中文摘要：

大地电磁法主要依据视电阻率及相位曲线的形态特征来分析大地电性分布，因此阻抗张量的计算十分重要。在实际探测中，噪声的存在使得计算得到的阻抗张量往往存在一定的偏差，干扰了数据解释的准确性。本文概述了大地电磁阻抗张量计算方法的发展，首先介绍了现在常用的几种大地电磁阻抗计算方法及其不足之处，然后介绍了如何利用两种Jackknife方法来判断阻抗估计的稳定性。

英文摘要：

Magnetotelluric method is mainly used to analyze the electrical distribution based on the morphological characteristics of apparent resistivity and phase curve, so the impedance tensor calculation is very important. In the actual detection, noise always disturbs the result of this transfer function in detection. In this paper we outline the recent progress of magnetotelluric impedance estimation. At first we studied several kinds of impedance estimation methods now commonly used, and then introduced two kinds of Jackknife methods which could calculate the stability of error bars of the transfer function.