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为验证GNSS旁瓣信号对中高轨航天器在轨飞行的导航支持能力,“嫦娥5号”飞行试验器搭载了GPS导航接收机。由于目前使用的星载导航解平稳性不够,为此,根据月球探测器不同飞行段落轨道动力学特性,建立了一种基于星载GPS数据的月球探测器实时导航算法。该算法充分考虑了月球探测器不同段落的动力学特性,基于UKF滤波设计,并引入了自适应策略,以降低滤波参数选取的难度。在分析星载GPS数据特点基础上,月地返回段实测数据的处理结果验证了算法的可行性和有效性。
In order to verify the navigation support ability of GNSS side lobe signals on orbit flight of medium and high-altitude orbit spacecraft, the Chang’e-5 Flight Tester is equipped with a GPS navigation receiver. Due to the insufficient smoothness of the satellite navigation system currently used, a lunar probe real-time navigation algorithm based on spaceborne GPS data is established according to the orbital dynamics of different lunar rover flight segments. The algorithm takes full account of the dynamic characteristics of different sections of lunar probe, based on the UKF filter design, and introduces an adaptive strategy to reduce the difficulty of selecting filter parameters. Based on the analysis of the characteristics of on-board GPS data, the processing results of the measured data in the moon’s return section verify the feasibility and effectiveness of the algorithm.