双体卫星对日定向姿态机动控制

研究了双体卫星(DFP)对日定向姿态机动控制问题。首先分析双体卫星工作机理，建立载荷舱与平台舱姿态模型，推导磁浮机构线圈和磁钢相对距离的数学表达式。提出基于PD控制的载荷舱对日姿态机动、平台舱姿态跟踪以及两舱避碰等控制策略。在此基础上，为提高平台舱姿态跟踪速度，设计反步控制器对平台舱飞轮的动态特性进行补偿。进一步，为提高两舱协同控制性能，对传统PD控制进行改进，提出基于变增益PD控制的载荷舱姿态机动控制律，将两舱相对姿态信息包含在载荷舱对日姿态机动控制律中，有效降低了两舱碰撞风险，提高了两舱姿态机动速度。仿真结果表明，本文控制算法能有效实现双体卫星对日定向，且能避免两舱碰撞。

Sun Pointing Attitude Maneuver Control of a Two Body Satellite

The sun-pointing attitude maneuver control of a two-body satellite with an architecture of disturbance free payload (DFP) is investigated. According to the work mechanism of the DFP, the attitude model of the DFP is established and the relative motion between the magnet steels and the coils of maglev actuators is derived. The sun-pointing attitude maneuver strategy for the payload and the attitude tracking strategy for the platform based on PD control are proposed. The relative position control algorithm is presented to avoid collision. To improve the platform dynamic performance, the backstepping control algorithm is presented to compensate for the dynamic characteristic of the flywheels. To improve the cooperativity between the platform and the payload, the variable gain PD controller when considering relative attitude between the payload and the platform is proposed for the payload attitude maneuver. The simulation results show that the algorithms proposed in this paper can achieve the goal of sun-pointing control of the satellite with an architecture of DFP and the collision is avoided.