北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (1): 29-37.doi: 10.13700/j.bh.1001-5965.2019.0108

• 论文 • 上一篇    下一篇

基于方向和距离的双因子定权的地磁数据通化方法

刘晓刚1,2, 徐婧林1,3, 管斌1,2, 马健1,2, 段渭超1,2   

  1. 1. 地理信息工程国家重点实验室, 西安 710054;
    2. 西安测绘研究所, 西安 710054;
    3. 西北工业大学 自动化学院, 西安 710072
  • 收稿日期:2019-03-18 发布日期:2020-01-21
  • 通讯作者: 刘晓刚 E-mail:liuxiaogang_1949@163.com
  • 作者简介:刘晓刚,男,博士,副研究员。主要研究方向:地球重磁场探测技术及数据处理。
  • 基金资助:
    国家重点研发计划(2018YFC1503806);国家自然科学基金(41774018);西北工业大学博士论文创新基金(CX201814);地理信息工程国家重点实验室开放研究基金(SKLGIE2017-Z-3-2,SKLGIE2018-ZZ-4)

Bifactor weight determination method based on direction and distance in geomagnetic data assimilation

LIU Xiaogang1,2, XU Jinglin1,3, GUAN Bin1,2, MA Jian1,2, DUAN Weichao1,2   

  1. 1. State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China;
    2. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China;
    3. School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2019-03-18 Published:2020-01-21
  • Supported by:
    National Key R & D Program of China (2018YFC1503806); National Natural Science Foundation of China (41774018); Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX201814); Open Research Foundation of State Key Laboratory of Geo-Information Engineering (SKLGIE2017-Z-3-2, SKLGIE2018-ZZ-4)

摘要: 针对地磁数据通化处理中传统使用的直接平均法、反距离加权平均法和纬度差加权平均法在定权时存在的缺陷,并根据地磁场强度与纬度变化关系密切这一特点,提出了基于方向和距离的双因子定权方法,即在定权时不仅考虑了地磁台站之间的距离在权值中的贡献,而且在权值分配中加入了地磁台站在纬度和经度方向的影响,从而改进了通化结果的精度,为卫星、航空和海洋磁力测量数据提供更加准确的日变改正值。采用Intermagnet网站提供的地磁台站测量数据对所提定权方法的有效性进行了测试。实验结果表明:所提定权方法计算结果精度优于传统定权方法,为实施地面磁力测量存在困难地区的地磁数据日变改正提供了一种更优的定权方法,具有较好的应用前景。

关键词: 地磁场, 地磁台站, 日变改正, 双因子定权, 相关性系数

Abstract: In the geomagnetic data assimilation, we analyze the weight determination weakness of the direct average method, reverse distance weighting average method and latitude difference weighting average method which are widely used in the previous work. Considering the geomagnetic field strength has a close relationship with the changing of latitude, we propose a bifactor weight determination method based on the direction and distance. Concretely, it not only utilizes the distances among the geomagnetic observatories but also takes into account the changes from the latitude and longitude directions simultaneously, which assigns the different weights to the above three factors to improve the precision of geomagnetic data assimilation and obtain the more precise diurnal variation correction for the satellitic, airborne and seaborne geomagnetic measurement data. Furthermore, we use the geomagnetic observatory data supplied by Intermagnet website to validate the proposed method. The experimental results demonstrate that the proposed method is superior to the existing methods in the accuracy of calculation result. Thus, this paper proposes a novel and reliable weight determination method which has a potential application in the diurnal variation correction of geomagnetic measurement data in the regions where the ground survey is implemented difficultly.

Key words: geomagnetic field, geomagnetic observatory, diurnal variation correction, bifactor weight determination, correlation coefficient

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