一种基于星载GPS的月球探测器导航算法

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。

Navigation Algorithm for Lunar Probe Based on Satellite-Borne GPS Data

To validate the navigation ability for high orbit spacecraft by side-lobe echo of GNSS, GPS receiver was fitted to the Chang''e-5 test vehicle. However, the system has not obtained an anticipant stationary position results. Therefore, a real-time navigation algorithm for lunar probe by satellite-borne GPS is suggested. The algorithm is developed by several UKF filter design according to different dynamic characters of the reentry test orbit. Adaptive technique is also introduced for filter switching and parameter selection. After the analysis of satellite-borne GPS, actual data from the circumlunar return of Chang''e-5 test vehicle is utilized for validating the feasibility and effectiveness of the algorithm.