1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, China
2. Unmanned System Research Institution, Northwestern Polytechnical University, Xi'an, China
3. Science, Mathematics and Technology Cluster, Singapore University of Technology and Design, Singapore
4. School of Software, Northwestern Polytechnical University, Xi'an, China
5. School of Computer Science and Engineering, South China University of Technology, Guangzhou, China