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Minimum Switching Thruster Control for Spacecraft Precision Pointing

机译：航天器精确指向的最小切换推进器控制

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摘要

Maintaining the attitude of a spacecraft precisely aligned to a given orientation is crucial for commercial and scientific space missions. The problem becomes challenging when on/off thrusters are employed instead of momentum exchange devices due to, e.g., wheel failures or power limitations. In this case, the attitude control system must enforce an oscillating motion about the setpoint, so as to minimize the switching frequency of the actuators, while guaranteeing a predefined pointing accuracy and rejecting the external disturbances. This paper develops a three-axis attitude control scheme for this problem, accounting for the limitations imposed by the thruster technology. The proposed technique is able to track both the period and the phase of periodic oscillations along the rotational axes, which is instrumental to minimize the switching frequency in the presence of input coupling. Two simulation case studies of a geostationary mission and a low Earth orbit mission are reported, showing that the proposed controller can effectively deal with both constant and time-varying disturbance torques.
机译：保持航天器的姿态精确对准给定方向对于商业和科学航天任务至关重要。当由于例如车轮故障或功率限制而使用开/关推进器而不是动量交换装置时，该问题变得具有挑战性。在这种情况下，姿态控制系统必须强制执行围绕设定值的振荡运动，以最小化执行器的开关频率，同时保证预定义的指向精度并消除外部干扰。考虑到推进器技术的局限性，本文针对此问题开发了一种三轴姿态控制方案。所提出的技术能够沿着旋转轴跟踪周期性振荡的周期和相位，这有助于在存在输入耦合的情况下最小化开关频率。报告了对地静止任务和低地球轨道任务的两个仿真案例研究，表明所提出的控制器可以有效地处理恒定和随时间变化的扰动扭矩。

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