基于相关系数的海底大地电磁阻抗Robust估算方法

对于海洋的特殊环境，常规的阻抗估算方法往往不能很好地估算海底大地电磁的阻 抗张量，本文提出了基于相关归一Robust方法. 以相关系数为参数对阻抗张量元素进行归一，据相关系数值的变化修正Robust的权系数. 模拟和实测数据的计算表明，相关归一Robust法比其他常规方法更能有效地抑制干扰. 噪声强度小于30%时常规方法和新方法都能有效 地估算阻抗张量；噪声强度大于50%时，常规方法估算误差明显偏大，新方法误差要小得多，反映出该方法有较强抗干扰的能力.

ROBUST ESTIMATION METHOD OF SEA MAGNETOTELLURIC IMPEDANCE BASED ON CORRELATIVE COEFFICIENT

For the sea environment, traditional impedance estimation does not work well, a new Robust method based correlative coefficient is proposed in this paper. Normalizate impedance and correct weigth of Robust by correlative cofficient. Theoretical modeling and field data show that our method can remove noise better than others. For the case the N/S is low 30%, thougth traditional and new impedance estimation can work well, new method is of low error, the N/S is over 50%, the new method works much better than the traditional estimation and the regular Robust method.