Funding for this research was provided by:
the National Natural Science Foundation of China (11372150)
the State Key Laboratory of Astronautic Dynamics Foundation (2016ADL-0202)
the National Science Foundation for Distinguished Young Scholars (11525208)
the National Nature Science Foundation of China (11572166)
Article History
Received: 1 December 2015
Accepted: 22 November 2016
First Online: 24 November 2016
Free to read: This content has been made available to all.