多源信息融合卫星组合导航系统的可观度分析

The integrated navigation system is analyzed by using system observability analysis method and state observability analysis method respectively for the multi-source information fusion of high orbit satellite integrated navigation system based on GNSS satellite, landmarks vectors and star-lights vectors. The simulation results show that landmarks vectors and star-lights vectors can effectively provide measurement information and ensure the stability of the filter when GNSS navigation satellites are not visible. The observability analysis results show that system observability is mainly affected by the visibility of GNSS navigation star, and the introduction of landmark vectors and starlight vectors is helpful to improve the observability. The state-based observability can roughly reflect the filtering precision.