太阳帆-绳系航天器构建天基日食的姿轨动力学及状态保持控制研究

日冕是太阳的上层大气，是太阳风起源和太阳风暴发生的关键区域，日冕观测是监视太阳爆发的重要途径。日冕仪受杂散光影响、尺寸限制，图像质量无法与日全食期间拍摄图像相媲美，且难以获得低层和高层日冕。日食是日冕光学观测的最有利环境，然而地球上日食观测机会有限，若能在宇宙空间构建飞行轨道，使得航天器长期处于日食环境，将能极大的促进日冕精细观测、太阳风起源研究。.地球本影末端点是天然的天基日食观测点。然而，受限于太阳能源获取、日-地引力不平衡，航天器难以长期在此停留。本项目提出太阳帆-绳系航天器概念，利用太阳帆航天器在地球半影区获取电能及太阳光压力，通过系绳将电能传输至本影末端点的日冕观测航天器，并由系绳张力来平衡观测航天器的引力不平衡。针对此概念，开展太阳帆-系绳航天器这一新构型的动力学建模、观测构型的平衡点求解、平衡点稳定性及状态保持控制研究，为将来的航天器系统工程提供技术储备。

The corona is the upper atmosphere of the sun, which is the key area for the research of origin of solar wind and the solar storms. Due to the influence of stray light and limitation of corona-meter size, the image resolution is far lower than that taken during total solar eclipse. What's more, it is difficult to obtain the low and high corona. Solar eclipse is the most favorable environment for optical observation of the corona. However, the opportunity for solar eclipse observation on earth is rare. If we can construct a spacecraft trajectory in space and keep it in the eclipse environment for a long time, it will greatly promote the fine observation of the corona and the study of the origin of solar wind..The terminal point of the earth's umbra is a natural space-based solar eclipse observation point. However, due to the limitation of solar energy acquisition and the imbalance of sun-Earth gravity, it is difficult for spacecraft to stay here long. The concept of solar sail-tethered spacecraft is proposed in this project. The solar sail spacecraft is used to obtain electric energy and solar light pressure in the penumbra region, and the electric energy is transmitted to the coronal observation spacecraft at the end of the umbra through the tether, and the gravitational imbalance of the observation spacecraft is balanced by the tether tension. Based on this concept, the dynamic modeling of solar sail-tethered spacecraft, the equilibrium point of the observation configuration, the stability of the equilibrium point and the state-keeping control are carried out to provide technical support for the future development of spacecraft system engineering.