Estimation of uncooperative space debris inertial parameters after tether capture
Estimation of uncooperative space debris inertial parameters after tether capture
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DOI：
10.1016/j.actaastro.2022.07.041
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发表时间：
2022-08
影响因子：
3.5
通讯作者：
Derek Bourabah;Liam Field;E. M. Botta
中科院分区：
文献类型：
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作者：
Derek Bourabah;Liam Field;E. M. Botta
空间碎片通常不合作且反应迟钝，因此需要了解其运动，以便在主动碎片清除任务中成功捕获后控制。为此，必须估计捕获的碎片物体的惯性张量，当追踪器和目标之间的连接不刚性时（例如通过系绳实现时），这尤其具有挑战性。在这项工作中，通过扩展卡尔曼滤波器和无迹卡尔曼滤波器，使用目标旋转速率的测量来估计系留碎片的主惯性矩。分析了两种情况，其中（i）追踪器-系绳-目标系统经常受到系绳松弛的影响，以及（ii）系绳几乎持续拉紧。通过蒙特卡罗模拟分析滤波器的性能。事实证明，假设了解系绳中的张力和碎片上的系绳附着点，可以很好地估计两个主要惯性矩。研究发现，虽然扩展卡尔曼滤波器能够估计转动惯量，但由于其最终转动惯量估计的方差较大，因此其不足。相反，无味卡尔曼滤波器能够在系留捕获碎片后获得精确且准确的惯性矩估计。
Space debris is often uncooperative and unresponsive, necessitating the understanding of its motion for successful post-capture control in an active debris removal mission. To this end, the inertia tensor of the captured debris object must be estimated, which is particularly challenging when the connection between chaser and target is not rigid, such as when achieved through a tether. In this work, the principal moments of inertia of tethered debris are estimated by means of Extended Kalman Filters and an Unscented Kalman Filter, using measurements of the rotational rates of the target. Two cases are analyzed in which (i) the chaser–tether–target system is subject to frequent tether slackness and (ii) the tether is almost continuously taut. The performance of the filters are analyzed via Monte-Carlo simulations. It is demonstrated that two of the principal moments of inertia can be estimated well, assuming knowledge of the tension in the tether and of the tether attachment point on the debris. It is found that, although the Extended Kalman Filter is capable of estimating the moments of inertia, it is inadequate due to the large variance of its final moment of inertia estimates. The Unscented Kalman Filter, instead, is capable of obtaining precise and accurate estimates of the moments of inertia after tethered capture of debris.