In this paper, we consider the problem of sharing knowledge in multi-robot exploration. Recently, Some research works of multi-robot exploration have studied. However, in traditional research works, it is very difficult to share each robot's knowledge of explored area. We use the belief measure as the expression of sensing information in each robot for exploring an unknown environment. Then, multiple robots share the knowledge of the environment considering the degree of trust for other robots. The effectiveness of our approach is demonstrated by a real experiment for the case of two mobile robots.
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