1. General Robotics, Automation, Sensing and Perception Laboratory, University of Pennsylvania, Philadelphia, PA, USA
2. Department of Mechanical Engineering, Northwestern University, Evanston, IL, USA
3. Monash University, Clayton, VIC, Australia
4. Northrop Grumman Corporation, Linthicum Heights, MD, USA
5. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN, USA