Autonomous navigation of the Mars approach based orbiters radiometric measurement

In this paper, an autonomous navigation method for the approaching segment of the Mars exploration mission based on the radio measurement of the Mars orbiter is studied. The method uses the Mars orbiter as a radio beacon, and obtains observation data by measuring the relative distance and radial velocity of the rover and each orbiter. The continuous unscented Kalman filter and sensor fusion is adopt to solve for the observation occlusion problem between the orbiter and the rover. The observability of this navigation mode is also analyzed, and the influence of orbiters' parameters on the observability of the navigation method is discussed. Finally, we carried out the simulation analysis of the navigation scheme, and the results indicates the effectiveness of this navigation method.