Observability analysis of deep space autonomous navigation system

This paper studied the observability analysis of deep space autonomous navigation. The paper built the observation models of autonomous navigation and presented the observability analysis method of autonomous navigation system based on the position determination analysis and the observability rank condition. The method can overcome the observability analysis difficulty of autonomous navigation for LOS vector, LOS angles, separation angles and images and such nonlinear measurements. For the difficulty of determining directly its rank by using the maths expression of observation matrix, the observability analysis method of autonomous navigation system based on the singular value decomposition of observability matrix was given and was used to analyze the observability of navigation system corresponding to some observation modes and the observability degree of orbit parameters. These can provide the reference the combination of various sensors in the different orbit phases to improve the estimation precision of orbit.