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首页> 外文期刊>Journal of guidance, control, and dynamics >Methodology for Satellite Formation-Keeping in the Presence of System Uncertainties
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Methodology for Satellite Formation-Keeping in the Presence of System Uncertainties

机译：存在系统不确定性时的卫星编队保持方法

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摘要

A two-step formation-keeping control methodology is proposed that includes both attitude and orbital control requirements in the presence of uncertainties. Based on a nominal system model that provides the best assessment of the real-life uncertain environment, a nonlinear controller that satisfies the required attitude and orbital requirements is first developed. This controller allows the nonlinear nominal system to exactly track the desired attitude and orbital requirements without making any linearizations/approximations. In the second step, a new additional set of closed-form additive continuous controllers is developed. These continuous controllers compensate for uncertainties in the physical model of the satellite and in the forces to which it may be subjected. They obviate the problem of chattering. The desired trajectory of the nominal system is used as the tracking signal, and these controllers are based on a generalization of the concept of sliding surfaces. Error bounds on tracking due to the presence of uncertainties are analytically obtained. The resulting closed-form methodology permits the desired attitude and orbital requirements of the nominal system to be met within user-specified bounds in the presence of unknown, but bounded, uncertainties. Numerical results are provided, showing the simplicity and efficacy of the control methodology, and the reliability of the analytically obtained error bounds.
机译：提出了两步编队保持控制方法，该方法包括在存在不确定性的情况下的姿态和轨道控制要求。基于提供对现实生活中不确定环境的最佳评估的标称系统模型，首先开发了满足所需姿态和轨道要求的非线性控制器。该控制器允许非线性标称系统精确跟踪所需的姿态和轨道要求，而无需进行任何线性化/近似处理。在第二步中，开发了一组新的闭合形式的加性连续控制器。这些连续的控制器补偿了卫星物理模型以及卫星可能承受的力的不确定性。他们消除了of不休的问题。标称系统的期望轨迹用作跟踪信号，并且这些控制器基于滑动面概念的概括。通过分析获得由于不确定性的存在而导致的跟踪误差范围。最终的封闭形式方法可以在存在未知但有界不确定性的情况下，在用户指定的范围内满足标称系统的所需姿态和轨道要求。提供了数值结果，显示了控制方法的简单性和有效性，以及分析得出的误差范围的可靠性。

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  • 来源
    《Journal of guidance, control, and dynamics》 |2014年第5期|1611-1624|共14页
  • 作者

    Firdaus E. Udwadia; Thanapat Wanichanon; Hancheol Cho;

  • 作者单位

    University of Southern California, Los Angeles, California 90089-1453,Departments of Aerospace and Mechanical Engineering, Civil Engineering, Mathematics, and Information and Operations Management, 430K Olin Hall;

    Mahidol University, Puttamonthon, Nakorn Pathom 73170, Thailand;

    Samsung Techwin Company, Limited, Gyeonggi-do 463-400, Republic of Korea;

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