回顾大地电磁法的发展历史之后，对国外估计大地电磁响应函数的方法作了较全面的总结和评述，并着重介绍了几种值得关注的新方法。应该指出，受欢迎的方法必须兼顾估计的精度、稳定性和野外工作效率。
In essence, the unbiased estimation of the MT response depends on the type and intensity of the noise contained in the measured EMF time series. The single station RobustLS method is effective when the time series of the magnetic field is free from noise and the electric field contains only uncorrelated noise. RobustLS is also effective when the magnetic field and the electric field time series contain uncorrelated noise. However, when the magnetic and electric fields Existing methods have been powerless when time series contain strong correlated noise. After a brief review of the history of the development of the magnetotelluric law, this paper summarizes and comments on the methods of estimating the magnetotelluric response in other countries abroad, and highlights several new methods worthy of attention. It should be noted that popular approaches must take into account the accuracy, stability and efficiency of field work.