利用改进泰勒级数法对磁异常场进行向下延拓

Downward Continuation of Magnetic Field Based on Improved Taylor Series

基于高精度的磁异常场垂向导数,提出采用改进泰勒级数法实现磁异常场的向下延拓。通过仿真试验数据对提出的向下延拓方法进行了验证,结果表明,该方法可实现磁异常场稳健向下延拓,其计算精度要优于目前常用的傅里叶变换法和常规泰勒级数法计算精度。

Based on the use of vertical derivatives with high precision, a stable algorithm was presented to perform downward continuation applying improved Taylor series approximation. The effectiveness of the suggested algorithm has been illustrated by simulated sphere/prismatic examples. The conclusion shows that the presented approach can be employed to perform stable downward continuation of total field magnetic data and provides better results than other approaches such as fast Fourier transformation （FFT） and normal Taylor series.