基于泰勒级数展开的低纬度磁异常化极方法研究  

Study on reduction to the pole of magnetic anomalies at low latitudes based on Taylor-series expansion

作　　者：张连伟 夏成龙 郭灿文 孙毅[1] 马永 ZHANG Lianwei;XIA Chenglong;GUO Canwen;SUN Yi;MA Yong(National Marine Data and Information Service,Tianjin 300171,China;Naval Research Institute,Tianjin 300061,China)

机构地区：[1]国家海洋信息中心,天津300171 [2]海军研究院,天津300061

出　　处：《海洋测绘》2023年第5期1-6,共6页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(42206200)。

摘　　要：为有效解决低纬度地区磁异常资料化极处理过程中存在沿垂直于磁偏角方向放大、拉伸高频干扰等问题,进而提高磁资料解释的精度,在总结前人提出的低纬度磁异常化极方法原理的基础上,对化极转换因子进行改造,提出基于泰勒级数展开的低纬度化极法。经单模型、多模型正演数据验证和实测数据应用分析,该方法在低纬度区域化极结果准确、可靠、精度更高,有效消除磁异常沿垂直于磁偏角方向拉伸的现象。本文提出的方法明显改善了低纬度地区磁异常化极效果。In order to effectively solve the problems of amplification and extension of high-frequency interference along the direction of magnetic declination in the process of reduction to the pole of magnetic anomaly data at low latitudes,and further improve the accuracy of magnetic data interpretation,this paper,on the basis of summarizing the principle of reduction to the pole method at low latitudes proposed by predecessors,modifies the reduction to the pole conversion factor,and proposes a new method based on Taylor-Series expansion.Through the verification of single model and multi-model forward data and the application analysis of measured data,this method is accurate,reliable and more accurate at low latitudes,and will not lead to obvious stretching of magnetic anomaly along the magnetic declination direction.The method presented in this paper has obviously improved the effect of reduction to the pole of magnetic anomalies at low latitudes.

关 键 词：磁异常 低纬度化极法 频率域 振幅谱 泰勒级数 

分 类 号：P229.24[天文地球—大地测量学与测量工程]