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Efficient Fast Open-Loop Attitude Control Strategy for Earth Imaging Nanospacecraft

机译：地球成像纳米航天器的高效快速开环姿态控制策略

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摘要

This paper proposes a computationally efficient attitude control strategy for nanospacecraft fast reorientation maneuvers. The paper considers a 3U CubeSat for visual Earth observation missions with deployable solar panels, equipped with three reaction wheels, three magnetorquers, and a miniature star imager, due to a 0.1 degrees stringent targeting requirement of the payload. The star imager is very accurate, but operational only at very small angular rates. Hence it cannot be used for attitude measurement during fast slewing maneuvers. The proposed attitude control strategy overcomes this limitation by implementing a combination of open-loop and closed-loop control schemes based on the simplifying assumption of negligible gyroscopic torques. This leads to a straightforward onboard computation of the control actions required by the reaction wheels, within the limits imposed by saturation, without solving complex and computationally intensive time-optimal solutions onboard, which would not be compatible with CubeSats. The open-loop control phase is followed by an accurate closed-loop phase, accurately pointing the spacecraft toward the target orientation. The strategy is validated by numerical simulations, including robustness with respect to system uncertainties, by Monte Carlo analysis. (C) 2017 American Society of Civil Engineers.
机译：本文提出了一种用于纳米飞船快速重新定向机动的高效计算姿态控制策略。由于有效载荷的0.1度严格瞄准要求，本文考虑使用3U CubeSat进行可视地球观测任务，该任务具有可展开的太阳能电池板，配备三个反作用轮，三个磁矩和一个微型星型成像仪。星型成像仪非常精确，但只能在很小的角速率下运行。因此，它不能用于快速回转操纵过程中的姿态测量。所提出的姿态控制策略通过基于可忽略的陀螺转矩的简化假设实现开环和闭环控制方案的组合，从而克服了这一限制。这样就可以在饱和所施加的限制范围内，对反作用轮所需的控制动作进行简单的机载计算，而无需解决机载与CubeSats不兼容的复杂且计算量大的时间最优解。开环控制阶段之后是精确的闭环阶段，将航天器准确指向目标方向。该策略通过数值仿真（包括相对于系统不确定性的鲁棒性）通过蒙特卡洛分析进行了验证。 （C）2017年美国土木工程师学会。

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  • 来源
    《Journal of aerospace engineering》 |2017年第5期|04017057.1-04017057.14|共14页
  • 作者

    Grossi Armando; Piergentili Fabrizio; Santoni Fabio;

  • 作者单位

    Univ Roma La Sapienza, Fac Civil & Ind Engn, I-00184 Rome, Italy;

    Univ Roma La Sapienza, Dipartimento Ingn Meccan & Aerosp, Via Eudossiana 18, I-00184 Rome, Italy;

    Univ Roma La Sapienza, Dipartimento Ingn Astronaut Elettr & Energet, Via Eudossiana 18, I-00184 Rome, Italy;

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