초록(영문)
Multi-robot exploration problem is generally constituted of a determination of next-best-views (NBVs), path planning, and
coordination algorithm. This paper presents a unified 3D multi-robot exploration algorithm in order to solve the inefficiency that takes
place when the aforementioned three components are constructed individually. The proposed algorithm is composed of two parts: an
allocation of exploration regions and a determination of the best path. For the allocation of the region to explore, each robot generates a
sampling-based tree, e.g. RRT, which composes a Voronoi-biased forest (VBF). A VBF, a new data structure introduced within this work,
assigns a region for each robot to explore in a probabilistic manner. The amount of the space a VBF covers is quantitatively analyzed
depending on its parameters. From the generated VBF, each robot determines the best path from branches of its tree based on the amount
of information can be gained along with the paths of peer robots. Only the first edge of the best branch of each tree is executed in a
receding horizon scheme. The overall exploration algorithm is evaluated in a computer simulated environment. The results demonstrate
that our coordination algorithm allows robots to quickly and reliably explore the environment.