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首页> 外文期刊>Advances in space research >Precise attitude rate estimation using star images obtained by mission telescope for satellite missions
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Precise attitude rate estimation using star images obtained by mission telescope for satellite missions

机译：使用任务望远镜获得的用于卫星任务的星图精确估算姿态速率

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摘要

Recently, small satellites have been employed in various satellite missions such as astronomical observation and remote sensing. During these missions, the attitudes of small satellites should be stabilized to a higher accuracy to obtain accurate science data and images. To achieve precise attitude stabilization, these small satellites should estimate their attitude rate under the strict constraints of mass, space, and cost. This research presents a new method for small satellites to precisely estimate angular rate using star blurred images by employing a mission telescope to achieve precise attitude stabilization. In this method, the angular velocity is estimated by assessing the quality of a star image, based on how blurred it appears to be. Because the proposed method utilizes existing mission devices, a satellite does not require additional precise rate sensors, which makes it easier to achieve precise stabilization given the strict constraints possessed by small satellites. The research studied the relationship between estimation accuracy and parameters used to achieve an attitude rate estimation, which has a precision greater than 1 × 10~(-6) rad/s. The method can be applied to all attitude sensors, which use optics systems such as sun sensors and star trackers (STTs). Finally, the method is applied to the nano astrometry satellite Nano-JASMINE, and we investigate the problems that are expected to arise with real small satellites by performing numerical simulations.
机译：最近，小型卫星已用于各种卫星任务，如天文观测和遥感。在执行这些任务期间，应将小型卫星的姿态稳定到更高的精度，以获得准确的科学数据和图像。为了实现精确的姿态稳定，这些小型卫星应在质量，空间和成本的严格约束下估算其姿态速率。这项研究提出了一种新的方法，可以通过使用任务望远镜来实现精确的姿态稳定，从而使用星模糊图像来精确估计小型卫星的角速率。在这种方法中，基于星像的模糊程度，通过评估星像的质量来估算角速度。因为所提出的方法利用了现有的任务设备，所以卫星不需要额外的精确速率传感器，考虑到小卫星所具有的严格限制，这使得更容易实现精确的稳定。该研究研究了估计精度与用于完成姿态率估计的参数之间的关系，该精度具有大于1×10〜（-6）rad / s的精度。该方法可以应用于所有使用光学系统的姿态传感器，例如太阳传感器和恒星跟踪器（STT）。最后，该方法被应用于纳米天文卫星Nano-JASMINE，并且我们通过进行数值模拟来研究预期在实际的小型卫星中会出现的问题。

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