关键词: 微小卫星, 单轴指向, 主动磁控, 空间几何分析

Abstract:

A control strategy for single axis pointing of micro-satellites is proposed which uses only magnetictorquers. This method is useful in satellites′ safe modes and other specific situations. It contains the following steps: firstly, a geometry algorithm is utilized to extend the collection of the rotation axis to a plane, along which the current and target directions can coincide; secondly, an angle acceleration plane is found by affine transaction from the perpendicular plane of the local geomagnetic field with the satellite′s inertial matrix; thirdly, a controller that works along the intersecting line of the rotation axis plane and the angle acceleration plane is constructed to control both the rotating direction and the speed. Compared with the existing methods, this new method has advantages such as no additional disturbance from magnetic torque, less limitation from orbit shape as well as inertia products need not to be zero. The performance of the controller is validated in simulation, in which the Sun pointing and the Earth pointing with single axis are realized.

Key words: Micro satellite, Single axis pointing control, Active magnetic control, Geometry analysis