地月空间探测器星间测距自主定轨
Abstract
<p indent="0mm">The navigation, positioning, and timing in the Earth-Moon space are inseparable from the precise orbit information of a spacecraft. At present, the precise orbit determination of a probe still mainly depends on ground-based measurement, including ground-based ranging, Doppler and interferometry. Inter-Satellite Link measurements have been fully applied in Beidou and other satellite navigation systems, with high accuracy measurements and easy implementation. Because of the gravitational symmetry, a spacecraft near the Earth cannot achieve autonomous navigation by only using Inter-Satellite Link data. However, several gravitational asymmetric regions are found in the Earth-Moon space, which can achieve autonomous navigation and high-precision orbit determination solutions based on Inter-Satellite Link data. The data processing algorithm is deduced. Considering typical orbits in the Earth-Moon space, different application scenarios are designed, and the orbit determination accuracy is analyzed using simulation data. The analysis results show that gravity asymmetry and orbit dynamics constraints are important factors affecting the orbit determination accuracy of probes orbiting the Earth-Moon libration points. The simulation results also indicated that the orbit determination accuracy can be better than <sc>10 m</sc> with <sc>1 m</sc> noise in the data.</p>
