三轴磁通门传感器水平和定向对地磁日变化观测数据的影响

Influencing factors of tri-axial fluxgate sensor horizontal and orientation on the accuracy of geomagnetic variation records

针对多套三轴磁通门传感器在同一观测环境下,日变化观测曲线不是完全重合,存在观测数据的不一致性问题,通过理论计算和地磁台站测试实验,分析仪器的定向、底座水平与地磁各分量观测数据之间的变化规律并给出其定量关系.实验结果表明:若存在定向误差角α,则表现为D分量的观测曲线中包含了一定比例的H分量;在水平面内,若存在磁传感器以H分量为轴在ZOD平面内的旋转夹角φ,则表现为D分量的观测曲线中包含了一定比例的Z分量;若存在磁传感器以D分量为轴在ZOH平面内的旋转夹角θ,则表现为H和Z两分量的记录数据中分别包含了一定比例的对方分量成分.

According to geomagnetic daily variation records of national geomagnetic observatory network of China,we analyze the observation data inconsistency by multiple sets of tri-axial fluxgate sensors in the same observation environment.Through theoretical calculations and experimental tests on the geomagnetic station,we got the quantitative relationships between instrument horizontal,orientation and each geomagnetic component.The experiment results show：if there is orientation error angleα,the D component observing curve contains a certain proportion of the Hcomponent;in the horizontal plane,if the angleφis fromed by magnetic sensor rotating around the H component as axis in the ZODplane,the Dcomponent observing curve contains a certain proportion of the Zcomponent;if the angleθis formed by magnetic sensor rotating around the D component as axis in the ZOH plane,the H and Zcomponent observation curves contain a certain proportion of each other component.