Adaptive Fixed-Time 6-DOF Coordinated Control of Multiple Spacecraft Formation Flying with Input Quantization
Adaptive Fixed-Time 6-DOF Coordinated Control of Multiple Spacecraft Formation Flying with Input Quantization
复制标题
输入量化的多航天器编队飞行自适应定时六自由度协调控制
DOI：
10.1155/2020/6672709
复制
发表时间：
2020-12-30
期刊：
影响因子：
2.3
通讯作者：
Wen, Lihua
中科院分区：
文献类型：
--
作者：
Wang, Shiyu;Liu, Ruixia;Wen, Lihua
研究了具有输入量化的多航天器编队飞行（SFF）六自由度（6-DOF）动力学模型的固定时间协调控制问题，其中通信拓扑假设为有向.首先，利用邻域状态信息推导出一种新的多航天器非奇异固定时间终端滑模向量。其次，利用滞后量化器量化控制力和转矩。利用这种量化器不仅可以降低所需的通信速率，而且可以消除由对数量化器引起的控制抖动现象。第三，提出了一种具有自适应整定律的6自由度固定时间协调控制策略，使得被控系统在两个未知外部扰动上界存在的情况下都能保证实际的固定时间稳定性。从理论上证明了姿态和位置的相对跟踪误差可以在一定时间内收敛到该区域内。最后，一个数值例子被利用来显示理论结果的有用性。
This paper investigates the fixed-time coordinated control problem of six-degree-of-freedom (6-DOF) dynamic model for multiple spacecraft formation flying (SFF) with input quantization, where the communication topology is assumed directed. Firstly, a new multispacecraft nonsingular fixed-time terminal sliding mode vector is derived by using neighborhood state information. Secondly, a hysteretic quantizer is utilized to quantify control force and torque. Utilizing such a quantizer not only can reduce the required communication rate but also can eliminate the control chattering phenomenon induced by the logarithmic quantizer. Thirdly, a 6-DOF fixed-time coordinated control strategy with adaptive tuning laws is proposed, such that the practical fixed-time stability of the controlled system is ensured in the presence of both upper bounds of unknown external disturbances. It theoretically proves that the relative tracking errors of attitude and position can converge into the regions in a fixed time. Finally, a numerical example is exploited to show the usefulness of the theoretical results.