Formation flying solar-sail gravity tractors in displaced orbit for towing near-Earth asteroids
Formation flying solar-sail gravity tractors in displaced orbit for towing near-Earth asteroids
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编队飞行太阳帆重力拖拉机在移位轨道上拖曳近地小行星
DOI：
10.1007/s10569-009-9211-8
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发表时间：
2009-06
期刊：
影响因子：
--
通讯作者：
BaoYin, Hexi
中科院分区：
文献类型：
--
作者：
Gong, Shengping;Li, Junfeng;BaoYin, Hexi
文献中已经提出了几种小行星偏转的方法，其中引力拖拉机是一种利用引力耦合进行近地物体轨道修正的新方法。引力拖拉机的一个弱点是偏转能力受到航天器质量和推进剂的限制。为提高偏转能力，提出了编队飞行太阳帆引力拖拉机，并与单台太阳帆引力拖拉机的偏转能力进行了比较。结果表明，随着风帆数目的增加，轨道偏转可以大大增加。飞行太阳帆引力拖拉机的编队需要几个帆才能在小行星上方的一个小的移动轨道上进化。因此，应采取适当的控制，以保证重力式拖拉机的稳定和无碰撞。本文研究了两种控制策略：仅用推力调节的简单控制器实现的松散编队飞行和采用滑模控制器和平衡成形方法实现的紧凑编队飞行。松编队和紧编队的优点分别是其控制器的简单性和鲁棒性。
Several methods of asteroid deflection have been proposed in literature and the gravitational tractor is a new method using gravitational coupling for near-Earth object orbit modification. One weak point of gravitational tractor is that the deflection capability is limited by the mass and propellant of the spacecraft. To enhance the deflection capability, formation flying solar sail gravitational tractor is proposed and its deflection capability is compared with that of a single solar sail gravitational tractor. The results show that the orbital deflection can be greatly increased by increasing the number of the sails. The formation flying solar sail gravitational tractor requires several sails to evolve on a small displaced orbit above the asteroid. Therefore, a proper control should be applied to guarantee that the gravitational tractor is stable and free of collisions. Two control strategies are investigated in this paper: a loose formation flying realized by a simple controller with only thrust modulation and a tight formation realized by the sliding-mode controller and equilibrium shaping method. The merits of the loose and tight formations are the simplicity and robustness of their controllers, respectively.
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