用专家示范训练飞船对接,不依赖精确模型,更稳定可靠。
Imitation learning-based spacecraft rendezvous and docking method with Expert Demonstration
- 通过状态锚点约束解码器,让控制动作更符合物理规律。
- 在仿真中实现高精度、低能耗的六自由度对接,抗干扰能力强。
- 适合航天器自主对接场景,尤其适合建模困难的复杂环境。
现有航天器交会对接控制方法多依赖预设动力学模型,在真实轨道环境中鲁棒性有限。本文提出基于模仿学习的航天器交会对接控制框架(IL-SRD),直接从专家示范中学习控制策略,降低对精确建模的依赖。提出一种锚定解码器目标机制,将解码器查询条件化于与状态相关的锚点,显式约束控制生成过程,确保物理上一致的控制演化,有效抑制序列预测中的不合理动作偏差,实现可靠的六自由度(6-DOF)交会对接控制。为进一步提升稳定性,引入时间聚合机制,缓解基于Transformer模型的序列预测导致的误差累积问题,小误差在长时序下不会持续放大。大量仿真实验表明,所提IL-SRD框架实现了准确且节能的无模型交会对接控制。鲁棒性评估进一步验证其在显著未知扰动下仍保持优异性能。源代码已开源:https://github.com/Dongzhou-1996/IL-SRD。
原文摘要 · Abstract (English)
Existing spacecraft rendezvous and docking control methods largely rely on predefined dynamic models and often exhibit limited robustness in realistic on-orbit environments. To address this issue, this paper proposes an Imitation Learning-based spacecraft rendezvous and docking control framework (IL-SRD) that directly learns control policies from expert demonstrations, thereby reducing dependence on accurate modeling. We propose an anchored decoder target mechanism, which conditions the decoder queries on state-related anchors to explicitly constrain the control generation process. This mechanism enforces physically consistent control evolution and effectively suppresses implausible action deviations in sequential prediction, enabling reliable six-degree-of-freedom (6-DOF) rendezvous and docking control. To further enhance stability, a temporal aggregation mechanism is incorporated to mitigate error accumulation caused by the sequential prediction nature of Transformer-based models, where small inaccuracies at each time step can propagate and amplify over long horizons. Extensive simulation results demonstrate that the proposed IL-SRD framework achieves accurate and energy-efficient model-free rendezvous and docking control. Robustness evaluations further confirm its capability to maintain competitive performance under significant unknown disturbances. The source code is available at https://github.com/Dongzhou-1996/IL-SRD.
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