基于磁场梯度张量的航天器内部多磁场源探测技术

基于磁场梯度张量的探测技术具有高分辨率、高精度等优点,是航天器多磁源分辨的有效方法。文章建立了航天器磁场源模型,提出了航天器多磁场源模型拟合方法,利用磁场梯度张量的主不变量的极值确定磁场源个数和水平位置,然后联合欧拉方程计算磁场源深度,完成航天器内部多磁场源仿真与计算,分辨率最高可达0.012 m,满足工程需求。该研究开辟了航天器内部多磁场源目标探测的新途径。

Detection technology of multi-magnetic source in spacecraft based on magnetic field gradient tensor

The multi-magnetic source resolution in spacecraft is a difficult problem in the field of magnetic survey. The technology based on the magnetic gradient tensor can be used for high resolution and high precision detection. In this paper, a spacecraft magnetic source model is established, and a multi-magnetic source model fitting method for spacecraft is proposed. The principal invariants of the magnetic field gradient tensor are used to determine the number and the horizontal location of the source, and the Euler equations are combined to complete the multi-magnetic source depth calculation, with best resolution up to 0.012 m, meeting the engineering requirements. The study opens up a new way of the multi-magnetic source target detection in spacecraft.