| 利用IGRF模型计算全张量地磁梯度 | 
| 钟炀, 管彦武, 石甲强, 肖锋 | 
| The calculation method of full tensor geomagnetic gradient based on IGRF model | 
| Yang ZHONG, Yan-Wu GUAN, Jia-Qiang SHI, Feng XIAO | 
| 图1 地理坐标系与地心坐标系 | 
| Fig.1 Geographic coordinate system and geocentric coordinate system | 
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