动态环路法磁矩测量技术研究

文章提出了一种新的航天器磁矩测量方法——动态环路法。首先,利用高斯电势级数公式建立了航天器的磁性偶极-四极模型。然后,针对模型中的8个磁矩分量,基于动态环路法的基本测量原理,设计了5组磁通感应线圈;根据8个磁矩分量的磁感应强度分布以及5组线圈的具体形状和位置,给出了各磁矩分量的磁通量表达式和利用积分法计算各个磁矩分量的公式。最后,对在推导过程中由于简化带来的近似误差和利用积分法计算公式理论计算误差进行了初步分析。当线圈间隔L为半径r的5%时,近似误差和积分法理论计算误差分别不超过2%和0.17%。结果表明,该方法不但能够获得航天器的磁矩大小并计算出其磁心坐标,而且还具有测量过程简单、测量速度较快以及测量精度高的优点。

Dynamic loop method for measuring the magnetic moment

In this paper,a new method of measuring the spacecraft magnetic moment is proposed.Firstly,a new spacecraft magnetism model is established in the Gauss expressions.Secondly,based on the characteristics of the model,five groups of induction coils are designed,and the magnetic flux expressions of each magnetic moment components are obtained with related calculation formula.Finally,the error of the approximation produced in the derivation process of the magnetic flux expressions and the theoretical error produced when the integration is used to deal with the measurement data are analyzed.The results indicate that the dynamic loop methods not only can measure the magnetic moment and the magnetic center of spacecraft perfectly,but also has some advantages such as simple measurement process,faster measuring speed and better precision.The error of the approximation is not more than 2% and the theoretical error of integration is 0.17% when the value of L is equal to 5% of the radius of the coil.