低纬度化极应用迭代法的技术条件分析

摘要

针对现有的磁赤道地区磁异常迭代化极方法进行了分析,重点研究了迭代计算中的关键因素——映射函数的选择对迭代收敛性的影响,通过改变映射函数将其推广到除赤道外的其它低纬度条件的化极,并进一步给出了不同磁纬度地区的收敛条件.经过模型计算和实测磁异常验证,改进后的方法既适用于磁赤道也同样适用于其它低纬度地区,并且在保证化极效果的基础上提高了迭代计算的效率.%This paper analyses the iterative method used in the RTP at the magnetic equator, focusing on the key factor in the iteration; the choice of mapping function of the raw data to the target data. This method is extended to other low latitude regions by changing the mapping function, and the condition of convergence at different magnetic latitudes is given. Applications to synthetic and field magnetic data sets show that the improved method is effective for both the other low-latitude regions and the magnetic equator, and the efficiency of the iterative calculation is improved.