GNC schemes design for future China asteroid exploration

Asteroid exploration activities deepen the current understanding about the solar system evolution process and space resource. In the U.S., European, and Japanese space agencies, missions sending spacecraft to explore asteroids currently exist, obtaining a lot of scientific data. China has not formally implemented asteroid exploration mission, except for China´s second lunar probe Chang´e-2 flyby and exploring the asteroid 4179 Toutatis. In this paper, we will report a new candidate scenario for future China asteroid exploration and innovative navigation, guidance and control schemes. In order to overcome the defect of traditional IMU based navigation, we develop the new multi-information fusion integrated navigation based on optical for accompany flight and landing asteroid. External navigation observation information from line-of-sight measurement and vector measurement are included in the integrated navigation schemes to improve the navigation accuracy. At the same time, autonomous guidance schemes are proposed to support accompany flight and safe landing an asteroid with larger irregularity of gravity field.