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This study uses a wheeled mobile robot to explore unknown indoor environment and build up a map of the unknown environment. The robot utilizes ultrasonic and infrared sensors with indoor positioning system to detect obstacles and identify unknown environment. Fuzzy system and sensor fusionare applied to control design. The proposed scheme can control the wheeled mobile robot move along walls and avoid obstacles. Angle and distance of the wheeled mobile robot are used to obtain the path trajectory. With sensed data of obstructions and walls, a map of unknown environment can be generated by curve fitting methods. The map building scheme is tested in different terrains and the experiments confirm that the proposed scheme works properly. Keywords-sensor fusion; fuzzy system; mobile robot; map building

Fuzzy Sensor Fusion and Curve Approximation for indoor Map Building