In this paper the design and simulation are presented for THROO: Tracked Hybrid Rover for Overpassing Obstacles. The proposed mobile robot has 3-DOFs and it is capable of straight motion, turning ability and two operations, namely rover-like motion with tracks on flat terrain and walking-like motion with legs to overpass obstacles on uneven terrain. A prototype has been built and the reported experimental results show its ability in overpass obstacles, which size is comparable or greater than the track high.
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