Abstract
In small body landing missions, the nominal landing scheme may turn out to be inapplicable in reality due to the limited prior information of the target and possible system errors after long-term operation. In this paper, a partial breakdown of the main thruster in the presence of large state deviations and complex terrain conditions at the landing site is considered. In order to ensure lander safety, a risk-precautionary landing strategy that identifies landing anomalies, generates onboard warnings, and plans an emergency transfer is proposed. First, lander safety is repetitively evaluated during descent through a computation of onboard deceleration capability and landing site safety. Upon a predicted landing risk, an emergency mode is activated. Three emergency modes are developed for the strategy, including an orbiting mode, a diverting mode, and a hovering mode. For each mode, a customized goal state is designated and a corresponding emergency transfer trajectory is generated in real-time. At last, an asteroid 433 Eros-based landing scenario is designed, and the effectiveness of the strategy is verified under three different thruster and terrain conditions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
