最新国际地磁参考场模型IGRF11研究

刘元元; 王仕成; 张金生; 郑玉航; 乔玉坤

doi:10.3969/j.issn.0253-3782.2013.01.013

Research on the eleventh generation IGRF

Accuracy Guidance and Control Laboratory of the Second Artillery Engineering College, Xi’an 710025, China

摘要

摘要: 详细阐述了国际地磁参考场模型IGRF11的建模原理、数据来源、球谐系数及误差来源等. 以NOAA/NGDC候选地磁场模型为例，分析了数据的选取原则和校正方法. 在MATLAB环境下，研制了该模型的可视化软件，为制备地磁仿真基准图提供了最有可能和最为便捷的途径，能有效使用国际公开数据，减少外场地磁实测工作量和成本，对地磁导航工程化具有重要的价值. 对模型检验值和实测值与模型计算值进行比较，结果表明，软件计算结果是正确的、可靠的；对IGRF11与WMM2010模型的异同点进行比较，结果表明， WMM2010的模型精度要高于IGRF11，具有更为广阔的适用范围. 最后，从模型长期变化估算角度入手，分析了引起IGRF11模型计算精度低的原因.
- 地磁场模型 /
- IGRF11 /
- WMM2010 /
- 球谐系数
Abstract: This paper expounds in detail the modeling principle, data sources, spherical harmonic coefficients and error sources of the 11th generation international geomagnetic reference field model (IGRF11). Taking the NOAA/NGDC candidate geomagnetic model as an example, an analysis is made on the data selection principle and calibration method. Under MATLAB environment, a visual software of the model was developed, providing the most possible and convenient way for making a geomagnetic reference map. This enables the effective use of international open data, and reduces the workload and cost of geomagnetic measurements, therefore, it is valuable for geomagnetic navigation. Comparing the test and measured values with the calculated value shows that the calculation results of the software are correct and reliable; and comparing IGRF11 with WMM2010 for their similarities and differences reveals that WMM2010 has higher accuracy and a wider scope of application than IGRF11. Finally, by estimating long-time variation, the reason for low calculation accuracy of IGRF11 is analyzed.
- magnetic model /
- IGRF11 /
- WMM2010 /
- spherical harmonic coefficient

HTML全文

图 1 WMM2010总磁场强度等值线图

Figure 1. Contour map of total field intensity of WMM2010

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图 2 IGRF11总磁场强度等值线图

Figure 2. Contour map of total field intensity of IGRF11

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表 1 数据的选择标准

Table 1 Data selection criteria

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表 2 实测数据修正

Table 2 Correction of experimental data

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表 3 单点位置磁场要素值

Table 3 Magnetic elements of a single spot

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表 4 误差分析

Table 4 Error analysis

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表 5 球谐系数的比较

Table 5 The spherical harmonic coefficients

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