参考坐标系对Davis-Smith方法计算磁通门磁强计磁零点补偿值的影响

Effect of reference coordinate system on the offset of fluxgate magnetometer based on Davis-Smith method

为减小基于Davis-Smith方法进行磁通门磁强计在轨标定中存在的误差,利用数值仿真分析同一磁场波动在不同参考坐标系下用Davis-Smith方程获得零位补偿的误差特征,结果发现:同一波动在不同坐标系下的零位补偿误差差别极大;选取特定参考坐标系(相对于场向坐标系而言)可有效降低Davis-Smith方程的计算误差;一般而言,利用2个波动的磁场数据计算而产生的误差会比用单个波动的更小。了解这些零位补偿误差的分布特征将有助于挑选合适的磁场波动时段,从而提高磁通门磁强计在轨标定的精度。

To minimize the errors in the calibration of the fluxgate magnetometer with the David-Smith method,the error characteristics of the magnetic zero-offset determined by the Davis-Smith equation are simulated with the same magnetic field wave in different reference coordinate systems.It is found that the zerooffset error corresponding to the same wave in different coordinate systems can be very different.Selecting a specific coordinate reference system(relative to the field-aligned coordinate system)can effectively reduce the calculation error related to the Davis-Smith equation.The calculation error determined by using the data from two wave events tend to be significantly reduced compared with that by using a single wave event as the reference.Thus,the distribution characteristics of these zero-offset errors can be used for selecting an appropriate magnetic field wave period,thereby to improve the in-flight calibration accuracy of the fluxgate magnetometer.