摘要
将基于重复中位数估计的Robust算法应用于长周期大地电磁阻抗张量估算中。与传统Robust估计(M估计)相比,重复中位数估计求解过程不需要重设参量,并且提高了算法对时间域原始资料中噪声干扰的容限,使算法的理论崩溃值从30%提高到50%,也能得到准确的估算结果。龙门山地区实测资料的处理结果表明,基于重复中位数估计的Robust算法应用于阻抗张量的求解具有较强的优越性。
With the broadband signal,weak signal energy and small magnitude in comparison with the tradition MT,the long-period magnetotelluric survey has a higher data processing requirement.In this paper,the Robust algorithm based on repeated median estimator was applied to long-period magnetotelluric impedance tensor estimates.Compared with the Robust maximum likelihood estimate（M estimate）,the repeated median estimator has no need of reset parameters in data processing,and can increase the estimate of the breakdown point up to 50% and get an unbiased estimate of impedance tensor.An application example shows that the Robust algorithm based on repeated median estimator has a strong advantage in the solution of the impedance tensor.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第6期813-816,828,共5页
Geophysical and Geochemical Exploration
基金
国家863高技术研究发展计划项目(2006AA06Z110)
