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Impact of atmospheric coupling between orbit and attitude in relative dynamics observability

机译：轨道与姿态之间的大气耦合对相对动力学可观测性的影响

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摘要

The OG has been employed as a tool to evaluate the degree of observability dependency on the dynamics of the relative dynamics of the spacecraft. It has been shown that the coupling, created by the atmospheric drag force for spacecraft in formation in LEO enables full observability of the state that is not possible without such coupling. Furthermore, the variation of the degree of observability has been shown when the altitude and spacecraft mechanical characteristics are changed. As a result, new elements on the gradient of the dynamics are appearing, creating a significant change on the observability of the system. The cases of limited observability, where only the relative position of the spacecraft or the relative attitude of the spacecraft are measured, are of special interest in this work. They show that full observability is achieved (not possible in the scenario under study without such coupling). These effects have been presented in previous works. This work proposed a method that allows a comparison of how different conditions may change the observability in a methodical way. This is in contrast to the use of the propagated estimating results as a comparison method, where other elements (such as the performance of the selected estimator itself) may have an influence on the result. The OG method enables the possibility to evaluate in advance which measuring configuration has a better observability performance due to coupling. This information is valuable for relative spacecraft dynamics estimation implementation, as well as the design of sensor suites for formation-flying missions.
机译：OG已被用作评估可观测性对航天器相对动力学动力学的依赖程度的工具。已经表明，由大气阻力在LEO中形成的航天器形成的耦合能够完全观察到没有这种耦合就不可能实现的状态。此外，当高度和航天器的机械特性发生变化时，可观察程度的变化已显示出来。结果，出现了动力学梯度上的新元素，从而对系统的可观察性产生了重大变化。在可观测性有限的情况下，仅测量航天器的相对位置或航天器的相对姿态的情况在这项工作中特别引起关注。他们表明可以实现完全的可观察性（如果没有这种耦合，则在所研究的场景中是不可能的）。这些效果已在以前的作品中介绍过。这项工作提出了一种方法，该方法可以比较不同条件如何有条不紊地改变可观察性。这与将传播的估计结果用作比较方法相反，在其他方法中，其他元素（例如所选估计器本身的性能）可能会对结果产生影响。 OG方法可以预先评估哪种测量配置由于耦合而具有更好的可观察性。该信息对于相对的航天器动力学估计实施以及用于编队飞行任务的传感器套件的设计都是有价值的。

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  • 来源
    《Journal of guidance, control, and dynamics》 |2017年第12期|3273-3280|共8页
  • 作者

    Chaves-Jiménez Adolfo; Guo Jian; Gill Eberhard;

  • 作者单位

    Delft University of Technology, Faculty of Aerospace Engineering, Kluyverweg 1, Delft, Netherlands;

    Delft University of Technology, Faculty of Aerospace Engineering, Kluyverweg 1, Delft, Netherlands;

    Delft University of Technology, Faculty of Aerospace Engineering, Kluyverweg 1, Delft, Netherlands;

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